Wiser
Relay Operating but No Boiler Response
Thermostat makes clicking noises but boiler does not start
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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
Open circuit between Heat Hub and boiler, Faulty boiler room stat input, Incorrect wiring to boiler terminals, Internal boiler control fault
How to Fix / Troubleshooting
Safety first: Boiler wiring is mains voltage. Isolate power before inspecting.
- Confirm relay action: When the thermostat calls for heat, listen at the Heat Hub for a click and check any CH indicator LED.
- Inspect wiring (qualified persons only): Verify that the correct terminals on the boiler are used for external controls and that the Heat Hub’s COM/NO are wired there.
- Check for links: Some boilers require a factory link to be removed when using external controls. Confirm this has been done correctly.
- Bypass test (engineer only): Temporarily link the boiler’s control terminals to see if it fires. If it does, but not via the Heat Hub, the wiring or hub contacts may be faulty.
- Repair: Correct wiring errors or replace the Heat Hub if its relay contacts are not making a reliable connection.
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Repair Difficulty
Hard
4/5
Required Part
Wiser Heat Hub boiler call terminals
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