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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.04.15

Flue gas exhaust pipe blocked

Gas boiler

What it means

Permanent fault requiring reset, indicating the flue gas exhaust pipe is blocked.

Likely causes

  1. Flue components incorrectly assembled, fixed or supported
  2. Obstructed or damaged flue/terminal
  3. Products of combustion mixing with inlet air due to leaking flue joints
  4. Flue component misassembly or leakage
  5. Unsound burner, internal flue, door or case seals
  6. Incorrect combustion/gas valve setup
  7. Flue leak or blockage causing flue gas spillage

Where to start

  1. Insert measurement probe into flue gas exhaust circuit socket (A) to measure combustion exhaust gas temperature, O2 or CO2 concentration, and CO concentration.
  2. Insert measurement probe into combustion air intake circuit socket (B) approx. 7 cm to measure combustion air temperature.
  3. Activate the chimney sweep function in order to analyse the combustion exhaust gases.

The full answer, free

  • 22 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 74), 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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