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Ideal Logic fault L1

Flow temperature overheat lockout

Gas boiler

What it means

Boiler has shut down due to flow temperature exceeding safe limits

Likely causes

  1. System not filled with water
  2. Isolation or radiator valves closed
  3. Pump not rotating freely
  4. Flow/Return differential exceeds 30°C
  5. Flow thermistor fault

Where to start

  1. Verify boiler and CH system filled with water
  2. Confirm all isolation and radiator valves open
  3. Check pump rotation freely

The full answer, free

  • 2 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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