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Ideal Logic System IE fault ON

Demand for heat present

Gas boiler

What it means

Display shows ON when there is a demand for heat.

Likely causes

  1. Cylinder stat not calling for heat / requires adjustment
  2. DHW timer switched off
  3. Boiler mode knob not in ON position
  4. No 230V at terminal (A) due to system controls and wiring fault
  5. Faulty wiring from terminal strip to PCB
  6. Timer and Room Thermostat or cylinder thermostat switched off
  7. Radiator valves closed
  8. No voltage from Timer/Room Stat (external wiring fault)
  9. Flue or flue terminal obstructed
  10. Seals displaced during installation, e.g. those on flue extensions
  11. No 230Vac supply to boiler at L and N
  12. Wiring from terminal block to Main PCB not connected securely
  13. Faulty PCB

Where to start

  1. Check if the cylinder stat is calling for heat
  2. Check if DHW timer is on
  3. Check if boiler mode knob is in the ON position

The full answer, free

  • 96 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 36), 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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