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Ideal Logic System IE fault L02

Ignition lockout after 5 attempts

Gas boiler

What it means

Boiler fails to light after 5 ignition attempts and locks out, displaying fault code L02.

Likely causes

  1. Boiler did not light within 5 ignition attempts
  2. Failure to establish burner flame after repeated ignition attempts
  3. Flue components not correctly assembled, fixed or supported
  4. Flue or flue terminal obstruction
  5. Displaced seals on flue extensions
  6. Combustion products and inlet air mixing due to flue leakage
  7. Incorrect gas type or gas supply pressure/rate not verified prior to commissioning
  8. Incorrect gas rate/pressure
  9. Poor combustion
  10. Air/gas ratio valve fault
  11. Flue restriction or leakage
  12. CO/CO2 ratio greater than 0.004 indicating combustion deposits or fouling

Where to start

  1. Check ignition sequence completes
  2. Press Restart Button (E) to repeat ignition sequence
  3. Check gas supply and ignition components if lockout persists

The full answer, free

  • 50 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 31), 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 System IE. Check the model on the data plate before you order parts.

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