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Worcester Bosch Greenstar 4000 Combi fault 2916

Boiler electr. system fault (gas valve detected open during post-purge)

Gas boiler

What it means

Gas valve was detected as open during post-purge cycle.

Likely causes

  1. Faulty gas valve
  2. Faulty PCB
  3. Incorrect gas type
  4. Incorrect gas supply pressure
  5. Damaged or blocked flue system
  6. Incorrect gas/air ratio
  7. Misfiring ignition transformer
  8. Power supply issue
  9. Faulty electrodes or cable
  10. Faulty external gas flow monitor (natural gas)
  11. Faulty burner
  12. Faulty seals around the burner
  13. Faulty internal flue seals
  14. Faulty case seals
  15. Combustion fault
  16. Restricted gas supply
  17. Livestock stables or storage rooms for fertilisers near appliance
  18. Permanent ammoniac concentration in installation area

Where to start

  1. Carry out a gas tightness test on the gas valve
  2. Check the voltage to gas valve
  3. Check the gas type

The full answer, free

  • 49 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 Combi. Check the model on the data plate before you order parts.

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