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Fault text on the display, description
2927 B
No flame detected after ignition
2928 V
Internal fault
2931 V
System fault boiler electronics / basic
controller
2940 V
System fault burner control unit
2946 V
Incorrect code plug detected
2948 B
No flame signal with low output
2949 B
No flame signal with high output
2950 B
No flame signal following starting procedure Burner starts automatically after purging.
2951 V
Loss of flame too many times
2952 V
Internal fault when testing the ionisation
signal
Condens 7000 WP – 6721842519 (2022/03)
Remedy
1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Interrupt the power supply of the appliance and check the gas line.
4. Carry out function check for ignition.
5. Carry out function check for ionisation.
6. Connect the plug for the ionisation and ignition sections correctly.
7. Establish protective conductor connection (PE) in the control device.
8. Check flame sense electrode, replace if necessary.
9. Check ignition electrode, replace if necessary.
10.Check ignition electrode connecting lead, replace if necessary.
11.Replace the connecting lead to the flame sense electrode.
12.Set the burner correctly/replace the burner nozzles.
13.Set the burner at minimum rated load.
14.Check air/gas ratio control valve, replace if necessary.
15.Check the flue system and repair if necessary.
16.The interconnected room air supply is too small or the size of the ventilation opening
is too small.
17.Clean the heating block on the flue gas side.
18.Check control device/burner control unit, replace if necessary.
1. Perform reset.
2. Replace control device/burner control unit.
1. Perform reset.
2. Replace control device/burner control unit.
1. Perform reset.
2. Replace control device/burner control unit.
Replace boiler identification module/coding plug (Bosch contact customer service).
Burner starts automatically after purging.
If this fault occurs frequently, check CO
The burner is automatically restarted following purging.
1. Check burner gaskets, replace if required.
2. Reduce output.
Set gas/air ratio correctly.
1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Interrupt the power supply of the appliance and check the gas line.
4. Carry out function check for ionisation.
5. Connect the plug for the ionisation and ignition sections correctly.
6. Establish protective conductor connection (PE) in the control device.
7. Check flame sense electrode, replace if necessary.
8. Check ignition electrode, replace if necessary.
9. Check ignition electrode connecting lead, replace if necessary.
10.Check flame sense electrode connecting lead, replace if necessary.
11.Set the burner correctly/replace the burner nozzles.
12.Set the burner at minimum rated load.
13.Check air/gas ratio control valve, replace if necessary.
14.Check the flue system and repair if necessary.
15.The interconnected room air supply is too small or the size of the ventilation opening
is too small.
16.Clean the heating block on the flue gas side.
17.Check control device/burner control unit, replace if necessary.
1. Perform reset.
2. Replace control device/burner control unit.
setting.
2
Troubleshooting
43
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