Worcester Bosch Greenstar 4000 System fault 2961
No fan signal available
Gas boilerWhat it means
No fan signal detected by boiler electronics.
Likely causes
- Loss of mains voltage to fan
- Fan harness fault
- PWM fault
- Faulty fan
- Faulty PCB
Where to start
- Check the mains voltage to the fan
- Check the fan harness for continuity
- Check the pulse width modulation (PWM)
The full answer, free
- How to put it right, step by step
- The manual page for this fault (page 77), right under the answer
Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.
From the Worcester Bosch manual for the Greenstar 4000 System. Check the model on the data plate before you order parts.
Other Worcester Bosch Greenstar 4000 System fault codes
- 1010No communication via EMS BUS connection
- 1013Max. combustion point reached
- 1021Cylinder charging or hot water temperature sensor faulty
- 1022Cylinder temp. sensor faulty or contact problems
- 1037Outside temp. sensor faulty - heating backup operation active
- 1065System pressure sensor faulty or not connected
- 1068Outside temp. sensor or lambda probe faulty
- 1073Short-circuit at flow temp. sensor
- 1074No signal from flow temperature sensor
- 1075Heat exchanger temp sensor short circuit
- 1076Heat exchanger temp sensor disconnected
- 208Post-purge/pump run-on after chimney sweep mode exit
- 2085Internal fault
- 224Maximal flue gas thermostat or heat exchanger maximal thermostat has activated
- 228Flame signal without flame present
- 233Boiler identification module or device electronics faulty
- 234Gas valve electrical fault
- 235Conflicting versions of boiler electr. and boiler identification
- 237System fault
- 238Boiler electronics faulty
- 269Flame monitoring
- 281Operation of burner and fan interrupted
- 283Burner starting
- 284Opening air/gas ratio control valve/oil solenoid valves