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Ideal Logic System IE fault F0T

Room thermostat fault

Gas boiler

What it means

Boiler has detected a fault with the room thermostat or its connections.

Likely causes

  1. Faulty room thermostat
  2. Faulty room thermostat connections
  3. Faulty room thermostat wiring/connections
  4. Boiler mode set to Off on display
  5. CH Timer or Room Thermostat switched off
  6. Radiator valves closed
  7. No voltage supplied from Timer/Room Stat wiring (external fault)
  8. Missing link wire across OpenTherm connections when no OpenTherm Room Stat connected
  9. No 230V at SL2 IN when Outside Sensor connected
  10. Faulty wiring from terminal strip to PCB
  11. No voltage supplied from Timer/Room Stat to SL1 IN (external wiring fault, not boiler fault)

Where to start

  1. Check Room Stat & connections
  2. Check if 'Off' is shown underneath the tap on the display
  3. Check if CH Timer and Room Thermostat are switched on

The full answer, free

  • 12 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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