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Fault text on the display, description
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
2955 B
Boiler does not support the parameters set
for the hydraulic configuration
2956 O
Hydraulic configuration at the boiler
activated
2957 V
Boiler electr. system fault
2961
V
No fan signal available
2962
2963 B
The heat exchanger sensor or both supply
and heat exchanger sensors are defect
2964
Flow rate in heat exchanger too low
2965 B
Flow temperature too high
Condens 7000 WP – 6721841195 (2022/01)
Remedy
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.
Check hydraulic settings, change if necessary.
• Low-loss header
• Internal DHW circuit (cylinder charging circuit)
• Heating circuit 1
• Heating pump in appliance
–
1. Reset control device / burner control unit.
2. Reconnect electrical connections at control device / burner control unit correctly.
3. Replace the control device/burner control unit.
1. Check fan and connecting lead.
2. Check mains voltage.
1. Connect the plug to the temperature sensor correctly.
2. Connect the plug to the control device correctly.
3. Attach the temperature sensor correctly.
4. Check the temperature sensor, replace if necessary.
5. Check temperature sensor connecting lead, replace if necessary.
–
1. Ensure that the heating circulation is working correctly.
2. Check pump setting, adjust to match heating system if necessary.
3. Connect the plug to the temperature sensor correctly.
4. Connect the plug to the control device correctly.
5. Attach the temperature sensor correctly.
6. Check the temperature sensor, replace if necessary.
7. Check temperature sensor connecting lead, replace if necessary.
setting.
2
Troubleshooting
43
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