Worcester Bosch Greenstar CDi Classic System ErP fault FA
Flame detected after gas shut off
Gas boilerWhat it means
A flame has been detected by the control system after the gas valve has been shut off, indicating a potential gas valve or wiring fault.
Likely causes
- Faulty gas valve
- Faulty wiring to gas valve
- Blocked condensation trap
- Faulty electrode assembly
- Blocked flue
Where to start
- Check gas valve and wiring to gas valve
- Clean condensation trap
- Check electrode assembly
The full answer, free
- 1 more check in order
- How to put it right, step by step
- The manual page for this fault (page 52), 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 CDi Classic System ErP. Check the model on the data plate before you order parts.