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Ideal Logic System IE fault L06

False flame lockout / flame on before gas valve on

Gas boiler

What it means

Boiler detects flame signal before the gas valve has been energised, indicating a false flame detection or wiring/electrode fault.

Likely causes

  1. Internal boiler wiring routing/integrity fault
  2. Deteriorated electrode
  3. Low gas pressure
  4. Gas valve wiring/PCB fault
  5. Faulty gas valve
  6. Faulty spark generator
  7. Faulty electrode
  8. Blocked condensate/trap
  9. CO/CO2 ratio greater than 0.004 indicating combustion deposits or fouling
  10. Debris or deposits in heat engine/sump outlet
  11. Damaged electrode affecting combustion
  12. Condensate trap blockage or drying out
  13. Combustion deposits building up on heat exchanger
  14. Debris in sump outlet or condensate trap
  15. Damaged or worn electrode affecting spark gap
  16. Water or gas joint leakage

Where to start

  1. Restart the boiler and check if boiler works OK
  2. Check routing and integrity of internal boiler wiring
  3. Check condition of Electrode and replace if deteriorated

The full answer, free

  • 31 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 51), 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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