Salus Overheating / Component Failure

Thermostat emits a burning smell or shows visible scorch marks.

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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

Overloaded relay contacts, Loose terminal causing arcing, Internal short circuit, Incorrect wiring of high-current load through thermostat

How to Fix / Troubleshooting

Safety first: Immediately switch off power at the consumer unit and do not use the thermostat until inspected. Risk of fire or electric shock.

Steps to check:

  • Inspect externally: Look for discoloration, melted plastic, or soot around the thermostat or receiver.
  • Remove cover: With power off, carefully remove the thermostat or receiver front and inspect terminals and PCB for burnt areas.
  • Check load rating: Confirm that the connected boiler, pump, or valve does not exceed the thermostat's maximum switching current. High-current loads should be switched via a separate contactor or relay.

Resolution: Do not attempt to repair a burnt thermostat. Replace the Salus unit and correct any wiring or load issues that caused the overheating. Consider having a qualified electrician inspect the circuit.

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Repair Difficulty

Professional Required 5/5

Required Part

Salus thermostat or receiver assembly
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