Worcester Bosch Greenstar 4000 System fault 1074
No signal from flow temperature sensor
Gas boilerWhat it means
Service warning (W category) indicating no signal received from the flow temperature sensor.
Likely causes
- Disconnected sensor plug
- Faulty flow temperature sensor
- Harness continuity fault
- Faulty PCB
Where to start
- Check the flow temperature sensor plug is connected
- Check the resistance of the flow temperature sensor
- Check the continuity of harness
The full answer, free
- 6 more checks in order
- How to put it right, step by step
- The manual page for this fault (page 75), 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
- 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
- 2910Fault in flue system