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Worcester Bosch Greenstar 4000 Combi fault 2915

Boiler electr. system fault (fan keeps running after post purge)

Gas boiler

What it means

The fan continues running after the post-purge cycle has completed, indicating fan control or PCB fault.

Likely causes

  1. Faulty fan
  2. Damaged fan harness
  3. Incorrect power modulation on fan
  4. Defective PCB

Where to start

  1. Reset the appliance
  2. Create a heat demand to test the boiler's ignition sequence
  3. Check the voltage to the fan and the continuity of the fan harness

The full answer, free

  • 5 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 76), 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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