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Ideal Logic System IE fault F12

Pump rotor blocked

Gas boiler

What it means

Boiler has detected the pump rotor is blocked.

Likely causes

  1. Blockage in pump rotor
  2. System not filled/vented
  3. Closed valves
  4. Excessive flow/return differential
  5. Pump not rotating freely
  6. Isolation valves closed
  7. Pump not operating
  8. Radiator valves closed
  9. System blockages
  10. Pump not operating (wiring fault or pump failure)
  11. System blockage restricting flow
  12. Thermistor fault requiring replacement
  13. Faulty or failed return thermistor requiring replacement

Where to start

  1. Verify boiler and CH system filled with water
  2. Verify all isolation, system filter and radiator valves are open
  3. Measure flow/return differential across boiler

The full answer, free

  • 35 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 System IE. Check the model on the data plate before you order parts.

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