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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 PC002

Number of burner start-ups for heating and DHW mode

Gas boiler

What it means

Installer-level counter showing total number of burner start-ups for both heating and domestic hot water modes combined.

Likely causes

  1. Faulty or unsound burner seals
  2. Faulty or unsound internal flue seals
  3. Faulty or unsound door or case seals
  4. Incorrect gas valve setup or combustion calibration
  5. Burner surface cracks or damage
  6. Worn burner flange gasket
  7. Front insulation panel cracked, damaged, moist, aged or deformed
  8. Dust/dirt residue accumulation in combustion chamber

Where to start

  1. With boiler still operating at maximum rate, insert the analyser probe into the flue gas test point, allow reading to stabilise
  2. Check if CO < 350ppm and CO/CO2 ratio < 0.004
  3. If not within range, verify integrity of seals: check all burner seals, internal flue seals, door & case seals, replace any unsound seals

The full answer, free

  • 25 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 60), 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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