Bosch Condens 8300i W Installation And Maintenance Instructions Manual page 47

Fault text on the display, description
228 V Flame signal without flame present
229 B Flame failed during burner operation
232 B Boiler locked by external switching contact 1. Connect the plug for the external switching contact.
233 V Boiler identification module or device
electronics faulty
234 V Gas valve electrical fault
235 V Conflicting versions of boiler electr. and
boiler identification
237 V System fault
238 V Boiler electronics faulty
242 - V System fault boiler electronics / basic
263 controller
265 B Heat demand lower than energy supplied
268 O Relay test was activated
269 V Flame monitoring
273 B Operation of burner and fan interrupted
281 B Pump stuck or running in air
306 V Flame signal after closing the fuel supply
358 O Anti-seizing functn. active
360 V System fault boiler electronics / basic
controller
362 V Boiler identification module or boiler
electronics faulty
363 V System fault boiler electronics / basic
controller
Condens 8300i W – 6721841533 (2022/12)
Remedy
1. Check ionisation cable, replace if necessary.
2. Check electrode set, replace if necessary.
3. Replace the control device.
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.
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.
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).
1. Replace connecting lead and reset once replacement is complete.
2. Replace air/gas ratio control valve and reset once replacement is complete.
1. Check boiler identification module/coding plug.
2. Install valid combination of control device/burner control unit.
1. Replace boiler identification module/coding plug.
2. Replace control device/burner control unit.
Replace control device.
1. Remedy contact problem.
2. If necessary, replace control device or boiler identification module/coding plug (Bosch
contact customer service).
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Replace control device/burner control unit.
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1. Check whether the pump is blocked, unblock or replace if necessary.
2. Ensure that the heating water can circulate correctly.
3. Vent the pump.
1. Replace the air/gas ratio control valve.
2. Replace the ionisation cable.
3. Replace the control device/burner control unit.
–
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).
Replace boiler identification module/coding plug (Bosch contact customer service).
Replace control device/burner control unit.
Troubleshooting
47