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Ideal Logic System IE fault FU

Differential greater than 50°C

Gas boiler

What it means

Flow/return temperature differential exceeds 50°C.

Likely causes

  1. Isolation valves closed
  2. Pump fault
  3. Radiator valves closed
  4. System blockages

Where to start

  1. Check isolation valves are open
  2. Check pump
  3. Check rad valves open

The full answer, free

  • 13 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 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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