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Baxi Baxi 200/400/600/800 Combi 2 & System 2 Baxi 600/800/Assure System 2 and 600 Combi 2 platform fault E.01.04

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

Gas boiler

What it means

Permanent fault requiring reset, triggered when flame loss is detected five times within a 24 hour period while the burner is on.

Likely causes

  1. Gas supply issue
  2. Gas valve calibration issue
  3. Flue gas exhaust/air intake blockage
  4. Power supply voltage issue
  5. Faulty or unsound burner seals
  6. Faulty or unsound internal flue seals
  7. Faulty or unsound door or case seals
  8. Incorrect gas valve setup or combustion calibration
  9. Burner surface cracks or damage
  10. Worn burner flange gasket
  11. Front insulation panel cracked, damaged, moist, aged or deformed
  12. Dust/dirt residue accumulation in combustion chamber

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

  • 29 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 Baxi manual for the Baxi 200/400/600/800 Combi 2 & System 2 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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