Gas boiler Buderus 24 double-circuit error 3s. Buderus boiler errors and their codes

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Errors and malfunctions of gas boilers Buderus

Buderus boiler error codes

A - The machine is in "chimney sweep" mode. After 15 minutes, the "chimney sweep" mode is automatically deactivated

H - The Buderus boiler is in heating mode.

(=) H - Appliance in DHW mode

0A - Cyclic blocking active: the delay time between switching off and switching on the burner has not yet expired (service function 2.3b).

0A - Keep warm duration for GB072-24K: Keep warm time interval has not yet expired (service function 2.3F).

0C - Burner turns on

0E - The heat demand is less than the minimum heat output of the boiler. The boiler operates in on-off mode.

0H - The device is in the ready state, there is no need for heat.

0L - Gas valve opens, first delay time.

0U - The boiler starts up.

0Y - The actual flow temperature is higher than the set one. The boiler is switched off.

2E - Error: Ventilation function is active.

2H - Anti-jamming protection for the heating circuit pump and three-way valve is active.

2P - Gradient limitation: temperature increase too fast in domestic hot water mode.

5H - Boiler test by control system

H11 - Damage to the DHW temperature sensor (GB072-24K)

Remove temperature sensor.

Check the connecting cable for breaks and short circuits, replace if damaged.

0Y - The temperature at the flow sensor is more than 95 C.

This message may appear in the absence of a malfunction, if all the valves on the radiators suddenly close or after sampling hot water for GB072-24K.




Check for damage or short circuit in the flow temperature sensor and its wires, replace if necessary.

0Y - High temperature on the hot water temperature sensor

Check the correct position of the sensor.
Check it and if it is defective, replace it
Insert KIM correctly, replace if necessary

2P - Limitation of gradients: temperature increase too fast in heating mode

Check the operating pressure in the heating system. Open service taps.
Complete electrical connection heating circuit pump to the main controller BC20.
Check or replace the heating circuit pump.
Correctly set the pump power or its characteristic and adjust to the maximum power.

3A - The fan does not work. Check it and if it is defective, replace it

3F - The burner and fan have been running for 24 hours without interruption and turn off for a short time for security.

4C - The heat exchanger temperature limiter or the flue gas temperature limiter of the Buderus boiler has tripped. If a blocking fault exists for a long time, then it passes into the locking one.

4U - Faulty flow temperature sensor (short circuit). If the fault exists for a long time, the display will show fault code 4U and operation code 222

4Y - Faulty flow temperature sensor (break). If the fault exists for a long time, the display will show fault code 4Y and operating code 223

6A - No flame detected. After the 4th ignition attempt, the blocking fault turns into a locking one.

6L - No ionization signal during burner operation. The burner restarts. If the ignition fails, a blocking error 6A will be shown, after the 4th ignition attempt, the blocking fault goes into a fault

8Y - The AT90 temperature control relay has tripped. Check the adjustment of the temperature control relay AT90. Check the heating control setting.

8Y - Faulty temperature control relay AT90. Check for damage or short circuit in the temperature sensor and its wire, replace if necessary.

8Y - There is no jumper between the terminals of the separate AT90 temperature control relay.
If a temperature control relay is not connected, install a jumper

8Y - Temperature control relay blocked
Unlock the temperature control relay. Check the condensate drain.
Condensate pump not working - Replace condensate pump.

EL - Faulty main regulator BC20 - Replace

3C - Fan operation error. Check the fan and its cable with plug, replace if necessary.

3L - The fan has turned off during the delay time. Check and, if necessary, replace.

3P - The fan is running too slowly. Check and, if necessary, replace.

3Y - The fan is running too fast. Check and, if necessary, replace. Check the flue gas system, clean or repair if necessary.

4C - Error of the heat exchanger temperature limiter or flue gas temperature limiter.
Check: for damage to the heat exchanger / flue gas temperature limiter and its connecting cable, replace if necessary, operating pressure in the heating system, temperature limiter, replace if necessary, pump head, replace pump if necessary, fuse, replace if necessary.
Remove air from the boiler. Check the water circuit of the heat exchanger, replace if necessary.
For Buderus boilers with a divider in the heat exchanger, check whether the divider is installed.

4U - Faulty flow temperature sensor (short circuit). Check for damage or short circuit in the temperature sensor and its wire, replace if necessary.

4Y - Faulty flow temperature sensor (break). Check for damage or breakage of the temperature sensor and its wire, replace if necessary.

6A - Error: Flame not found.
Check: protective conductor connection, whether the gas cock is open, gas supply pressure, electrical connection, electrodes with wires, flue gas system, clean or repair if necessary. Check the gas-air ratio, correct if necessary. For natural gas: check gas flow switch, replace if necessary. When working with combustion air intake from a room, check the air supply to the room and the ventilation openings.
Clean the drain of the condensate siphon. Remove the membrane in the fan mixing device, check for cracks and dirt on it. Clean the heat exchanger of the Buderus boiler.
Check gas fittings, replace if necessary. Insert KIM correctly, replace if necessary. Two-phase network (IT): install a resistance of 2 ohms between PE and N on the connection of the electronic board to the mains.

6C - In shutdown mode, the boiler registers a flame.
Check the contamination of the electrodes, replace if necessary.

Check the moisture content of the electronic board, dry if necessary.

6C - Flame detected after shutting off gas supply.
Check gas fittings, replace if necessary. Clean the condensate siphon.
Check electrodes and connecting wires, replace if necessary.
Check the flue gas system, clean or repair if necessary.

7L - Time error at the first delay time. Replace BC20 main regulator.

7L - Time error when trying to restart. Replace BC20 main regulator.

9L - Defective coil or connecting wire of the gas valve

9L - Faulty gas valve
Check wires, replace if necessary. Replace gas valve.

9P - KIM is not recognized. Insert KIM correctly, replace if necessary.

EL - Faulty KIM or main regulator BC20. Replace KIM. Replace BC20 main regulator.

Malfunctions of Buderus boilers

1. The burner does not turn on

The emergency switch of the heating system is in the Off - On position.
Start switch of the control system in the Off - Enable position.
Faulty circuit breakers - Check their functionality, if necessary, replace the defective circuit breaker. Boiler temperature controller damaged - Check and, if necessary, replace defective parts. Safety temperature limiter damaged - Check and, if necessary, replace defective parts.

Error message from external safety devices (e.g. safety device water level control) - The consumer must check the Buderus boiler, eliminate the malfunction and, if necessary, replace the element

The flue gas control system has been triggered - AW 10: Reset the flue gas control system. AW 50: Wait a maximum of 15 minutes. The boiler will turn on automatically if there is a demand for heat. If triggered repeatedly, check the flue gas path and check the function of the flue gas monitoring system. If there is a defect, then replace.

2. Burner starts and switches to fault. No spark on ignition.

Is there a sound when an ignition spark is generated with the ignition cable removed? - If not, then: replace the ignition transformer. If so, replace the ignition electrode or ignition burner.

3. Burner starts and switches to fault.

All gas shut-off valves are closed - Open the gas shut-off valves.
Natural gas supply pressure greater than 8 mbar - If not, then: find the cause and rectify the fault. Has air been removed from the pipeline? - Remove air until the gas can be ignited.

4. Buderus boiler burner starts and switches to fault. No ionization current.

If connections N and L are reversed - Eliminate the error.
Is there voltage between L and PE? - If not, then: Ground the PE, in this case install an isolating transformer. Poor contact of the ionization wire - Eliminate the error, in this case, replace the defective part. Short to ground on the ionization electrode - Repair the damage. Burner control defective - Replace element.

5. Burner starts and switches to fault. Ionization current less than 1.5 mA.

The core or ceramic of the ionization electrode is dirty - Clean the ionization electrode, if necessary replace the ignition burner.

6. Boiling sounds

Lime deposits or scale build-up in the boiler - Clean the water circuit of the boiler according to the manufacturer's recommendations. With constant loss of water, determine and eliminate the cause. If required, carry out water treatment and install a dirt trap.

Buderus Logamatic control system

Logamatic 2107 modes and operating parameters

By turning the rotary selector it is possible to display the measured values ​​from all connected temperature sensors as well as the operating hours of the burner.

The following parameters will be displayed in sequence:

Boiler water temperature.
- Hot water temperature.
- Outside temperature (current value, excluding building insulation).
- Flow temperature, heating circuit 2 (if mixer module FM 241 is present).
- Solar collector temperature (if solar module FM 244 is present).
- Hot water temperature from the solar collector (if there is a solar module FM 244).
- Room temperature, heating circuit 1 (if a remote control is connected).
- Room temperature, heating circuit 2 (if a remote control is connected).
- Flue gas temperature (if a flue gas temperature sensor is connected).
- Burner operating hours.
- Operating hours of the 2nd stage burner (if the 2nd stage module FM 242 is present).
- Operating hours of the solar collector pump (if there is a solar collector module FM 244).

The buttons on the Buderus Logamatic 2107 control system have the same functions as the buttons on the remote control. On the remote control, you can set the operating mode for heating circuits that are equipped with such a remote control. Buttons for setting the operating mode to
the control system is then left "without functions", although the LEDs will show the set mode.

If there are two heating circuits, the operating mode buttons and LEDs work:

For both heating circuits at the same time, if no remote control is installed,
- for a heating circuit without remote control, if a remote control is installed on another heating circuit,
- for none of the heating circuits, if remote controls are installed for two circuits (the LEDs then show the operating mode of the last heating circuit or domestic hot water circuit that was serviced).

On the control system, you can set: automatic mode / manual mode.

Auto mode

The heating system operates according to the heating program preset at the factory. This means that the house will be heated and hot water will be prepared at a certain time. Normally, at night, the heating operates at a lower temperature than during the day.

With the Buderus Logamatic 2107 control system, there is no need to close the thermostatic regulators every evening and open them again in the morning. Switching between normal (day) mode and setback mode (night mode) occurs automatically.

The time at which the heating system switches from normal (day) mode to setback mode (night mode) is factory set in the standard program. If desired, this setting can be changed by you or the heating system operator.

Manual mode

If, for example, you want the heating to run longer in the evening and turn on later in the morning, you must manually select the normal (day) heating mode or the reduced temperature mode (night mode). The selected operating mode will work continuously.

Automatic mode selection

Together with the green LED above the "AUT" button, the LED above the "Day mode" or " Night mode" - depending on which heating mode is currently on. The change from normal mode to low temperature mode occurs automatically at the time set in the program.

If there are two heating circuits and only one of them has a remote control, then the LED display on the control unit is valid for the heating circuit without remote control. Press "AUT" button to select auto mode. The heating system works according to the heating program preset at the factory, which means that the house will be heated and hot water will be prepared at a certain time.

Operating modes Buderus Logamatic 4211

Setting the room temperature for other heating circuits

The heating system can operate with several circuits. If you want to change the room temperature for a heating circuit other than the last selected one, the desired circuit is selected first.

Depending on the equipment of the heating system, the following circuits can be selected:

– MEC OUT.LOOP
– HEATING CIRCUIT 0 – 8

If several heating circuits are assigned to MEC2, they can only be controlled together. Otherwise, the error message "SETTING IMPOSSIBLE MEC FROM LOOP SELECT" appears. In this case, select "MEC FROM. LOOP."

Open the lid. Hold down the "heating circuit" button and select the required circuit with the rotary selector. Release the "heating circuit" button. The displayed heating circuit is selected. As soon as a heating circuit is selected, the screen switches to a permanent display. Keep the "Temperature" button pressed. First, the heating circuit appears, for which the temperature is to be set.

After about 2 seconds, the screen will show the current set temperature and operating mode. On the Buderus Logamatic 4211 control unit, set the desired temperature (here: "21C") for the heating circuit. Release the button to save the entered value. Now daytime
room temperature is set to 21C. After that, a permanent indication will appear.

Heating circuits with MEC2 control panel

During installation, the heating company's specialists specify which heating circuits are to be controlled from the MEC2 control unit. These heating circuits are called "MEC FROM. CIRCUIT."

The following settings are made on the MEC2 simultaneously for all MEC heating circuits:

– room temperature setting.
– summer/winter changeover setting.
– selection of the operating mode.
– Activate the vacation function.
– Activate the break function.

If one heating circuit assigned to MEC2 is selected and then one of the above settings is made, the error message "SETTING IMPOSSIBLE MEC FROM CIRCUIT SEL" appears. Select "MEC FROM. LOOP." to program these settings.

Individual heating circuits

The following control settings can only be made separately for each heating circuit:

– selection of the standard program.
– changing the standard program by shifting the switching points.
– adding or deleting switching points.
– merging or deleting heating periods.
– Creation of new programs for heating, DHW or circulation pump.

If "MEC OUT. LOOP" is selected and then one of the above settings is performed, the error message "HEBO3 TIMER OUT. OUT. LOOP SEL" appears. Program these settings separately for each heating circuit.

Setting the circulation mode for the Buderus Logamatic 4211

The circulation pump provides an almost immediate supply of hot water to the taps. To do this, twice an hour, the circulation pump is switched on for three minutes and supplies hot water through a separate circulation line.

This interval can be changed by the heating contractor at the service level.

The circulation mode can be changed as follows:

Open the lid.
Hold down the "heating circuit" button and turn the dial to "CIRCULATION".
Release the "heating circuit" button.
The permanent display reappears on the screen.

Select one of the following operating modes for the circulation pump:

"DC LOAD"
The circulation pump operates independently of the heating circuits at a set interval.
Press the "Day mode" button to select the permanent operation mode.

"MACHINE."
The circulation starts at a set interval 30 minutes before the first heating circuit is switched on and stops when the last heating circuit is switched off (factory setting).
You can also enter your own program for the circulation pump.
Press the "AUT" button to select automatic mode.
After about 3 seconds, the permanent display will reappear on the screen.

"WHEN LOADING HW"
The circulation pump does not turn on.
By pressing the "Hot water" button, the circulation pump will turn on only for the duration of a single load.
Press the "Night mode" button to turn off the circulation.
After about 3 seconds, the permanent display will reappear on the screen.

Fault indication Buderus Logamatic

Strategic flow sensor

All available steps are required.
System flow sensor not connected, connected incorrectly or defective.

Check the connection of the flow sensor.
Replace system flow sensor or FM 447 module.

Outside temperature sensor

Transmits the minimum outside temperature.
Outside temperature sensor incorrectly connected or defective, e.g. not connected to the controller with address 1 in a multi-boiler system.

Interrupted communication with control system with address 1.
Check if the outside temperature sensor is connected to desired system management.
Check communication with address 1.
Replace outside temperature sensor or boiler module ZM 432.

Flow sensor 1-8

The mixer is fully open.
If an actuator/mixer has been selected in MEC 2, the control system requests the corresponding flow sensor. Faulty FM 441/FM 442 module or control system. Check sensor connection.
If the faulty heating circuit is to be operated as a circuit without mixer, then check whether MEC 2 / Service level / Heating circuit - Actuator is set to "no".
Replace FM 441/FM 442 module.

Hot water sensor

There is no water heating. Sensor not connected, connected incorrectly or defective.

Check sensor connection. Replace sensor or FM 441 module.

The water stays cold

Constant attempts to load the storage tank at low boiler flow temperature.

The sensor is incorrectly connected or defective. The sensor is incorrectly positioned.
Loading pump incorrectly connected or defective.
Faulty FM 441 module or control system.

Check the operation of the sensor and the loading pump. Replace FM 441 module.
Check the location of the sensor on the water heater tank.

Thermal disinfection

Thermal disinfection interrupted.
The heating output of the boiler is not enough, because, for example, during thermal disinfection, there is a request for heat from other consumers (heating circuits).
The sensor is incorrectly connected or defective. Loading pump incorrectly connected or defective.
Faulty FM 441 module or control system.
Choose to perform thermal disinfection at a time when there is no additional demand for heat from the consumers. Check the operation of the sensor and the loading pump and, if necessary, replace them. Replace FM 441 module.

Remote control 1-8

Since the actual temperature in the room is not measured, the programs for temperature correction, on-off optimization and auto do not work. adaptation.
The control system works according to the last parameters set on the remote control.
Remote control connected incorrectly or defective.
Check the operation/connection of the remote control. In this case, the addressing of the remote control must be checked. Replace remote control/function module.

Communication with the heating circuit OK 1-8

Incorrect remote control addressing.
Remote control wired incorrectly.
Remote control defective. Faulty control system.
Check the operation/connection of the remote control.
Replace remote control/function module.

Boiler connection 2-3

Boiler stages 2 or 3 are requested.
The control system with address 2 or 3 was not found on CAN-BUS, although it is set in MEC 2 in the Strategy menu.
FM 447 policy module or control system defective.
Check the addressing of the control systems. Check connection to CAN-BUS.
Wrong strategy setting on MEC 2, check the number of boilers.
Replace strategy module FM 447.

Boiler water temperature sensor

The boiler is operating at maximum power.
Available emergency mode work through the temperature controller.


Replace boiler water temperature sensor or boiler module ZM 432.

Additional boiler sensor

Mixers open fully. Ecostream regulation not possible.

Sensor not connected, connected incorrectly or defective.
Boiler module ZM 432 or control system defective. Check sensor connection.
Replace additional boiler sensor or boiler module ZM 432.

The boiler is cold

Boiler protection (antifreeze and condensate protection) cannot be guaranteed.
The boiler turns on at maximum power.
The temperature control or switch is not set to the "AUT" position.
No fuel supply. The sensor is incorrectly positioned.
Boiler water temperature sensor defective.
Check that the temperature controller or switch is set to the "AUT" position.
Check the presence and supply of fuel. Check sensor location.
Replace the boiler water temperature sensor.

Burner

Boiler protection (frost protection) cannot be guaranteed. No hot water.
The burner is defective and therefore a 230 V fault signal is sent to terminal BR 9.
Boiler module ZM 432 or control system defective.
Eliminate the fault in accordance with the instructions in the documentation for the heating boiler or burner.
Check the fault signal from the burner to terminal BR 9 (230 V).
If there is a signal: check the operation of the burner. If there is no signal: replace the ZM 432 module.

Safety chain

Boiler protection (frost protection) cannot be guaranteed.
The safety temperature limiter STB has tripped.
Faulty control system.
Find the cause of the STB triggering and then unlock the STB by pressing the jamming button.
Check if an external STB is connected.

Boiler external interference (KS)

Fault input of the boiler module ZM 432 is connected incorrectly.
External components are faulty or defective.
Check operation of external components and, if necessary, repair/replace them.

flue gas sensor

It is not possible to find the boundary flue gas temperature.
The sensor is not connected or connected incorrectly.
The sensor or control system is defective.
Check sensor connection.

Flue gas boundary

No response to regulation. There is a lot of soot in the boiler.
Flue gas sensor defective.
The boiler needs to be cleaned.
Check the connection and operation of the sensor.

External pump interference 1-8

No response to regulation.
Fault input WF 1/2 of the FM 441/FM 442 function module is open.
The externally connected heating circuit pump is defective or defective.
Check the function of the connected heating circuit pump.
Replace the corresponding module.

ECO-BUS reception

No response to regulation. Incorrect addressing of the coding switch located behind the MEC 2 in the controller module CM 431 of the control system.
Error example: Installation with control system and coding switch position greater than 0.
Check the setting of the coding switch:
Position 0: There is only one bus member.
Position 1: Master control system (other BUS participants are expected!).
Position greater than 0: other bus participants.

Supply line configuration

The operating conditions of the boiler cannot be maintained.
When configuring the flow line (Strategy), different types of boilers were specified.
With Ecostream control via heating circuit actuators, all boilers must have the same settings.

No Master

Boiler protection cannot be guaranteed.
Priority DHW heating is not possible.
The minimum outside temperature is taken into account.
Main system master control (address 1) is switched off or there is no control system with address 1.
Check the addresses of the bus participants. The master control system must have address 1.
Check bus connection to address 1.

Return line sensor

Return temperature control not possible.
Sensor not connected, connected incorrectly or defective.
The sensor or control system is defective. Check sensor connection.

inert anode

There is no impact. There is voltage at the external input WF 1/2.
The module or control system is defective. Replace inert anode.
Replace the FM 441 module in the control system.

05.11.2017

Buderus boiler error 6a

Wall-mounted gas boilers Buderus

Buderus has been part of the Bosch Group since 2003. Wall-mounted boilers of this brand are represented by three model series Logamax U072, Logamax U052 and Logamax U044.

The company provides a wide range of boilers of various technical equipment.

The series and model of the boiler is usually indicated on a special plate, which is located on the boiler. For example, Logamax U072 - 24K stands for:

U - gas heater with circulation pump

0 - premix gas burner

7 – boiler series

2 - type of combustion chamber (2 - closed, 4 - open)

24 - rated power of the boiler

K - double-circuit model

If problems occur, this information will be useful in diagnosing the nature of the problem.

The seventh series of Logamax U072 boilers is represented by the widest model range in the power range from 12 to 35 kilowatts. Boilers of this series are widely used for apartment heating and heating of small private houses.

Distinctive features:

low noise level - the boilers really work very quietly

variable speed fan

stylish design and convenient management

Boiler with modern technical equipment, compact size and affordable price.

Boiler Buderus malfunction

Like any other wall-mounted boiler, Buderus is equipped with a protection system and in the event of an emergency situation, work will be stopped and the user will receive an error message that indicates in which system of the unit the malfunction occurred.

Some devices are equipped with a liquid crystal display, and the user will see an error code. If the boiler is not equipped with a display, the fault will be indicated by flashing the temperature indicators. For example, if the temperature indicator 80 flashes, this means a 3C error that would appear on a similar boiler with a display.

A complete list of error codes reflected by blinking indicators can be viewed in the figure. Next, consider the most common errors and recommendations for their elimination.

Boiler Buderus error 6a

Error buderus 6a (second indicator flashes) occurs when the boiler does not detect a flame on the burner. Flame control is one of the essential functions security systems. To control the flame, there is a special electrode on the burner through which a small current flows during combustion. The control board constantly captures this current. If for some reason the current on the ionization electrode disappears, error 6a occurs. The same thing will happen, for example, after several failed attempts ignition of the boiler is the most common situation.

The reasons are standard for all boilers:

incorrect adjustment of the gas valve (insufficient network gas pressure)

poor contact or no signal from the flame ionization sensor

flame control sensor malfunction (dirty, broken)

failure of the control board (required)

incorrect electrical connection of the boiler (lack of grounding)

lack of air for proper combustion (lack of draft, clogging of the intake pipe)

The buderus 6a error is classified as critical, which means that after the occurrence of such a malfunction, the boiler will not start on its own - the error must be reset!

There are two options for resetting the error:

keep the OK button pressed until the fault signs disappear, the boiler starts working again and the display shows the flow temperature.

Turn the boiler on and off

Buderus boiler error 6a how to fix

First of all, you need to exclude the accidental occurrence of an error and simply reset it. If the error occurs again and the boiler does not start, then the problem needs to be addressed. The ignition problem in most cases can only be fixed by a qualified technician. The simplest thing to do is to inspect the combustion chamber and electrodes for contamination and clean if necessary.

If the boiler makes unsuccessful attempts to ignite, visually check that the spark breaks through the burner, and not somewhere else. If a crackling sound is heard, but there is no spark between the electrode and the burner, the electrode insulation is probably damaged somewhere and it needs to be replaced.

The adjustment of the gas valve may only be carried out by a specialist. Checking for proper mains gas pressure can be done via gas stove. If you light all the burners on the stove at the same time, they should work without interruption. If this is not the case, it can be assumed that the incoming pressure is not enough and you need to call the gas service.

In our practice, there was a case when a crack in the viewing window of the combustion chamber was the cause of the malfunction.

If the boiler ignites, but after a while it goes out, this may be due to a malfunction of the electronic board. You can check by replacing the board with a known good one.

Buderus error 3s (fourth indicator 80 flashes)

If such an error occurs, the boiler control board does not receive a signal from the differential pressure switch, that is, its contacts do not close after the fan starts. The pressure switch is used to determine necessary conditions removal of combustion products.

The procedure for starting the boiler into operation is as follows:

The control unit gives a signal to start the fan

The fan creates the necessary vacuum in the exhaust pipe

The differential relay registers vacuum and the microswitch contacts close

The board gives a signal to open the gas valve and ignite

Therefore, in order to understand the problem, it is necessary to determine at what specific moment the boiler goes into error. If the fan starts, but the relay does not click, it is tedious to inspect the supply pipes, perhaps there is a blockage or condensate, or there is actually a blockage in the chimney itself.

If the fan does not start, you need to check if voltage is applied to it. A faulty electronic board may be the reason why the fan does not start.

If the fan is running, there are no problems with the chimney and pneumatic relay tubes, you need to check the pneumatic relay itself by creating a vacuum yourself and checking for a characteristic click.

Permanently closed relay contacts or their opening during burner operation will also be regarded by the security system as a malfunction.

Buderus boilers can be equipped with a variable speed fan, which is electronically controlled and equipped with a sensor.

Error 4C (first indicator flashes)

The error occurs either when there is insufficient pressure in the heating system, or when the temperature at the outlet of the primary heat exchanger is too high. You need to check the pressure gauge. If the pressure in the system is not enough - less than 0.5 bar, it is necessary to feed the boiler. Too high temperature on the heat exchanger can also be caused by problems with the circulation of the coolant or an air lock. The source of the error is either a hydraulic pressure switch or a boiler water temperature limiter - a thermostat, which is located immediately at the outlet of the heat exchanger.

Error 4Y (the first two indicators flash)

Flow temperature sensor defective. For diagnostics, you need to measure the resistance at the sensor contacts. At room temperature, it must be within 10 kΩ, the sensor connection must be reliable, because. in case of a break, there will also be an error. The CL error logic is the same, only for the DHW temperature sensor. If the temperature sensor fails, the operation of the boiler is blocked, only the circulation pump remains in operation to prevent freezing. If the DHW temperature sensor is damaged, the operation of the boiler will not be blocked.

Error 2E (the first three indicators flash)

The logic of the error is too rapid growth flow temperature, i.e. the coolant at the outlet of the heat exchanger heats up too quickly and to prevent emergency overheating, the operation of the boiler is blocked for two minutes. The main reason for this behavior of the boiler may be poor circulation of the coolant. The most common causes of poor circulation are:

malfunction of the circulation pump or insufficient performance

heat exchanger clogged with dirt or scale

air in the heating system

In this article, we examined the most common malfunctions of Buderus gas boilers. A complete list of errors is contained in the equipment manual. Modern gas systems are designed so that the elements are as accessible as possible for ease of service. Some errors can be corrected by the user himself, for example, make up the boiler or inspect the chimney for blockages.

Doing any self-diagnosis should only be done when it is absolutely necessary to comply with precautionary and safety measures. If you do not have an idea about the principles of operation and device gas boiler- It is better to call a qualified specialist. The Buderus company posts informative videos in which the specialist talks, among other things, about the boiler errors that occur.

Typical breakdowns and repairs of Buderus Logamax wall-mounted boilers. Heat exchanger problem

IN Lately gained great popularity in the market of heating equipment . They rightfully occupy one of the leading places in the line of wall-mounted boilers.

The spread of autonomous heating systems is associated with the development individual construction housing.

In our country, it has not yet gained the necessary pace, but in Europe this phenomenon has long received the necessary scope.

All the most famous manufacturers of boilers for private heating systems are European companies.

One of the oldest European firms - - will soon turn 300 years old, during which there was a set of technological knowledge, experience and techniques.

Consider one of the most popular designs of gas boilers for autonomous heating systems.

Buderus has been manufacturing heating equipment for many years. Currently, it is part of the Bosh holding, which significantly increases the capabilities and quality of products.

European equipment is too expensive for a mass Russian buyer, but this obstacle was significantly reduced by building and launching a plant for the production of gas boilers in Engels.

They are considered the most convenient for installation in residential or public premises, since they can simultaneously heat and prepare hot water for domestic needs.

This greatly increases demand and preference, although for families with large DHW needs, the performance of two-circuit units is clearly insufficient.

If a large amount of hot water is required to ensure a normal lifestyle, it is more correct to use it in conjunction with an external boiler. The capabilities of double-circuit units cannot suit everyone, so you need to decide in advance on the volumes of hot water.

Kinds

The manufacturer offers boilers with different capabilities and design features.

According to the installation method, there are only , all floor standing boilers designed to connect external drives or boilers.

By type of heat transfer:

• Convection. The heat carrier is heated in the usual way, in the flame of a burner.
• Condensing. Preheating of the coolant is used with the help of thermal energy obtained from the condensation of water vapor from flue gases. As a result, the initial temperature of the RH becomes higher, which makes it possible to reduce the gas consumption and reduce the overall intensity of heating. However, this mode can only be used on low temperature systems and unless the outside temperature is relatively high, otherwise the possibility of steam condensation will cease. In Russia, this method is ineffective.

Type of combustion chamber:

• Atmospheric (open). The air necessary to ensure the combustion of gas is taken directly from the room where the boiler is located. Smoke removal takes place natural way, with the help of furnace type traction.
• Turbocharged (closed). For combustion, air is supplied by a special fan. It also creates a pressure difference that ensures the removal of flue gases.

NOTE!

For residential use, it is more convenient to use turbocharged boilers. Natural draft is unstable and depends on many external factors; in some cases, smoke in the premises is possible due to the occurrence of reverse draft.

Models

All double-circuit boilers Buderus with a power of 24 kW belong to the group of mounted units.

In the list of models are:

• Buderus Logamax U042-044-24K. The series is represented by two models with a capacity of 24 kW - with an open and closed burner. Condensation design allows you to get increased efficiency from the operation of the boiler, but it will be necessary to provide the necessary conditions.
• Buderus Logamax U052-054-24K. Convection double-circuit boiler with burner closed type. Possesses the possibility of wide power regulation (within the framework of the design).
• . Convection boilers with open and closed combustion chamber. Belong to the most popular group due to the low price.

All models of 24 kW Buderus boilers are capable of heating rooms up to 240 m2, with simultaneous preparation and supply of hot domestic water. A feature of all options is the exactingness to the quality and polarity of the power supply connection - it is imperative to use a stabilizer and a socket with a connected ground electrode.

If this is not observed, the control board will be constantly in danger of failure due to a power surge.

Specifications

Consider specifications 24 kW Buderus units:

Device

The design of double-circuit boilers Buderus in in general terms similar to the device of all modern models of gas units, the differences are only in small details. The main element is a gas burner, which is installed in conjunction with a copper primary heat exchanger for maximum effect.

The coolant, moving through the system under the action of a circulation pump, enters the primary heat exchanger, where it heats up, and immediately passes into the secondary plate-type heat exchanger. It is made of stainless steel. Some part of the thermal energy of the OB is given for the preparation of hot water.

Then the coolant enters the three-way valve, where it receives the temperature set by the operating mode.

To do this, it is partially mixed with the cooled return flow. The finished coolant enters the heating circuit, makes a circle and enters the boiler again. The operation of all nodes is controlled by the control board, which, through a system of sensors, constantly monitors the condition of the boiler parts and immediately notifies the user of a malfunction.

In case of danger, the operation of the boiler is immediately blocked.

Connection instructions

The Buderus boiler is connected after installation on a solid wall or a special ramp.

All communications join:

• Direct and return lines of the heating circuit.
• Water supply.
• Gas pipeline.
• Power supply.

Particular attention is paid to the condition of gas pipeline connections. They should be tested with soapy water for leaks. Then the power supply is connected through a special socket with a ground electrode.

The boiler starts up after filling the system with water.. It is poured using a make-up tap, bringing the pressure to about 0.8 bar.

This is necessary in order not to exceed the pressure when heated, so the water will expand. After filling the system, the boiler is turned on and the required temperature of the coolant is set. The burner will start, the boiler will start to work.

On first start after long downtime often it is necessary to make several attempts to start due to air locks in the system. When they are all removed, the operation of the unit will be stable and smooth.

Popular faults

The most common malfunctions in the first place include the failure of the control board.

It occurs due to uneven voltage supply.. It is expressed in the appearance of a series of errors on the display, the frequent designation of error A6 (lack of flame) and other failures.

The only solution is to replace the board and install a new one. The problem will recur if no voltage stabilizer is used.

Another common problem is illiterate or self-made installation. There can be many options here, from installing a chimney without the necessary slope, to skewing the pipe. As a result, condensate will constantly accumulate, which, freezing, will block the chimney and cause the boiler to block.

NOTE!

Installation and initial adjustment should be carried out only by specialists from the service center, otherwise the risk of damaging the equipment becomes too great.

Basic error codes

Consider the most common errors:

Owner reviews

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If you are not 100% sure what exactly the problem is and that you can solve it, immediately contact the service center to diagnose and fix the problem.

The burner does not turn on

The emergency switch of the heating system is in the off - on position.

Start switch of the control system in the off position - turn on.

The circuit breakers are faulty - check their operability, if necessary, replace the defective circuit breaker.

Boiler water temperature controller damaged - check and, if necessary, replace defective parts.

Safety temperature limiter damaged - check and, if necessary, replace defective parts.

Error message from external safety devices (for example, from a water level safety device) - the user must check the Buderus boiler, eliminate the malfunction and, if necessary, replace the element.

The flue gas control system has been triggered:

• AW 10 - unlock the flue gas control system;
• AW 50 - Wait a maximum of 15 minutes.

The boiler will turn on automatically if there is a demand for heat. If triggered repeatedly, check the flue gas path and check the function of the flue gas monitoring system. If there is a defect, then replace.

The burner starts and switches to fault. No spark on ignition

Is there a sound when an ignition spark is generated with the ignition cable removed?

• If not, then - replace the ignition transformer;
• If so, replace the ignition electrode or ignition burner.

Burner starts and switches to fault

All gas shut-off valves are closed - open the gas shut-off valves.

Natural gas supply pressure greater than 8 mbar - if not, find the cause and rectify the problem.

Has air been removed from the pipeline? Remove air until the gas can be ignited.

The burner of the Buderus boiler starts and switches to fault. No ionization current

If the N and L connections are reversed, fix the error.

Is there voltage between L and PE? If not, ground the PE, in this case install an isolating transformer.

Poor contact of the ionization wire - eliminate the error, in this case, replace the defective part.

Short to ground on the ionization electrode - fix the damage.

Defective burner control - replace the element.

The burner starts and switches to fault. Ionization current less than 1.5 mA

The core or ceramic of the ionization electrode is dirty - clean the ionization electrode, if necessary, replace the ignition burner.

Boiling sounds

Lime deposits or limescale build-up in the boiler - clean the water circuit of the heating boiler in accordance with the manufacturer's recommendations.

With constant loss of water, determine and eliminate the cause. If required, carry out water treatment and install a dirt trap.

Buderus error 3s flashing fourth indicator 80

If such an error occurs, the boiler control board does not receive a signal from the differential pressure switch, that is, its contacts do not close after the fan starts. The pressure switch is used to determine the necessary conditions for the removal of combustion products.

The procedure for starting the boiler into operation is as follows:

1. The control unit gives a signal to start the fan
2. The fan creates the necessary vacuum in the exhaust pipe
3. The differential relay registers vacuum and the microswitch contacts close
4. The board gives a signal to open the gas valve and ignite

Therefore, in order to understand the problem, it is necessary to determine at what specific moment the boiler goes into error. If the fan starts, but the relay does not click, it is tedious to inspect the supply pipes, perhaps there is a blockage or condensate, or there is actually a blockage in the chimney itself.

If the fan does not start, you need to check if voltage is applied to it. A faulty electronic board may be the reason why the fan does not start.

If the fan is running, there are no problems with the chimney and pneumatic relay tubes, you need to check the pneumatic relay itself by creating a vacuum yourself and checking for a characteristic click.

Permanently closed relay contacts or their opening during burner operation will also be regarded by the security system as a malfunction.

Buderus boilers can be equipped with a variable speed fan, which is electronically controlled and equipped with a sensor.

Buderus boiler error 6a how to fix

First of all, you need to exclude the accidental occurrence of an error and simply reset it. If the error occurs again and the boiler does not start, then the problem needs to be addressed. The ignition problem in most cases can only be fixed by a qualified technician. The simplest thing to do is to inspect the combustion chamber and electrodes for contamination and clean if necessary.

If the boiler makes unsuccessful attempts to ignite, visually check that the spark breaks through the burner, and not somewhere else. If a crackling sound is heard, but there is no spark between the electrode and the burner, the electrode insulation is probably damaged somewhere and it needs to be replaced.

The adjustment of the gas valve may only be carried out by a specialist. Checking the presence of proper network gas pressure can be carried out through a gas stove. If you light all the burners on the stove at the same time, they should work without interruption. If this is not the case, it can be assumed that the incoming pressure is not enough and you need to call the gas service.

In our practice, there was a case when a crack in the viewing window of the combustion chamber was the cause of the malfunction.

If the boiler ignites, but after a while it goes out, this may be due to a malfunction of the electronic board. You can check by replacing the board with a known good one.

German gas boilers Buderus logamax for a private house

For heating small private houses and cottages are recommended gas boilers Buderus manufactured by Bosch Thermotechnology GmbH in Germany. There are several models of this company on the market - a gas boiler Buderus Logamax u072 24k and a boiler with the same power and similar parameters called Buderus Logamax U042-24K. How to connect individual heating in a private house can be found in our article “Autonomous heating of a private house: choice best way»

The line of models manufactured by Bosch Thermotechnology GmbH is quite large, but the purpose of this article is to acquaint potential buyers with the two most popular models that represent the Buderus 24 kW gas boiler and their technical characteristics.

Boiler Buderus Logamax U072, 24 kW

The popular wall-mounted gas boiler Buderus 24 kW reviews are mostly good. People write that the boiler is one of those devices that “installed and forgot”, that is, they do not require constant supervision. It is often written that gas is consumed more economically, up to 20% and about good performance DHW systems(hot water supply). Of course, it cannot be only positive feedback. There will certainly be some disadvantages, for example, dependence on the mains and stopping the boiler with a significant decrease in gas pressure.

On gas boilers Buderus owner reviews can be found on the Internet. The name of the Logamax U072 boiler has a lot of incomprehensible letters and numbers. Therefore, in order to buy a Buderus gas boiler, you need to understand what they mean.

Deciphering "incomprehensible letters and numbers" is quite simple:

• wall-mounted convection boiler - Logamax;
• circulating gas boiler - U;
• installed standard burner - 0;
• range of gas boiler - 7;
• sealed combustion chamber - 2;
• rated power of the boiler - 24;
• double-circuit boiler model - K.

All technical data for Buderus gas heating boilers are indicated in the instruction manual, but for those who want to thoroughly study the Logamax U072 boiler, it is recommended to read the full description on the manufacturer's website. In many online stores that sell heating equipment, you can buy a Buderus gas boiler for a price of around 810 Euros.

The boiler is supplied with:

1. gas boiler Buderus;
2. fastening fittings;
3. documentation set.

It should be noted that the passport contains a warranty card for the Buderus Logamax u072 24k gas boiler, in which you need to stamp the store and the date of purchase. Without these marks, it will be very difficult to put the boiler in warranty service. One more thing. On the sites of online stores, you can easily find reviews on the Buderus 24 kW gas boiler and read them to confirm your right choice.

On the network, you can not only buy a Buderus gas boiler, but also order its delivery to any region.

Boiler Buderus Logamax U042, 24kW

It is impossible not to mention one more model - Buderus Logamax u042 24k. Its characteristics are almost identical with the U072 model. The main difference is in the direction of the piping. Model U072 uses a vertical layout, which sometimes facilitates the process of connecting the boiler to the heating system. Model u042 24k is in great demand due to its compactness, performance and high efficiency, which reaches 97%. Included with the Buderus Logamax u042 24k gas boiler, the instructions and technical description detail the installation, operation and safety rules. how to connect legally heating system in the apartment, you can read.

The model line of this popular boiler consists of two models U042-24K and U044-24K. The difference between them is as follows. Model U042-24K uses a closed combustion chamber, while the other model uses an open combustion chamber.

The technical data of the models are as follows:

• boiler power - 24 kW;
• double-circuit boiler;
• Efficiency - 97%;
• wall-mounted boiler;
• a closed combustion chamber is used;
• the boiler is equipped with a circulation pump;
• the boiler has a built-in expansion tank.

As with all German-made boilers, in this model much attention is paid to the comfort and safety of operation. For comfortable use, auto-ignition, flame modulation, an electronic thermometer and a power indicator are installed

This sought-after and popular gas boiler Buderus reviews are mostly positive, thanks to the applied protective measures on security.

The design of the Buderus Logamax U042-24K uses auto-diagnostics and gas control.

Of great importance for safe operation is the installed protection against overheating and freezing, a safety valve and protection against blocking the pump.

Protherm Cheetah 23 MOV

Specifications:

• double-circuit boiler;
• it has an open combustion chamber;
• the volume of the expansion tank is 5 l;
• hot water output is 1.5–11 l/min;
• consumes power in the range from 10.4 to 25.8 kW;
• useful power is 9–23.3 kW;
• hot water temperature adjustable from 38 to 60 °C;
• overall dimensions (H / W / D) - 742/410/311 mm;
• weight is 31 kg;
• heat exchanger - stainless steel lamellar;
• works under pressure of 1–10 atm;
• consumption liquefied gas is 1.9 kg / h, and natural - 2.73 m³ / h;
• productivity is 90.3%.

Model description

The wall-mounted heating boiler has a built-in LCD display and mechanical control using buttons. The screen displays the operation data of the device, which allows you to constantly monitor the heating process. The reliable burner is made of a chromium-nickel alloy.

Controlled by a room thermostat. The safety of the device is ensured by built-in sensors for traction control, water flow, flame control.

The boiler is equipped with anti-freeze, three-way valve and pump anti-jamming functions. The built-in diagnostic system monitors the status of the device, finds and identifies faults.

Advantages and disadvantages

Easy to install and maintain, ergonomic, reliable, compact, operates in the "winter-summer-holiday" modes. A large number of service settings allows you to select the most convenient mode of operation.

The disadvantages are weak power, high gas consumption, sensitivity to impurities in water. When the water is heated, the heating is turned off and vice versa.

It is impossible to install in rooms without a chimney, for the arrangement of which certain requirements are imposed. Requires additional air supply, cannot be used in a room with forced exhaust.

Installation and instructions

Upon receipt of the heater, check the complete set, appearance, warranty card and availability complete instructions for operation. Installation, connection, configuration and initial launch heating boilers should only be carried out by a specialist from the manufacturer.

During operation, the following points must be considered:

• repair, replacement of parts or parts of equipment are carried out in special service centers;
• change various options settings should also be performed by a specialist;
• all inscriptions on the boiler body must be preserved throughout the entire period of operation;
• failure to comply with these points during the warranty period gives the company the opportunity to revoke the warranty.

Boiler price

Heating devices of this model are sold in any specialized store of the company at a price of 29,000 to 30,200 rubles. Here you can also order a specialist for installation and initial setup of the device.

Buderus Logamax U052-24K

The 24 kW Logamax range includes boilers with both closed and open combustion chambers. Buderus U052 has a closed chamber and a forced combustion products removal system, and for logamax u054 characterized by an open combustion chamber. The gas boiler is equipped with a bithermic heat exchanger made of copper. The productivity of hot water supply is 12.6 liters per minute. It can run on natural or liquefied gas.

The logamax u052 boiler model is equipped with an 8-liter expansion tank, a circulation pump and electronic fire modulation. The operation of the unit is controlled using a convenient and understandable panel. It is also easy to control the indoor temperature with a weather-compensated system. to merit and features of gas boilers of this model include the following characteristics:

1. They can work in a system with several heating circuits, for example, together with underfloor heating or another heating unit.
2. High performance hot water supply - water is enough for the full operation of two taps or a tap with a shower.
3. Has a very convenient control system air temperature. You can set the desired number of degrees on the panel, and the system will automatically maintain the desired temperature.
4. Good efficiency - about 92%.
5. It has easy control and a control system for the operation of the boiler - you do not have to figure it out for a long time instructions.
6. In the process of gas combustion, a low amount of harmful substances is produced, so the boiler has sufficient environmental friendliness.
7. Installation can be done quickly and easily.

Boilers Buderus U052-24K are designed for customers who value multifunctional equipment and want to purchase a device that allows for separate temperature control.

The main advantage of this gas boiler model compared to the previous one is the fact that it consumes less gas with a similar power indicator.

The popularity of the German manufacturer

There are hundreds of companies that produce gas boilers, but German products are an order of magnitude higher than them in terms of reliability and quality. What is the reason? The basis of the highest quality, the famous German quality, is pedantic and careful design, scrupulous selection of materials and components. After the production of a prototype, tests are carried out and the project is adjusted according to the test results, and only then does the production of the product begin.

Therefore, German boilers are popular all over the world. They have established themselves as reliable, durable and economical devices with high efficiency. For example, Buderus convection gas boilers have an efficiency of up to 97%.

Error 2E the first three indicators flash

The logic of the error is that the flow temperature rises too fast, i.e. the coolant at the outlet of the heat exchanger heats up too quickly and to prevent emergency overheating, the operation of the boiler is blocked for two minutes. The main reason for this behavior of the boiler may be poor circulation of the coolant. The most common causes of poor circulation are:

• malfunction of the circulation pump or insufficient performance
• heat exchanger clogged with dirt or scale
• air in the heating system

In this article, we examined the most common malfunctions of Buderus gas boilers. A complete list of errors is contained in the equipment manual. Modern gas systems are designed so that the elements are as accessible as possible for ease of service. Some errors can be corrected by the user himself, for example, make up the boiler or inspect the chimney for blockages.

Doing any self-diagnosis should only be done when it is absolutely necessary to comply with precautionary and safety measures. If you do not have an idea about the principles of operation and the device of a gas boiler, it is better to call a qualified specialist

The Buderus company posts informative videos in which the specialist talks, among other things, about the boiler errors that occur.

Error codes for gas wall-mounted boilers Buderus Logamax

Error code 1A - Exhaust gas outlet at flow fuse

Check gas path.

Error code 1L - Exhaust gas outlet on the combustion chamber

Check the heat exchanger for contamination.

Error code 1Y - Exhaust gas temperature sensor not detected

Check flue gas temperature sensor and connecting cable for damage.

Error code 2E - Insufficient filling pressure of the heating system

Check filling pressure, increase it if necessary.

Error code 2P - Temperature difference too high

Check pump and bypass line.

Error code 4C - The limiter in the supply line has tripped

Check the pressure in the system, check the temperature sensors, check the operation of the pumps and the fuse on the printed circuit board, bleed the air from the device.

Error code 4E - The temperature sensor in the burner chamber is not detected

Check the temperature sensor in the burner chamber and the connecting cable for damage.

Error code 4Y - Flow temperature sensor not working

Check temperature sensor and connecting cable.

Error code 5H - EMS communication interrupted

Check connecting cable and regulators.

Error code 6A - Flame not detected

Is the gas cock open? Check the pressure in the gas network, mains connection, trigger electrode with cable and ionizing electrode with cable.

Error code 6C - Flame detected after shutting off gas supply

Check ionizing electrode. Check gas fittings.

Error code 8Y - No jumper found on ST8 161

If there is a jumper, insert the plug correctly, check the external limiter. Otherwise: is there a jumper?

Error code 9C - Coding plug not found

Insert the coding plug correctly, measure it and replace if necessary.

Error code CL - Hot water temperature sensor defective

Logamax U054-24K

• Check temperature sensor and connecting cable for damage or short circuit;
• The hot water temperature sensor is incorrectly installed.

Logamax U054-24K

• Check the installation area, if necessary, dismantle the sensor and reinstall it using heat-conducting paste.

Error code CP - Boiler sensor not found

Check boiler sensor and connecting cable.

EC Error Code - Internal Fault

Check the tightness of the connection of electrical plug contacts and jumper lines, if necessary, replace the printed circuit board.

Error code EL - Wrong reference voltage

Replace printed circuit board.

Error code EP - By mistake, the fault message reset button was held down too long (more than 30 seconds)

1. Press the reset button again and hold it down for less than 30 seconds.
2. Outside temperature sensor not found. Check the outside temperature sensor and connecting cable for damage.

Description of models

The brand in question, namely "Buderus", is one of the most well-known manufacturers, whose reputation is marked by consumer approval. Initially success accompanied this company, originally from German lands, because of their quality solid fuel boilers. But over time, the range of boilers operating on a variety of fuels has expanded significantly.

And the Buderus company also has such heating installations. Due to the unconditional quality, many retail buyers also worked with this brand, as well as those specialists who completely installed heating systems in houses.

But the most vulnerable point of the company's activity was the high cost of their products. However, a couple of years ago the company underwent a merger with Bosch, which helped to remove such a serious barrier to mass distribution of products. Now high quality products are available to people at a very budget price.

Before a consumer decides to buy a Buderus double-circuit gas heating boiler, it is worth familiarizing yourself with the Buderus Logamax model range.

The market of sellers in Russia in the field of heating systems offers the consumer mounted gas boilers Buderus 24 kW.

1. Buderus Logamax U042/U044. Double-circuit gas-fired heating boiler, with a copper heat exchanger, bithermic. The power of such boilers is 24 kW:
   • type with a closed combustion chamber - U042;
   • type with an open combustion chamber - U044.
2. Buderus Logamax U052/U054. These heating boilers available both in double-circuit and with one heating circuit, through which the coolant circulates. Rated - 24 kW. The boilers have an excellent production of hot water - from 11 l/min to 13 l/min. The only bithermic heat exchanger is made of high quality copper. The markings for these boilers are as follows:
   • U054 - an open-type fuel combustion chamber, at the chimney the diameter is 131 mm;
   • U052 - this marking has closed-type boilers - the so-called turbocharged boilers;
   • the presence of article A indicates that this is a double-circuit boiler.
3. Buderus Logamax U052 T / U054 T. These heating boilers are distinguished by the fact that the model has a storage boiler that can hold 48 liters of hot water. Such models are relevant for use in those houses where a large consumption of hot water passes per day. They are also represented by closed and open combustion chambers. Boiler power - 24 kW.
4. Heating gas boilers such as the Buderus Logamax U072 model are the most economical options However, this does not mean that they are of poor quality. On the contrary, careful design has helped manufacturers to make it possible to sell good boilers with the greatest financial benefit to the consumer.

All models can be used under the following systems to remove combustion residues, i.e. smoke:

• under the coaxial chimney, size 60/100 mm;
• and a system that separates the removal of smoke, with forced fresh air and a size of 80/80 mm.

The main characteristics of the model range of the gas boiler.

The main typical characteristics for a gas double-circuit wall-mounted boiler Buderus contain the following data:

• the power of such a boiler is 24 kW;
• natural gas consumption as the main fuel is 2.8 cubic meters in 60 minutes;
• the water heats up quite strongly, up to 63 degrees;
• the pressure that is permissible for fuel is 0.016 bar;
• the expansion tank installed in this model has a volume of 8 liters;
• when heated to 50 degrees, the boiler performance is 11.4;
• it is possible to connect to this model both a water supply system in order to heat running water, and attach a boiler for the same purposes. That is, running water enters the boiler and gradually heats up, because warm outline. It is necessary to use components with a diameter of ½. If you connect steam heating, then the section will be 3/4 .;
• power consumption will be 150 W;
• equipment weight - about 30 kg.

The boiler is quite easy to install, and since it has relatively small parameters and weight, you can pick it up from the store yourself.

Features of Buderus boilers

The German company Buderus produces boilers that run on almost any type of fuel - solid fuel, using wood, coal, briquettes, coke, liquid fuel, running on diesel fuel, gas and electric. The most popular are solid fuel and gas.

Solid fuel completely autonomous, can work without additional energy sources (without electricity), on various types fuel - wood, coal, coke, briquettes, peat. They have a long burning cycle, thanks to a large loading chamber and an ash pan. Buderus solid fuel boilers are used both as an autonomous heating system and in conjunction with units that run on gas or diesel fuel.

Suitable for systems operated by a pump and for systems in which circulation occurs due to the temperature difference between hot and cold water, for open systems or with expansion tank. They are compact and can be installed even in small spaces.

Gas boilers are the most common, due to the availability and relatively low price of gas. According to the type of installation, they are divided into wall and floor, according to the type of use, into single-circuit and double-circuit. Despite the small size, wall boilers have a large power range - from 14 to 100 kW, the most popular are Buderus units with a power of 24 kW.

Gas boiler Buderus

Floor-standing boilers can be used in residential premises and in production, they have a large power range up to 38 MW. Like all gas equipment, Buderus Logomax boilers are equipped with automatic system control. During operation, the system displays data on errors and malfunctions on the display.

Other breakdowns

In addition to those described above, automation can also signal other malfunctions on gas boilers:

1. Code 4Y appears on the display after a drop in the temperature of the coolant, for example, after a power outage.
2. Code CL means a malfunction of the hot water sensor. The reason may be a short circuit of the sensor and the wire, in which case you will have to change the sensor.
3. The value 9C lights up on the display if the DIP switches are set incorrectly (there are 8 of them on the Buderus Logomax u042 24k model). Carry out the settings according to the table in the instructions for the device.
4. The CP code is displayed when the automation does not see the temperature sensor. In this case, you should check the sensor connection contacts and its serviceability. The sensor cannot be repaired, only replaced.
5. Code d7 indicates a malfunction of the gas valve. Check the gas connection and the operation of the gas block, if the block is faulty, it will have to be replaced.
6. Code C7 reports a fan failure. Check the condition of the fan, its wires and plug.

There are problems that the display does not fix. For example, if a loud water noise is heard or the water takes too long to heat up, the pump speed should be adjusted. If the outlet water temperature is insufficient, check the turbine and replace it if necessary.

In case of problems with ignition, you need to check the gas pressure, if the electricity is turned off, see if the electrode connections with wires are oxidized, if the chimney is clogged and tight, if the burner is clogged.

Buderus Logamax U072-24K

The model of gas boilers Buderus Logamax U072-24K with a capacity of 24 kW is the most economical of those presented. It has a closed combustion chamber, and depending on the quality of the insulation of the house, it can heat a room up to 250 m². The boiler can operate on both liquefied and natural gas. It is able to provide up to 11.5 liters of hot water per minute. The U072-24K is equipped with:

• electronic system work management;
• primary heat exchanger made of copper;
• circulation pump;
• expansion tank with a capacity of 8 liters.

This model is designed to work in your home or in an apartment of multi-apartment housing, where everyone has individual autonomous heating.

Note! A gas boiler does not require a solid chimney; it will be enough to bring an inexpensive coaxial analogue outside the house. . The main advantage of the Logamax U072-24K model is that it is able to provide full heating even in adverse conditions - at low gas and water pressure

Also, the advantages of this boiler are:

The main advantage of the Logamax U072-24K model is that it is able to provide full heating even in adverse conditions - at low gas and water pressure. Also, the advantages of this boiler are:

• low noise level during operation - less than 36 dBA;
• availability of a comfortable buderus logamatic control systems;
• hardy equipment that can work even in difficult conditions, which is very important in our country;
• security, which is provided by a variety of sensors that monitor the presence of gas and flame;
• ease of maintenance and installation.

A feature of the U072-24K boilers is the presence of two heat exchangers: one copper, which heats the coolant in the heating system, and the second - stainless steel for heating water. Below is a video on how to properly configure the parameters of this model.

Advantages and disadvantages

If you have a problem choosing a 24 kW boiler from Buderus, you should familiarize yourself with the main advantages and disadvantages of the product.

The advantages of boilers of a well-known manufacturer include:

• The assembly of boilers is carried out on precise equipment.
• The production process is tightly controlled. The birthplace of the brand is Germany, which positively characterizes the process of checking the quality of products. This also explains the high demand for Buderus boilers.
• Models of any level are sold under the brand of a well-known company. The catalog can be found as simple boilers and models with advanced features. They differ big amount features and wide functionality. Each consumer can get the product that he needs.
• Price availability. Difficult to find cheaper and the same quality boilers, as in the "Buderus" catalogue.

All products are highly environmentally friendly. The developers have implemented such a design of the boiler, in which the combustion products are obtained as safe as possible for the environment.

In addition to the positive aspects, such products also have negative ones. Their list can include:

• Wall-mounted double-circuit "Buderus" are sold in stores quite rarely. There are other brands in the top today.
• Many users pay attention to the frequent occurrence of burner malfunctions.

More significant shortcomings in gas boilers of a popular brand cannot be found.

Boiler Buderus malfunction

Like any other wall-mounted boiler, Buderus is equipped with a protection system and in the event of an emergency situation, work will be stopped and the user will receive an error message that indicates in which system of the unit the malfunction occurred.

Some devices are equipped with a liquid crystal display, and the user will see an error code. If the boiler is not equipped with a display, the fault will be indicated by flashing the temperature indicators. For example, if the temperature indicator 80 flashes, this means a 3C error that would appear on a similar boiler with a display.

A complete list of error codes reflected by blinking indicators can be viewed in the figure. Next, consider the most common errors and recommendations for their elimination.

Boiler Buderus error 6a

Error buderus 6a (second indicator flashes) occurs when the boiler does not detect a flame on the burner. Flame control is one of the most important functions of a safety system. To control the flame, there is a special electrode on the burner through which a small current flows during combustion. The control board constantly captures this current. If for some reason the current on the ionization electrode disappears, error 6a occurs. The same thing will happen, for example, after several unsuccessful attempts to ignite the boiler - this is the most common situation.

The reasons are standard for all boilers:

• incorrect adjustment of the gas valve (insufficient network gas pressure)
• poor contact or no signal from the flame ionization sensor
• flame control sensor malfunction (dirty, broken)
• control board failure (required)
• incorrect electrical connection of the boiler (lack of grounding)
• lack of air for proper combustion (lack of draft, clogging of the intake pipe)

The buderus 6a error is classified as critical, which means that after the occurrence of such a malfunction, the boiler will not start on its own - the error must be reset!

There are two options for resetting the error:

• keep the OK button pressed until the fault signs disappear, the boiler starts working again and the display shows the flow temperature.
• Turn the boiler on and off

Bosch Gaz 6000 W WBN 6000-24 C

Specifications:

• type - wall-mounted, double-circuit;
• the boiler is equipped with a closed combustion chamber;
• it has an expansion tank with a volume of 8 liters;
• hot water productivity - 13.7 l / min;
• useful power range - 7.2-24 kW;
• heating system temperature - from 40 to 82 ° C;
• boiler dimensions (H/W/D) 700/400/299 mm;
• the unit weighs 34 kg;
• natural gas consumption - 2.1 m³ / h, and liquefied gas - 1.5 kg / h;
• the maximum allowable inlet pressure is 10.5–16 mbar;
• two heat exchangers: copper and steel;
• The efficiency is 93.2%.

Model description

With a small compact size, the boiler has many necessary and useful functions. It features a large backlit LCD display with push button controls. The screen displays information about the operation of the system. The device is endowed with the function of automatic parameter setting, equipment self-diagnosis and alarm.

To control the safety of operation, the boiler has sensors for water temperature, pressure, flow with a coarse filter.

It is equipped with a pressure gauge, a three-speed circulation pump, an overheating protection system, an automatic air vent and a safety valve.

Advantages and disadvantages

Easy to operate, compact, no noise during operation, high performance, stable operation under pressure drops, good heat dissipation.

The disadvantages include the sensitivity of the heat exchanger to hard water (scale, deposits).

Installation and instructions

The boiler is connected only in closed systems DHW and heating, all other installations are considered as improper use.

To maintain the warranty, you must follow some recommendations:

• installation of equipment is carried out in full accordance with the requirements of the project and the manufacturer;
• work on installation, adjustment and start-up of the boiler must be carried out by employees service center with a license to allow the provision of such services;
• repair, alteration of equipment is entrusted only to a specialized organization;
• all replaced and installed spare parts must be original;
• the inscriptions on the boiler body remain intact throughout the entire period of operation.

Prices for boilers Bosch Gaz 6000 W WBN 6000-24 C

At a cost in specialized stores, heaters of this model do not have a cardinal difference. They can be purchased at prices ranging from 28,900 to 30,200 rubles.

conclusions

Wall and floor gas boilers "Buderus" are high-quality and powerful enough heating devices worth installing in your home. They have many useful features and are easy to use. Installation of such devices does not take much time. The control panel in most models is intuitive. The high cost of models is justified by their high quality

Special attention when choosing specific model it is worth paying attention to the technical characteristics of the device. This will allow you to correlate its technical data with the tasks.

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