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Ideal Logic System IE fault L1

Flow temperature overheat lockout or no water flow lockout

Gas boiler

What it means

Lockout triggered by flow temperature overheat condition or lack of water flow through the boiler.

Likely causes

  1. Pump not rotating freely
  2. No water flow

Where to start

  1. Check if boiler and CH system are filled with water and all isolation/radiator valves open. If NO, fill and vent system and open all isolation valves, then restart boiler.
  2. If YES, check if Flow/Return Differential across the Boiler is in excess of 30°C. If YES, check that the pump is rotating freely.
  3. Check if differential is now below 20°C after checking pump. If NO, replace the pump then restart boiler. If YES, OK, restart boiler.

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 54), 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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