Drayton
No Heat Demand Output from Thermostat System
Thermostat appears to work but boiler never fires for heating demand.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed relay in Drayton receiver, Broken switched live wire to boiler, Incorrect wiring at wiring centre, Thermostat not paired to receiver
How to Fix / Troubleshooting
Safety first: This involves mains voltage. Isolate power at the consumer unit before opening any wiring centres or receivers.
- Check receiver status: Observe the Drayton receiver (e.g. SCR, Heat HubR). When heat is demanded, the heating LED should light and a relay click should be heard. If not, re-pair the thermostat to the receiver following Drayton instructions.
- Verify wiring: Inspect the wiring from the receiver’s heating output (COM/NO) to the boiler’s call-for-heat terminals. Tighten loose screws and repair damaged cables.
- Bypass test: With power off, temporarily link the boiler’s call-for-heat terminals at the wiring centre. Restore power briefly to confirm the boiler fires. If it does, the issue is between the receiver and wiring centre.
- Replace receiver: If wiring is correct and the receiver does not switch the output under demand, replace the Drayton receiver or Heat HubR.
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Repair Difficulty
Hard
4/5
Required Part
Drayton Receiver / Heat Hub Relay Module
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