Any equipment can break. The main thing is to quickly and effectively eliminate the breakdown. To facilitate the task, the Bosch gas boiler gives errors on the display. These characters indicate the cause of the fault. You can find decoding and proceed to finding a problem. And we describe it, we describe below.

Features of the Bosch Gas Boiler

The two-rounded device is the most popular among users. It simultaneously works for hot water supply (DHW) and heating. Some models are equipped with two heat exchangers that ensure uninterrupted operation of the system.

Control panels are located in the control panel. Therefore, the heating can be adjusted under the area of \u200b\u200bthe room. How does the equipment switches from one contour to another? For this, a three-way valve is provided. The work of the boiler is focused on the main outline - heating. When the mixer is opened, the valve switches the flow to the DHW system.

Circulation of the coolant provides a pump. Sensors monitor the device and with deviations in operation fill the signal to the control module. As a result, error codes appear.

Errors and malfunctions

The table contains error codes that match bosch models WBN 6000-24C, Bosch Zsc 24-3 (35-3) MFA, ZWC 24-3 (28-3, 35-3) MFA, BOSCH ZWE 24-4 (28-4), ZSE 24-4 MFA, BOSCH ZWE 24-5 MFK, BOSCH ZWE 24-4 (ZSE) MF.

Other malfunctions

In the boilers, "" There are problems that are not displayed as an error.

The burner does not work

You need to check the status and enable emergency and starting switches. If one of the safety machines is faulty, repair it or replace the device.

Also, diagnose temperature controllers, removal products relay. Make prophylactic cleaning of firebox, burners, nozzles, tap pipes.

No spark without reason

Look for a problem in:

• Ignition electrode. Clean it, post closer to the burner.
• Burner.
• Plear transformer.

Noise and hum when turning on the boiler

Spend cleaning parts, including heat exchanger, from scale. Salt sediments interfere with heat transfer, so water boils and sweats. If you do not remove the flare, the node will overheat and fail.

Hot water does not turn on

If there is no mixer when opening hot water, Inspect the three-way valve. When breakdown it needs to be changed. Also be sure to correct the mixer, clean the pipes and block filters.

Whistle with burner

The size of the nozzles does not correspond to the pressure in the gas line. Change them.

Black smoke and soot

Cleaning the ignition block is required. Details and holes beat dust and mud.

Cotton, noise with ignition

What could happen:

• The gas supply is incorrectly configured.
• Incorrectly selected the size of nozzles.
• Skurn the chimney.
• Invalid structure of the chimney mine.
• Do well run ventilation indoors.

We hope that by reading the article, you will determine the cause of the breakdown. You can repair the repair yourself if you understand the technique. However, remember: before starting work, it is necessary to overlap the supply of gas and water.

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Bosch boiler - errors and their meaning

Bosch WBN 6000 Boiler Error Codes

A7. - Facility of the temperature sensor of the DHW. Inspect the sensor for the presence of a defect or short circuit and its wiring. Replace if necessary.

AD - The unit cannot fix the boiler temperature sensor. It is required to inspect the thermal sensor of the boiler and connecting wires.

C1 - The fan rotates low frequency. Need a network voltage check. Also inspect the output system flue gases And, if required, clean it or repaired.

C4. - No opening of the differential pressure relay if the fan is turned off. It is required to inspect the DIF. pressure switch.

C6. - The differential pressure relay does not occur. Check the fan and wires with plugs. Run replacement if required. View DIF. Pressure switch and output pipes for combustion products.

C7. - The fan does not work. Check the fan and its wires with plugs. Run replacement if required.

CE - Lack of pressure in heating system. It is required to pour water.

d7. - Malfunction gas system. Check the connecting wire. Inspect the gas system and replace if necessary.

E2. - Problem temperature sensor on the feed line (cliff). It is required to check for possible damage or short circuit of the sensor and its wiring. Conduct a replacement if required.

E9. - The heat exchanger works the temperature limiter. It is required to check for possible damage to the heat exchanger temperature limiter and its connecting wires. Run the replacement if necessary. Check the nominal pressure in the system. Inspect the temperature limiter and change the new, if necessary. Run start checking circulating pump And, if necessary, replace it. Check fuses, change if necessary. Remove air from the aggregate. Check the water circuit in the heat exchanger. If necessary, replace. Check for possible damage to the temperature limiter of flue gases.

EA - No flame. Check Connecting Wire Protection. To see if a gas crane is outdoor. Test the testimony of the supplied gas pressure and, if necessary, eliminate. Check connection to electrical network, electrodes with wires and, if required, replaced. Inspect the output system products combustionClean or repair. Conduct control of gas adjustment,
eliminate if necessary. For natural gas: inspect the relay controlling the gas flow. Change if necessary. In the process of working with the air fence for burning out of the room, check the air intake and ventilation holes. Clean the heat exchanger. Check the gas system, replace if required.

F7. - When the boiler is disconnected, the flame determines the flame. To check on the oxidation of the electrodes, if necessary, replace. Inspect the combustion product output system and, if necessary, cleaned or repaired. Check for humidity electronic control board, dry, if required.

FA. - The flame is defined when the gas flow is disabled. Check the gas system, replace if necessary. Inspect the electrodes and connecting wires, if necessary, replace. Inspect the combustion product output system, clean or repair.

P. - The type of boiler is not defined. Configure the type of unit.

FD.

Bosch ZWC MFA Boiler Error Codes

A2, C3. - The yield of flue gases on the combustion chamber. Perform checking the heat exchanger for clogging.

A3. - The temperature sensor of flue gases is not defined. You need to check for damage the sensor and connecting cables.

A4. - The yield of flue gases on the flow fuse. Check out the output of flue gases.

A6. - The thermal sensor in the combustion chamber is not defined. You need to check for damage the sensor and connecting cables.

A7. - Facility of the temperature sensor of hot water supply (DHW). Check to search for defects or short circuit of the thermal sensor and its wiring, if required - replace.

A8. - Contact with bus-bus interrupted. Check the contact cable and regulators.

A9. - incorrect installation of the GWS sensor. Check the mounting distances, if necessary, remove the sensor and mount it again using the heat-conducting paste.

AC - The module is not defined. The module is incorrectly connected. Perform a check of the module, an outdoor temperature sensor, remote control and contacts.

AD - The unit cannot fix the boiler temperature sensor. It is required to see the boiler thermal sensor and the contacts of the wires.

b1. - The coding plug is not defined. Spend proper installation coding plug, make it measurement and replace, if required.

C1, C6. - The differential pressure relay does not occur. Check the fan and wires with plugs. Run replacement if required. View DIF. Pressure switch and output pipes for combustion products.

C4. - Diff. Pressure relay in the disconnected position does not open. Check the differential pressure relay.

CC. - The control unit cannot detect the outdoor temperature sensor. It is required to inspect the sensor and the contact cable for a break.

d3. - A jumper 161 was not detected on ST8. If there is a jumper, insert the plug correctly, check the external limiter. In another case: Check if there is a jumper.

d4. - There is a large temperature discrepancy. Perform a check of the circulation pump, the bypass and pressure hose in the system.

d5. - The external temperature sensor is damaged. Check the sensor and connecting contacts.

E2. - The flow temperature sensor is faulty. Check the sensor and connecting contacts.

E9. - The feed line occurred in the feed line. Perform pressure test in the system, temperature sensors. Control the functions of pumps and fuse on the control board, remove air from the unit.

EA. - The flame is not detected. Inspect the gas crane. Check gas pressure, network connection, ignition electrode with wire and ionization electrode with cable.

F0. - Internal problem. Check the correctness of connecting electrical plugs and starting lines, if necessary, replace the e-board.

F7. - The flame is determined when the unit is disabled. Check the electrodes and cables. It is possible a flue gas removal system faulty. Check the control board on humidity.

FA. - Flame detection after turning off the gas intake. Make an inspection of the ionization electrode. Check the gas system.

FD. - incorrectly pressing the button (duration of more than 30 seconds). Press the button again less than 30 seconds.

Fault and adjustment boilers Bosch

WBN 6000-24 wall boiler. Gas is natural. Already a long time ago an EA error appears. After reading about EA error, I decided to find out the firmware of the board and setting the fan stage. If the version of the software version gives "245-03" and no matter how questions, the fan steps menu showed the digit "17". The smoke system is horizontal with a concentric pipe. From the boiler output about 2 meters. No adapter for the air intake of the room is not installed and the air in the unit comes from the outside of the room. What guaranteed the masters by installing the 17th stage of the fan, although, judging by the instructions, the 2nd step is needed. Do I need to change the fee?

Adapter is not needed. You have a standard coaxial with an air fence outside. Helps to get rid of this error to set the fan step in value 5. I was the same, and when I specified 5, there was no error for a year.

Recently washed heat exchangers gas boiler Bosch 6000. The month has worked and kept the pressure on 1. Then she attracted a strange murder sound inside it before the burner ignition (in cooling mode), as if water from one mug to another is overflowing. I looked, and the pressure 0, in theory it was necessary to automatically turn off when the pressure drops in the system to 0.5, but it worked and warmed the battery. The only thing that appeared another sound and murmur. I added pressure to 1, but the next day the pressure dropped again to 0.5 (that is, there is a water leak somewhere). I checked the pipes and radiators, but I haven't found a leak anywhere. From the unit, either does not eat, and the pressure drops anyway. Tell me what can be
problem and where to look for it?

I had a similar one. In the system, the air and after the operation of the device, the air went out, and the pressure fell. Do you have a valve of an automatic air vent (from top of the pump) not closed? It is necessary that it is always ajar. Pressure is better to bring up to 2 atm. To expansion tank In the boiler, too, took the volume and compensated for the exit air. In radiators, of course, also burst the air with the air crane Maevsky.

The Gas Wall Copper Bosch 6000 24 kW often issues an EA error and often turns on and off. That is, conditionally, set at least 40 degrees, literally 5 minutes and turned off, etc. It was earlier than it should, but now the first hot batteries, long barely warm, does not reach them. It works on the temperature of the return, no room thermostat.

ERA error can be eliminated by setting the fan step to 5. What the unit is quickly turned off, it means that its minimum power is too high for your system. It is less than 8 kW can not give. And you probably 5 radiators in the system. Here it heats this water and turns off. And why he heats them so fast so quickly, the following faults are possible: the first radiators have been clogged or balancing, and the first radiators should not be balanced so that the entire flow is not only through them. Here you have to watch the scheme of radiators and so on. Try to set the pump speed per maximum (value 3) and post-air in radiators.

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