Salus No Power to Thermostat

Thermostat display completely blank; heating does not respond.

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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 in fused spur, Tripped circuit breaker, Loose live/neutral at thermostat backplate, Failed internal power supply on thermostat PCB

How to Fix / Troubleshooting

Safety first: This involves mains voltage. Isolate power at the consumer unit and verify the circuit is dead before removing covers.

Steps to check:

  • Check fused spur: For wired Salus thermostats and receivers, inspect the fused connection unit near the boiler. Replace a blown 3A fuse with the same rating if necessary.
  • Verify breaker: Ensure the heating/boiler circuit breaker is ON. Reset if tripped and monitor for re-tripping, which indicates a fault.
  • Inspect backplate wiring: Remove the thermostat head and check that live (L) and neutral (N) are firmly connected and not loose or broken.
  • Test voltage: With power restored and using a multimeter, confirm that correct mains voltage is present at the thermostat terminals. If voltage is present but the display is blank, the thermostat is likely faulty.

Resolution: Restore correct power supply and replace the thermostat head if it remains dead with confirmed voltage at the terminals.

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Repair Difficulty

Medium 3/5

Required Part

Salus thermostat head
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