TradeAssistIQHome

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. Faulty seals around the burner
  3. Faulty internal flue seals
  4. Faulty case seals
  5. Flue system integrity problem
  6. Combustion circuit problem
  7. Combustion fault
  8. Faulty non-return valve in burner hood assembly
  9. Cleaners containing chlorine or hydrogen halide (spray cans, primers, cleaners, paint, glue) stored or used near the appliance
  10. Build-up of dust

Where to start

  1. Set boiler to maximum rate in chimney sweep mode
  2. Perform flue integrity test using analyser at air inlet sample point
  3. Check O2 is >= 20.6% OR CO2 is < 0.2%

The full answer, free

  • 17 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
Ask about 235 freeCreate a free account

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