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Baxi Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault E.01.04

Flame loss detected five times in 24 hours

Gas boiler

What it means

Flame loss detected five times in 24 hours (with burner on)

Likely causes

  1. Gas supply pressure issue
  2. Gas valve calibration incorrect
  3. Air intake and flue gas exhaust terminal blocked
  4. Power supply voltage issue
  5. Flue components incorrectly assembled, fixed or supported
  6. Flue or terminal obstructed
  7. Products of combustion and inlet air mixing
  8. Burner seals, internal flue seals, door or case seals unsound
  9. Carbon/soot buildup in heat exchanger
  10. Cracked or damaged burner
  11. Worn burner flange gasket
  12. Damaged front insulation panel
  13. Newly fitted gas valve not yet calibrated
  14. Gas valve out of adjustment
  15. CO2 at minimum heat input out of specified range
  16. CO2 at maximum heat input out of specified range

Where to start

  1. Check the gas supply pressure
  2. Check the gas valve calibration
  3. Check the air intake and flue gas exhaust terminal

The full answer, free

  • 67 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 Baxi manual for the Baxi 600/800/Assure System 2 and 600 Combi 2 platform. Check the model on the data plate before you order parts.

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