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Worcester Bosch Greenstar 4000 Combi fault 2951

Loss of flame too many times

Gas boiler

What it means

Maximum unexpected flame losses exceeded, resulting in a lockout condition.

Likely causes

  1. Incomplete purging of gas pipe
  2. Undersized pipework
  3. Gas pressure dropping off
  4. Incorrectly routed condensate discharge
  5. Incorrect wiring

Where to start

  1. Refer to the blocking error(s) that lead to this locking error
  2. Check the fault history on appliance

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 77), right under the answer
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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 Combi. Check the model on the data plate before you order parts.

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