Vokera
No power to thermostat
Thermostat display is completely blank and unresponsive
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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
Blown fuse at boiler or fused spur, Disconnected low-voltage power cable, Faulty 24V transformer or boiler low-voltage output, Internal short or failure on thermostat PCB
How to Fix / Troubleshooting
Safety first: Isolate mains power before checking fuses or wiring. Only work on low-voltage circuits if you are competent.
- Check fused spur: Ensure the boiler's fused spur is switched on and the fuse has not blown. Replace with the correct rating if necessary.
- Verify boiler operation: Confirm that the boiler display is on. If the boiler itself is dead, resolve that issue first.
- Inspect thermostat wiring: Remove the thermostat from its wall plate and check that the power terminals have firmly connected wires.
- Measure voltage: If you have a multimeter and are competent, measure the voltage at the thermostat power terminals. Compare with the specified range in the manual.
- Test with spare thermostat: If power is present but the display remains blank, the thermostat is likely faulty and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Vokera smart thermostat
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