Ideal
Control Signal Failure
Boiler does not respond to room thermostat or programmer, stays off
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Possible Causes
Flat batteries in wireless thermostat, Faulty Ideal Halo or other control, Broken wiring between control and boiler, Incorrect control settings (holiday/off mode)
How to Fix / Troubleshooting
Safety first: Isolate power before handling wired controls.
User checks:
- Thermostat batteries: Replace batteries in wireless thermostats and re-pair if necessary.
- Programmer settings: Ensure heating and hot water are set to ON or timed, not OFF.
- Manual boiler control: Increase the boiler's own thermostat and check if it fires when there is a demand.
If the boiler still does not respond, an engineer should test control circuits and replace faulty controls or repair wiring.
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Repair Difficulty
Easy
2/5
Required Part
Room Thermostat
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