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Worcester Bosch Greenstar 4000 System fault 2923

Boiler electr. system fault

Gas boiler

What it means

Unexpected feedback from the modulating/current controlled gas valve.

Likely causes

  1. Faulty gas valve
  2. Faulty appliance electronics (control unit)
  3. Wiring harness fault
  4. Incorrect gas type
  5. Incorrect gas supply pressure
  6. Faulty flue system
  7. Incorrect gas/air ratio
  8. Faulty seals around the burner, internal flue seals or case seals causing abnormal O2/CO2 readings
  9. Flue system integrity failure
  10. Combustion circuit fault

Where to start

  1. Check the voltage to the gas valve
  2. Check the continuity of harness
  3. Check the resistance of the gas valve coils

The full answer, free

  • 31 more checks in order
  • The readings and component tests from the manual
  • 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 System. Check the model on the data plate before you order parts.

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