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Worcester Bosch Greenstar 4000 Combi fault 235

Conflicting versions of boiler electr. and boiler identification

Gas boiler

What it means

Fault category V. Conflicting versions of boiler electronics and boiler identification.

Likely causes

  1. Mismatched code plug and burner control versions
  2. Misfiring ignition transformer
  3. Incorrect gas type
  4. Incorrect gas supply pressure
  5. Power supply issue
  6. Faulty electrodes or cable
  7. Damaged or blocked flue system
  8. Incorrect gas/air ratio
  9. Faulty external gas flow monitor (natural gas)
  10. Faulty burner
  11. Faulty gas valve
  12. Faulty non-return valve in burner hood assembly
  13. Faulty seals around the burner
  14. Faulty internal flue seals
  15. Faulty case seals
  16. Flue system integrity problem
  17. Combustion circuit problem
  18. Combustion fault
  19. Cleaners containing chlorine or hydrogen halide (spray cans, primers, cleaners, paint, glue) stored or used near the appliance
  20. Build-up of dust

Where to start

  1. Check the ignition transformer function for misfiring in the Function check menu, Ignition test
  2. Check the gas type
  3. Check the gas supply pressure

The full answer, free

  • 54 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 73), 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.

Other Worcester Bosch Greenstar 4000 Combi fault codes