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Ideal Logic fault F2

Flame loss

Gas boiler

What it means

Boiler ignites briefly then flame is lost during operation

Likely causes

  1. Gas pressure below 18 mbar at boiler inlet
  2. Detection electrode fault or contamination
  3. Condensate pipe blocked
  4. Flue blocked
  5. Spark generator fault
  6. Ignition electrode fault
  7. Gas valve fault
  8. Siphon or condensate drain blockage

Where to start

  1. Check gas pressure at boiler inlet (minimum 18 mbar)
  2. Inspect detection electrode for continuity, visual condition and position
  3. Check condensate pipe for blockage

The full answer, free

  • 5 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 49), 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 Ideal manual for the Logic. Check the model on the data plate before you order parts.

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