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Ideal Logic System IE fault L0C

Repeated restart lockout

Gas boiler

What it means

If Restart occurs 5 times within 15 minutes following an L02 lockout, the boiler displays L0C, indicating a persistent ignition failure requiring further investigation.

Likely causes

  1. Repeated ignition failures
  2. Restart attempted 5 times within 15 minutes
  3. Repeated failure to establish ignition after multiple restart attempts within a short time period
  4. Flue components not correctly assembled, fixed or supported
  5. Flue or flue terminal obstruction
  6. Displaced seals on flue extensions
  7. Combustion products and inlet air mixing due to flue leakage
  8. Incorrect gas type or gas supply pressure/rate not verified prior to commissioning
  9. Incorrect gas rate/pressure
  10. Poor combustion
  11. Air/gas ratio valve fault
  12. Flue restriction or leakage
  13. CO/CO2 ratio greater than 0.004 indicating combustion deposits or fouling

Where to start

  1. Count number of restarts within 15 minute window
  2. Investigate underlying cause of repeated ignition failure rather than continuing to restart
  3. Set external controls to OFF - burner should go off and pump continue running for two minutes

The full answer, free

  • 49 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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