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Worcester Bosch Greenstar 4000 Combi fault 1013

Max. combustion point reached (the maximum burner time is reached)

Gas boiler

What it means

Fault category W. Service reminder message present due to the maximum burner hours service threshold being reached.

Likely causes

  1. Maximum burner hours service threshold reached
  2. Faulty non-return valve in burner hood assembly
  3. Faulty seals around the burner
  4. Faulty internal flue seals
  5. Faulty case seals
  6. Flue system integrity problem
  7. Combustion circuit problem
  8. Combustion fault
  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. Check the non-return valve in the burner hood assembly
  2. Set boiler to maximum rate in chimney sweep mode
  3. Perform flue integrity test using analyser at air inlet sample point

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 75), 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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