TradeAssistIQHome

Worcester Bosch Greenstar CDi Classic System ErP fault F7

Flame detected even though appliance switched off

Gas boiler

What it means

The control system has detected a flame signal while the appliance is switched off, indicating a possible false flame signal or component fault.

Likely causes

  1. Faulty electrode assembly
  2. Wet/damp PCB
  3. Blocked flue

Where to start

  1. Check electrode assembly
  2. Dry PCB
  3. Check flue is clear

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 52), right under the answer
Ask about F7 freeCreate a free account

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.

Other Worcester Bosch Greenstar CDi Classic System ErP fault codes