Boiler error codes Bosch 6000. Heating systems for country and country houses. Boilers, gas water heaters, water heaters - Repair, service, operation. Recommendations for assembly and installation. Error code d4 - Temperature difference too large

Problem: “On a new BOSCH WBN 6000-24c boiler, an EA error appears - no flame was detected. The more degrees are set, the less frequent the error. But at low temperatures, it gives an error almost every day. The flame icon disappears before the error occurs. What to do?"

Check if the protective conductor is connected;
Check if open gas cock;
Check gas pressure, correct if necessary;
Make sure that the connection to the mains is working properly;
Check electrodes with wires, replace if necessary;
Check the flue gas outlet system, clean or repair if necessary;
Check the gas regulation, correct if necessary;
For natural gas: check the gas flow monitor. Replace if necessary;
When working with combustion air intake from a room, check the air supply to the room and ventilation openings;
Clean the heat exchanger;
Check gas valve, replace if necessary.

In 90% of cases, the problem is in the board. The best thing is to immediately contact the service center. There they will be able to provide high-quality assistance: make diagnostics and repair the boiler.

Hopefully the article " Gas boiler WBN BOSCH 6000-24c EA error"Was useful to you.

Bosch boiler errors - Meaning, causes and remedies

We have such a problem. The Bosch boiler is two-office, we use it for only six months. They turned on hot water, but it does not heat up, knocks out the boiler and shows an error E9. The filter was cleaned, the device started up, but after an hour it turned off again. Shows the error. When we start, the pressure rises immediately and the unit is cut down. Then we turn on, the fuses immediately burn out and the boiler goes out. So we can't turn it on. Please help in
what could be the reason?

Most likely your pump is jammed. Usually the fuses are lit because of the pump.

Boiler bosch gas 6000w. Was purchased in August this year. As a sudden cold snap came, it turned off and showed an error C6 (the differential pressure switch does not turn on). After removing the front cover, it was found that the tubes that fit this relay were covered with frost. After drying the tubes, the device started up. This situation has been repeated several times already. Is there any way
get rid of this problem?

It is necessary to look at how the smoke exhaust system is made. Separate system often leads to such consequences. We recommend replacing it with a coaxial one. If there is no opportunity to change the chimney, then the pipes must be insulated.

Wall mounted boiler Wbn 6000-24. The gas is natural. The EA error has been appearing for a very long time. After reading about the EA error, I decided to find out the firmware of the board and the settings of the fan stage. If the software version displays "245-03" in the menu and does not seem to raise any questions, then the menu of the fan stages shows the number "17". Horizontal chimney system with a concentric pipe. The exit from the boiler is about 2 meters. No fence adapter
I have not installed air from the inside of the room and the air enters the unit from outside the room. What guided the masters when they installed the 17th stage of the fan, although, judging by the instructions, the 2nd stage is needed. Do I need to change the board?

No adapter required. You have a standard coaxial with outdoor air intake. It helps to get rid of this error by setting the fan step to 5. I had the same thing, and when I asked 5, there was no error for a year now.

Tell me, does the burner use modulation only when using a thermostat or in some other cases?

When the temperature of the coolant approaches the set modulation, the boiler turns on in any case, regardless of whether there is a thermostat or not, but since this process takes little time, it is difficult to fix it. If an OT thermostat is used, then modulations begin to occur when the room temperature approaches the set one. If an On / Off thermostat is installed, there is no connection.

Private house 70m2 300mm foam block 50mm mineral wool and facing with ceramic bricks. There are plans to expand the area by another 50-60 sq. m. On the ground floor there is a transformer substation 33m2, heating batteries are installed on both floors. The hot water supply is implemented by a kitchen and a bathroom, and there will be a second bathroom in the one in need. I would like to supply BKN Drazice 125. Since a riser is installed in my house, I plan to install a wall gas boiler With
coaxial chimney... Considering different variants... The most optimal for the price is the Bosch 6000 (18 kW), but the bosch gaz 7000 has a minimum power of 24 kW, which, I think, is too much for me. Of the important, I need that the boiler has the ability to set the temperature in the boiler and, in the future, it would be possible to mount a room thermostat and an outdoor sensor. Interested in
the difference between the specified models by the composition of components or by the place of assembly? Maybe there are some other fundamental differences?

In your case, the most optimal would be model bosch gaz wbn6000-18 and wstb 120.

Error codes for Bosch WBN 6000 boilers

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

Error Ad- The unit cannot fix the boiler temperature sensor. It is required to inspect the boiler temperature sensor and connecting wires.

Error C1- The fan rotates at a low speed. Need to check the mains voltage. Also inspect the flue gas system and, if necessary, clean or repair it.

Error C4- No opening of the differential pressure switch if the fan is off. It is required to examine the diff. pressure switch.

Error C6- Differential pressure switch does not close. Check the fan and wires with plugs. Replace if required. Inspect diff. pressure switch and flue gas outlet pipes.

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

CE error- There is not enough pressure in heating system... Water is required.

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

Error E2- Malfunction of the temperature sensor in the supply line (interruption). It is required to check for possible damage or short circuit of the sensor and its wiring. Replace if required.

Error E9- The temperature limiter in the heat exchanger is triggered. It is required to check for possible damage to the temperature limiter of the heat exchanger and its connecting wires. Replace if necessary. Check the nominal system pressure. Inspect the temperature limiter and replace with a new one if necessary. Run test run circulation pump and if
it is necessary to replace it. Check fuses, replace if necessary. Remove air from the unit. Check the water circuit in the heat exchanger. Replace if necessary. Check the flue gas temperature limiter for possible damage.

EA error- No flame. Check the connection of the protection wires. See if the gas cock is open. Test the supply gas pressure reading and eliminate if necessary. Check the connection to electrical network, electrodes with wires and, if required, replace. Inspect the flue system, clean or repair. Check the gas regulation, eliminate if necessary. For natural gas: Inspect the gas flow switch. Change if necessary. When working with combustion air intake from the room, check the air flow into the room and the ventilation openings. Clean the heat exchanger. Check gas system, replace if necessary.

Error F7- When switched off, the boiler detects a flame. Check for oxidation of the electrodes, replace if necessary. Inspect the withdrawal system combustion products and, if necessary, clean or repair. Check for moisture electronic board control, dry if required.

FA error- A flame is detected when the gas supply is turned off. Check gas system, replace if necessary. Inspect electrodes and connecting wires, replace if necessary. Inspect the flue system, clean or repair.

Error P- The type of boiler is not detected. Set up the unit type.

Fd error

Error codes for boilers Bosch ZWC MFA

Code A2, C3- Flue gas outlet on the combustion chamber. Check the heat exchanger for clogging.

Code A3- Indefined temperature sensor flue gases. The sensor and connecting cables need to be checked for damage.

A4 code- Flue gas outlet at the flow protector. Check the flue gas outlet.

Code A6- The temperature sensor in the combustion chamber is not detected. The sensor and connecting cables need to be checked for damage.

Code A7- Malfunction of the hot water temperature sensor (DHW). Perform a check to find defects or short circuits of the temperature sensor and its wiring, if necessary, replace.

Code A8- The contact with the BUS bus has been interrupted. Check the overhead cable and regulators.

Code A9 - Incorrect installation DHW sensor. Check the installation distances, if necessary remove the sensor and reinstall it using heat-conducting paste.

AC code- The module is not defined. The module is not connected correctly. Check module, sensor outside temperature, remote control and contacts.

Ad code- The unit cannot fix the boiler temperature sensor. It is required to inspect the boiler temperature sensor and wire contacts.

Code b1- No coding plug defined. Spend correct installation coding plug, measure it and replace if required.

Codes C1, C6- Differential pressure switch does not close. Check the fan and wires with plugs. Replace if required. Inspect diff. pressure switch and flue gas outlet pipes.

Code C4- Dif. the pressure switch in the off position does not open. Check the differential pressure switch.

CC code- The control unit cannot detect the outside temperature sensor. It is required to inspect the sensor and contact cable for breakage.

Code d3- No jumper 161 was found at ST8. If there is a jumper, insert the plug correctly, check the external stop. Otherwise: check if a jumper is present.

D4 code- There is a large temperature difference. Check the circulation pump, bypass hose and system pressure.

D5 code- The external temperature sensor is damaged. Check the sensor and the connection contacts.

Code E2- The flow temperature sensor is defective. Check the sensor and the connection contacts.

E9 code- A limiter has been triggered in the flow line. Check the pressure in the system, temperature sensors. Check the functions of the pumps and the fuse on the control board, bleed the unit.

EA Code- No flame detected. Inspect the gas cock. Check the pressure in the gas network, the mains connection, the ignition electrode with cable and the ionization electrode with cable.

F0 code- Internal problem. Check the correct connection of the electrical plug contacts and the starting lines, if necessary replace the electronic board.

F7 code- The flame is detected when the unit is off. Check electrodes and cables. The flue gas removal system may be defective. Check control board for moisture.

FA code- Flame detection after gas supply shutdown. Inspect the ionization electrode. Check the gas system.

Fd code- Incorrect pressing of the button (duration is more than 30 seconds). Press the button again less than 30 seconds.

Malfunctions and adjustments of Bosch boilers

Bosch assures that its heat exchangers are not covered with special protective anti-corrosion paint. Heat exchangers from other companies (Viessmann, Vaillant, Ariston, Baxi) have a protective layer applied, while they have pure copper. And they present it as the advantages of their models. Is this so or is it just a reduction in the cost of the device.

Copper really does not corrode, which is why it is used. But due to its properties, copper burns rather quickly.

As I know, there are two options for connecting the BKN to a two-circuit gas boiler. First, through three-way valve... Second, through a hydraulic separator. In both cases, it is used as a consumer for the heating system, respectively, it will be heated from the temperature of the heating system. This is clear to me. But I do not understand what to do with the DHW taps, and whether it is possible to simply put plugs on them. At first I
I assumed that I would buy a Bosch 6000 single-circuit boiler, but since it was not available, I was advised to opt for a double-circuit one. And I’m thinking, if I drown out the outputs, will the heat exchanger be damaged (will it burn out without water)? Since I will not keep the unit constantly operating at maximum, let the BKN continue to work. Moreover, I bought ACV Comfort 130, and by design it is a tank in the tank and, in fact, should keep the temperature better than with a coil. Among the disadvantages of such boilers is the maximum pressure of 3 bars, and safety valve on the same pressure. A knowledgeable people it is reported that if the valve for some reason does not work, the tank will burst. About the double-circuit model - I am afraid that if the boiler fails, I do not hot water I'll stay.

Your conclusions are correct only for purified water. For household needs, you can establish a backup line. But in my memory, the cases of failure of ACV boilers have never happened.

In a private house, I organize a separate smoke exhaust for a 24 kW Bosch 6000 gas boiler. In this regard, I have two questions. Exhaust tract. Is it worth going from "pants" 80-80 through a tee with a condensate drain to a vertical chimney diameter of 100 mm? Pipe cost different diameters does not differ much from each other. Chimney heights up to tee 4800 mm. I bring the pipe through the roof
given 10 degrees. Intake tract. I am going to organize air intake in an unheated and well-ventilated attic. Before outer wall about 4 meters. Do not take air from the room good decision... The distance from the point of intake in the attic room to the upper plane of the unit is about 1050 mm (and inside the boiler room 800 mm of the entire length). In winter, such a solution can create a number of problems,
the main one is that air from outside temperature... It is also possible for strong condensation to form on the air duct, which will fall on the body. But if condensation can be dealt with with thermal insulation, then how to solve the problem of the flow of warm air is not clear to me. How option considered to feed the air duct from the chimney of the bath (you will need to weld
water register with a diameter of 300-500mm). Organize circulation in the register in a separate circuit. It is very difficult, but it should work. Tell me which chimney kit is suitable for installation on wbn 6000-24 c? It is necessary to bring the chimney directly behind the wall with a thickness of 375 mm; further it will not need to be pulled anywhere. Since the prices for branded equipment are very high, I would like to try another manufacturer.
Neva, for example. Will it be possible to reprogram a single-circuit unit if you disconnect the DHW flow sensor first?

No. It will be necessary to replace the control board of a single-circuit boiler and the hydraulic unit from it. And also additionally install a three-way valve.

We recently flushed the heat exchangers of the Bosch 6000 gas boiler. I worked for a month and kept the pressure at 1. Then I attracted a strange babbling sound inside it before igniting the burner (in a cooling mode), as if water were being poured from one mug into another. He looked, and the pressure was 0, In theory, it should have turned off automatically when the pressure in the system dropped to 0.5, but it worked and warmed up the batteries.
The only thing that appeared is a different sound and murmur. I added the pressure to 1, but the next day the pressure dropped back to 0.5 (i.e. water is leaking somewhere). I checked pipes and radiators, but found no leaks anywhere. It also does not drip from the unit, but the pressure still drops. Tell me what could be
problem and where to look for it?

I had a similar one. In the system, the air even after the operation of the apparatus left the air, and the pressure dropped. Is the automatic air vent valve (on top of the pump) not closed? It is necessary to always be ajar. It is better to bring the pressure to 2 atm. So that the expansion tank in the boiler also takes the volume and compensates for the outgoing air. In the radiators, of course, also bleed the air with a Mayevsky tap.

The gas wall-mounted boiler Bosch 6000 24 kW often gives an EA error and is often turned on and off. That is, conditionally - set it to at least 40 degrees, literally 5 minutes and turned off, etc. Previously, I warmed it up as it should, but now the first batteries are hot, the distant ones are barely warm, they do not reach them. It operates on the return temperature, there is no room thermostat.

The EA error can be eliminated by setting the fan stage to 5. The fact that the unit shuts down quickly means that its minimum power is too high for your system. He cannot give less than 8 kW. And you apparently have 5 radiators in the system. Here he heats this water and turns off. And why he heats them up so quickly, the following malfunctions are possible: something is clogged or airy, or the first radiators need to be balanced so that the entire flow does not go only through them. Here you need to look at the radiator diagram and so on. Try to set the pump speed to maximum (value 3) and bleed air into the radiators.

Tell me who knows about: Wall-hung gas boiler WBN 6000-18C RN. What kind of production tests are performed? Are they being launched?

Everything was fine with me, I don't think it was from the factory, most likely the storage was strange.

Prompt: the wall-mounted Bosch boiler has stopped, the pressure has risen to 3 bar, it has issued an error E9r. I tried to restart it, it worked, after 10 seconds. the pressure jumped to the maximum, I stopped everything, turned it off, released the pressure. I checked the gas pressure is normal, as it was. What could it be?

If the system is new, then the expansion tank is small, if the old one, then the expansion tank is faulty, or the make-up may poison. In your case, the malfunction expansion tank the most likely. If this is so, then option 2: pump up the pressure, replace the tank.

After opening the hot water tap and igniting the burner, the Bosch boiler gives an E2 error (the flow temperature sensor is faulty). This happens in 10-15 seconds. After closing the tap, the error is removed by itself, and the boiler continues to work in heating mode. If the tap is opened again, the situation is repeated. To complete the picture: An additional circulation pump is installed in the heating circuit, before its installation
the boiler and in heating mode showed an error E2 for a couple of seconds, and then changed to E9 (the heat exchanger temperature limiter was triggered). Water supply source borehole pump(pressure at the water supply from 2x to 3x without sudden surges).

Possible reasons such: its own circulation pump is faulty (if it is only used with DHW mode), the mesh filter is clogged. the sensor probably shouldn't be ruled out.

Boiler zwa 24. The concept has changed, a heat exchanger from zsa, a boiler sensor and a three-way valve are required. The payment, I think, is the same for them. In general, a single-circuit must be made from a double-circuit.

The manufacturer does not recommend doing such alterations. But if there is a desire, then you need to purchase a heat exchanger. Their supply tubes are the same, but the outlet tubes are different. On the 2-circuit there is a hole for recharge, but on the 1-circuit there is not. There are 2 options. Change the pipe. Figure out how to plug the hole. The control boards are the same.

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Boiler errors Bosch Gaz 6000

Error A7 - The hot water temperature sensor has a malfunction.

Error Ad - Boiler temperature sensor not detected.

Check the boiler sensor and connection wires.

Error C1 - The fan is rotating at a low frequency.

Check the mains voltage.

Check the flue gas outlet. Clean or repair if required.

Error C4 - The differential pressure switch does not open when the fan is not working.

Check diff. pressure switch.

Error C6 - The differential pressure switch does not close.

Check diff. pressure switch, as well as flue gas pipes.

Error C7 - The fan is not functioning.

Check the fan, wire and plug. Replace if required.

CE error - Low pressure to fill the heating system.

Top up with water.

Error d7 - There is a malfunction of the gas valve wall boiler Bosch 6000.

Check the connection wire.

Error E2 - Malfunction or breakage of the temperature sensor on the supply line.

Check the sensor for a defect, as well as a possible short circuit in its wire. Replace if required.

Error E9 - Activation of the heat exchanger temperature limiter.

Check the temperature limiter of the heat exchanger for a defect, as well as a possible short circuit in its wire. Replace if required.

Check the operating pressure in the heating system.

Check the temperature limiter, replace if necessary.

Check pump start. Replace the pump if required.

Check fuse, replace if necessary.

Remove air from the Bosch 6000 gas boiler.

Check the water circuit of the heat exchanger; if damaged, replace it.

Check the flue gas temperature limiter for a defect and a possible short circuit in its wire. Replace if required.

EA Error - Flame Not Found.

Check the connection of the protection wire.

Check the opening of the gas cock.

Check gas supply pressure. Correct the problem if necessary.

Check the connection to the electrical network.

Check electrodes and wires. Repair if necessary.

Check the flue gas outlet. Clean or repair if required.

Adjust the gas. Repair if necessary.

For natural gas: check the gas flow monitor. Correct the problem if necessary.

When using the combustion air intake from a room, check the air draft into the room and the ventilation openings.

Clean the heat exchanger.

Inspect the gas fittings. Replace if required.

Error codes for gas boilers Bosch ZSC / ZWC 24 MFA

A7 - Hot water temperature sensor defective.

Check for damage or short circuit of the temperature sensor and its wire, replace if necessary.

A8 - BUS connection interrupted.

Check connecting cable and regulators.

A9 - The hot water temperature sensor is incorrectly installed.

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

Ad - No boiler sensor detected.

Check boiler sensor and connecting cable.

b1 - Coding plug not found.

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

C1 - During the operation of the device, the differential pressure switch has opened.

Check differential pressure switch, exhaust system and connecting pipes.

C4 - Differential pressure switch in non-operating position does not open.

Check differential pressure switch.

C6 - Differential pressure switch does not close.
Check differential pressure switch and flue pipes.

d3 - No jumper detected on ST8 161

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

d4 - Too large temperature difference.

Check pump, bypass hose and system pressure.

E2 - The flow temperature sensor does not work.

Check temperature sensor and connecting cable.

E9 - The limiter in the flow line has worked.

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

EA - Bosch ZSC / ZWC boiler does not detect a flame.

Is the gas cock open? Check gas supply pressure, mains connection, starter electrode with cable and ionisation electrode with cable.

F0 - Internal fault.

Check that the electrical plug contacts and start lines are tightly connected, replace the electronic board if necessary.

F7 - Although the boiler is off, a flame is detected.

Check electrodes and cable. If the flue gas outlet works, check the electronic board for moisture.

FA - Flame detected after gas supply cut off.

Check the ionisation electrode. Check gas valve.

Fd - The button was mistakenly pressed for too long (more than 30 seconds).

Press the button again in less than 30 seconds.

CC - No outside temperature sensor detected.

Check outside temperature sensor and connecting cable for damage.

Malfunctions of gas boilers Bosch

The burner does not start

Check the operation of the emergency switch of the heating system - If necessary, switch it on.

Check operation of the control system start switch - If necessary, switch on.

Inspect the safety breakers - Check their functionality, if necessary, replace the faulty breaker.

Inspect the boiler water temperature regulator - Check and replace the defective part if necessary.

High limit safety cut-out defective - Check, replace if necessary.

An error signal appears from external safety devices (for example, from safety device control of the amount of water) - Check the heating system, eliminate errors, if necessary replace the faulty device.

The flue gas relay is tripped - AW 10: unlock the flue gas relay. AW 50: wait a maximum of 15 minutes.

The Bosch boiler will turn on automatically if there is a request for heat. In the event of repeated tripping, check the flue gas path and the function of the flue gas monitor. Replace relay if defective.

The burner ignites and shuts down due to a fault. No ignition spark

An ignition spark is heard when the ignition cable is removed - If not: replace the ignition transformer.

If yes: replace ignition electrode or ignition burner.

The burner ignites and shuts down due to a fault

Is the gas cock open? - Open the gas cock.

The supply pressure of natural gas is higher than 8 mbar - If not: Determine the cause and rectify the fault.

Is the air removed from the gas pipeline? - Remove air until gas ignition is possible.

The burner ignites and shuts down due to a fault. No ionization current

The N and L connections may have been reversed - Eliminate the error.

Check voltage between L and PE - If not: carry out PE grounding, if necessary install an isolation transformer.

Poor ionization wire contact - Correct the error, replace the defective part if necessary.

Ionisation electrode shorted to ground - Burner control defective.

Boiling sounds

Is there limescale or scale build-up in the Bosch boiler?

Purge the boiler water circuit according to the manufacturer's recommendations.

In case of constant water loss, find and eliminate the cause.

If necessary, treat the water and install a dirt trap.

Flat main flame

Are the injectors suitable for the gas supplied? - If not: install the correct nozzles.

Matching holes supply and exhaust ventilation local codes and regulations for the installation of gas equipment?

In case of insufficient air flow, the deficiency must be rectified immediately.

Harsh whistle of the burner

Are the nozzles set to the correct pressure? - Check the set value, correct if necessary.

The burner smokes

Is there any noticeable contamination in the crevices or below the slots of the burner rods? - Carry out damp cleaning of the burner as described in this manual.

Find the source of contamination and protect against further contamination.

Are the air inlet and outlet openings permanently functional? - Are there deposits or fibrous contamination on the surface of the heat exchanger?

Inspect through the cleaning holes and combustion chamber. Carry out a dry and, if required, damp cleaning of the boiler as described in this manual.

Are the burner rods damaged or deformed, are there any deformation of individual slots? - Replace burner rods, identify and eliminate the cause of the malfunction.

Information: Damage or deformation is only caused by at least one of the above faults.

Burner ignition is very loud, with strong combustion noises, you can see the flame on the nozzles

Are the correct nozzles installed? - Switch off the burner, fit a new burner rod and correct the incorrect setting for the type of gas.

Are the nozzles set to the correct pressure? - Smell of flue gases in the room where the boiler is installed.

Is the flue gas coming out of the draft breaker? - Determine the cause of the incorrect flue gas discharge and rectify the fault.

If the elimination of the cause is not immediately possible, then the burner must be turned off.

Vacuum in chimney more than 3 Pa? Blockage in the flue gas path?

Are the dimensions of the chimney correct?

Do they work in the boiler room exhaust fans removing air from the room?

This article contains all possible malfunctions and options for their elimination, as well as error codes for Bosch boilers. All information is read in next order: code - name - possible malfunction... If you have any additional questions, please leave them in the comments to this article.

If you are not 100% sure what the problem is and that you can solve it, immediately contact the service center for diagnostics and troubleshooting.

Find out the price and buy heating equipment and related products you can contact us. Write, call and come to one of the shops in your city. Delivery throughout the territory of the Russian Federation and the CIS countries.

Errors of Bosch Gaz 6000 boilers

The list below presents malfunctions specifically for Bosch Gaz 6000 series boilers. Determine the error code and eliminate the malfunctions in a timely manner.

Error code A7 - The hot water temperature sensor has a malfunction

Error code Ad - Boiler temperature sensor not detected

Check the boiler sensor and connection wires.

Error code C1 - Fan rotates at low speed

Check the mains voltage.
Check the flue gas outlet. Clean or repair if required.

Error code C4 - Differential pressure switch does not open when the fan is not working

Check diff. pressure switch.

Error code C6 - Differential pressure switch does not close

Check diff. pressure switch, as well as flue gas pipes.

Error code C7 - Fan not functioning

Check the fan, wire and plug. Replace if required.

CE error code - Low pressure to fill the heating system

Top up with water.

Error code d7 - There is a malfunction of the gas fittings of the wall-mounted boiler Bosch 6000

Check the connection wire.

Error code E2 - Malfunction or breakage of the temperature sensor on the supply line

Check the sensor for a defect, as well as a possible short circuit in its wire. Replace if required.

Error code E9 - Activation of the heat exchanger temperature limiter

Check the temperature limiter of the heat exchanger for a defect, as well as a possible short circuit in its wire. Replace if required.
Check the operating pressure in the heating system.
Check the temperature limiter, replace if necessary.
Check pump start. Replace the pump if required.
Check fuse, replace if necessary.
Remove air from the Bosch 6000 gas boiler.
Check the water circuit of the heat exchanger; if damaged, replace it.
Check the flue gas temperature limiter for a defect and a possible short circuit in its wire. Replace if required.

EA Error Code - Flame Not Found

Check the connection of the protection wire.
Check the opening of the gas cock.
Check gas supply pressure. Correct the problem if necessary.
Check the connection to the electrical network.
Check electrodes and wires. Repair if necessary.
Check the flue gas outlet. Clean or repair if required.
Adjust the gas. Repair if necessary.
For natural gas: check the gas flow monitor. Correct the problem if necessary.
When using the combustion air intake from a room, check the air draft into the room and the ventilation openings.
Clean the heat exchanger.
Inspect the gas fittings. Replace if required.

Error code F7 - Flame detection when the boiler is off

Although the boiler is off, a flame is detected.

Check the electrodes for contamination, replace if necessary.
Check the moisture content of the electronic board, dry if necessary.

Error code FA - Flame detection after gas supply cut off

A flame was detected after the gas supply was cut off.

Check gas fittings, replace if necessary.
Check electrodes and connecting wires, replace if necessary.
Check the flue gas system, clean or repair if necessary.

Error code P - Boiler type not defined

Set the boiler type.

Error code Fd - The button was mistakenly pressed for too long (more than 30 seconds)

Error codes for gas boilers Bosch ZSC / ZWC 24 MFA

Below is a list of faults specifically for Bosch boilers of the ZSC / ZWC 24 MFA series. Determine the error code and fix problems in a timely manner.

Error code A7 - Hot water temperature sensor defective

Check for damage or short circuit of the temperature sensor and its wire, replace if necessary.

Error code A8 - BUS connection interrupted

Check connecting cable and regulators.

Error code A9 - Hot water temperature sensor incorrectly installed

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

Error code Ad - No boiler sensor detected

Check boiler sensor and connecting cable.

Error code b1 - Coding plug not found

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

Error code C1 - Differential pressure switch opened during instrument operation

Check differential pressure switch, exhaust system and connecting pipes.

Error code C4 - Differential pressure switch in the inoperative position does not open

Check differential pressure switch.

Error code C6 - Differential pressure switch does not close

Check differential pressure switch and flue pipes.

Error code d3 - Jumper 161 not found on ST8

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

Error code d4 - Temperature difference too large

Check pump, bypass hose and system pressure.

Error code E2 - Flow temperature sensor does not work

Check temperature sensor and connecting cable.

Error code E9 - Flow limiter tripped

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

Error code EA - Bosch ZSC / ZWC boiler does not detect a flame

Is the gas cock open? Check gas supply pressure, mains connection, starter electrode with cable and ionisation electrode with cable.

Error code F0 - Internal malfunction

Check that the electrical plug contacts and start lines are tightly connected, replace the electronic board if necessary.

Error code F7 - Although the boiler is off, a flame is detected

Check electrodes and cable. If the flue gas outlet works, check the electronic board for moisture.

FA error code - Flame detected after gas supply cut off

Check the ionisation electrode. Check gas valve.

Error code Fd - The button was mistakenly pressed for too long (more than 30 seconds)

Press the button again in less than 30 seconds.

CC error code - Outside temperature sensor not detected

Check outside temperature sensor and connecting cable for damage.

Gas wall boilers Buderus
Logamax models U042, U044, GB072, GB172. With open and closed chamber combustion. Repair and service methods, adjustment of operating parameters. Maintenance recommendations.
Gas heating boilers Vaillant
Models: floor-standing Atmovit exclusiv, wall-mounted condensing Ecotec plus. Service, Maintenance, settings of functional components. Hydraulic diagrams.
Gas wall-mounted boilers Ariston
Clas, Clas Evo, Genus models. Recommendations for repair, maintenance and service. Elimination of errors and malfunctions. Setting and adjustment methods.
Gas boilers Immergaz
Models Eolo Star, Eolo Mini, Nike Star, Nike Mini, Metos. Repairs and adjustments. Installation, assembly and connection. Operating mode settings and additional equipment.
Kentatsu Furst boilers
Wall models Nobby Smart. Condensing Smart Condens. Floor standing Sigma, Kobold. Solid fuel Elegant, Vulkan. Malfunctions and error codes. Description and characteristics.

Bosch boiler - Errors and their meaning

Error codes for Bosch WBN 6000 boilers

A7- Malfunction of the DHW temperature sensor. Inspect the sensor for 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 boiler temperature sensor and connecting wires.

C1- The fan rotates at a low speed. Need to check the mains voltage. Also inspect the flue gas system and, if necessary, clean or repair it.

C4- No opening of the differential pressure switch if the fan is off. It is required to examine the diff. pressure switch.

C6- Differential pressure switch does not close. Check the fan and wires with plugs. Replace if required. Inspect diff. pressure switch and flue gas outlet pipes.

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

CE- There is not enough pressure in the heating system. Water is required.

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

E2- Malfunction of the temperature sensor in the supply line (interruption). It is required to check for possible damage or short circuit of the sensor and its wiring. Replace if required.

E9- The temperature limiter in the heat exchanger is triggered. It is required to check for possible damage to the temperature limiter of the heat exchanger and its connecting wires. Replace if necessary. Check the nominal system pressure. Inspect the temperature limiter and replace with a new one if necessary. Check the start of the circulation pump and, if necessary, replace it. Check fuses, replace if necessary. Remove air from the unit. Check the water circuit in the heat exchanger. Replace if necessary. Check the flue gas temperature limiter for possible damage.

EA- No flame. Check the connection of the protection wires. See if the gas cock is open. Test the supply gas pressure reading and eliminate if necessary. Check the connection to the electrical network, electrodes with wires and, if necessary, replace. Inspect the flue system, clean or repair. Check the gas regulation,
eliminate if needed. For natural gas: Inspect the gas flow switch. Change if necessary. When working with combustion air intake from the room, check the air flow into the room and the ventilation openings. Clean the heat exchanger. Check gas system, replace if necessary.

F7- When switched off, the boiler detects a flame. Check for oxidation of the electrodes, replace if necessary. Inspect the flue gas system and, if necessary, clean or repair. Check the electronic control board for moisture, dry if necessary.

FA- A flame is detected when the gas supply is turned off. Check gas system, replace if necessary. Inspect electrodes and connecting wires, replace if necessary. Inspect the flue system, clean or repair.

P- The type of boiler is not detected. Set up the unit type.

Error codes for boilers Bosch ZWC MFA

A2, C3- Flue gas outlet on the combustion chamber. Check the heat exchanger for clogging.

A3- No flue gas temperature sensor detected. The sensor and connecting cables need to be checked for damage.

A4- Flue gas outlet at the flow protector. Check the flue gas outlet.

A6- The temperature sensor in the combustion chamber is not detected. The sensor and connecting cables need to be checked for damage.

A7- Malfunction of the hot water temperature sensor (DHW). Perform a check to find defects or short circuits of the temperature sensor and its wiring, if necessary, replace.

A8- The contact with the BUS bus has been interrupted. Check the overhead cable and regulators.

A9- Incorrect installation of the DHW sensor. Check the installation distances, if necessary remove the sensor and reinstall it using heat-conducting paste.

AC- The module is not defined. The module is not connected correctly. Check the module, outside temperature sensor, remote control and contacts.

Ad- The unit cannot fix the boiler temperature sensor. It is required to inspect the boiler temperature sensor and wire contacts.

b1- No coding plug defined. Correctly insert the coding plug, measure it and replace if required.

C1, C6- Differential pressure switch does not close. Check the fan and wires with plugs. Replace if required. Inspect diff. pressure switch and flue gas outlet pipes.

C4- Dif. the pressure switch in the off position does not open. Check the differential pressure switch.

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

d3- No jumper 161 was found at ST8. If there is a jumper, insert the plug correctly, check the external stop. Otherwise: check if a jumper is present.

d4- There is a large temperature difference. Check the circulation pump, bypass hose and system pressure.

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

E2- The flow temperature sensor is defective. Check the sensor and the connection contacts.

E9- A limiter has been triggered in the flow line. Check the pressure in the system, temperature sensors. Check the functions of the pumps and the fuse on the control board, bleed the unit.

EA- No flame detected. Inspect the gas cock. Check the pressure in the gas network, the mains connection, the ignition electrode with cable and the ionization electrode with cable.

F0- Internal problem. Check the correct connection of the electrical plug contacts and the starting lines, if necessary replace the electronic board.

F7- The flame is detected when the unit is off. Check electrodes and cables. The flue gas removal system may be defective. Check control board for moisture.

FA- Flame detection after gas supply shutdown. Inspect the ionization electrode. Check the gas system.

Fd- Incorrect pressing of the button (duration is more than 30 seconds). Press the button again less than 30 seconds.

Malfunctions and adjustments of Bosch boilers

Wall mounted boiler Wbn 6000-24. The gas is natural. The EA error has been appearing for a very long time. After reading about the EA error, I decided to find out the firmware of the board and the settings of the fan stage. If the software version displays "245-03" in the menu and does not seem to raise any questions, then the menu of the fan stages shows the number "17". Horizontal chimney system with a concentric pipe. The exit from the boiler is about 2 meters. I have not installed any adapter for air intake from inside the room and the air enters the unit from outside the room. What guided the masters when they installed the 17th stage of the fan, although, judging by the instructions, the 2nd stage is needed. Do I need to change the board?

We recently flushed the heat exchangers of the Bosch 6000 gas boiler. I worked for a month and kept the pressure at 1. Then I attracted a strange babbling sound inside it before igniting the burner (in a cooling mode), as if water were being poured from one mug into another. He looked, and the pressure was 0, In theory, it should have turned off automatically when the pressure in the system dropped to 0.5, but it worked and warmed up the batteries. The only thing that appeared is a different sound and murmur. I added the pressure to 1, but the next day the pressure dropped back to 0.5 (i.e. water is leaking somewhere). I checked pipes and radiators, but found no leaks anywhere. It also does not drip from the unit, but the pressure still drops. Tell me what could be
problem and where to look for it?

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