Bosch Condens 7000 WP - Page 40

Troubleshooting
Condens 7000 WP – 6721842519 (2022/03)
40
227 V No flame signal after ignition 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. Check the supply pressure of the gas line.
5. Check that the burner is working correctly, adjust burner if necessary.
6. Check CO
2
content of combustion air, adjust if necessary.
7. Establish protective conductor connection (PE) in the control device.
8. Carry out function check for ignition.
9. Carry out function check for ionisation.
10.Connect the plug for the ionisation and ignition sections correctly.
11.Connect the plug for the air/gas ratio control valve correctly.
12.Check condensate pipes.
13. Check flue gas side of heat exchanger for pollution.
14.Check flame sense electrode, replace if necessary.
15.Check ignition electrode, replace if necessary.
16.Check ignition electrode connecting lead, replace if necessary.
17.Check flame sense electrode connecting lead, replace if necessary.
18.Check air/gas ratio control valve, replace if necessary.
19.Check control device/burner control unit, replace if necessary.
228 V Flame signal without flame present 1. Check ionisation cable, replace if necessary.
2. Check electrode set, replace if necessary.
3. Replace the control device.
229 B Flame failed during burner operation 1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Shut down the device and check the gas line.
4. Signal evaluation on printed circuit board defective.
5. Replace flame sense electrode.
6. Establish protective conductor connection (PE) in the control device.
7. Replace ignition cable.
8. Replace the connecting lead to the flame sense electrode.
9. Replace air/gas ratio control valve.
10.Set the burner correctly or replace the burner nozzles.
11.Set the burner at minimum rated load.
12.Convert the flue system.
13.The interconnected combustion air supply is too low or the ventilation opening is too
small.
14. Clean the heating block on the flue gas side.
15.Replace control device/burner control unit.
232 B Boiler locked by external switching contact 1. Connect the plug for the external switching contact.
2. Install jumper/check condensate pump according to manufacturer's specifications.
3. Adapt switching point of the external temperature switch to the system.
4. Replace connecting lead to the external temperature switch.
5. Replace external temperature switch.
233 V Boiler identification module or device
electronics faulty
1. Install boiler identification module/coding plug.
2. Connect plug to boiler identification module/coding plug.
3. Replace boiler identification module/coding plug (Bosch contact customer service).
234 V Gas valve electrical fault 1. Replace connecting lead and reset once replacement is complete.
2. Replace air/gas ratio control valve and reset once replacement is complete.
235 V Conflicting versions of boiler electr. and
boiler identification
1. Check boiler identification module/coding plug.
2. Install valid combination of control device/burner control unit.
237 V System fault 1. Replace boiler identification module/coding plug.
2. Replace control device/burner control unit.
238 V Boiler electronics faulty Replace control device.
242 -
263
V System fault boiler electronics / basic
controller
1. Remedy contact problem.
2. If necessary, replace control device or boiler identification module/coding plug (Bosch
contact customer service).
265 O Heat demand lower than energy supplied –
Fault code Fault category
Fault text on the display, description Remedy