Saunier Duval Severe Electrical Failure / Overheating

Thermostat or RF receiver emits a burning smell or visible smoke

Advertisements

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.

Advertisements

Possible Causes

Incorrect 230 V wiring to low-voltage terminals, Internal component short circuit, Overloaded relay contacts switching high current, Ingress of conductive debris causing arcing

How to Fix / Troubleshooting

Safety: Immediately switch off power at the main isolator or breaker. Do not touch the device until it has cooled. Do not attempt to reuse a device that has emitted smoke or a strong burning smell.

  • Ventilate area: Open windows to clear any smoke.
  • Inspect from outside: Once cool, visually inspect the thermostat or receiver casing for burn marks or deformation. Do not open the casing yourself.
  • Check wiring: Have a qualified electrician or heating engineer inspect the wiring to ensure 230 V has not been applied to low-voltage circuits.

The affected Saunier Duval thermostat or receiver must be replaced. Do not power it back on.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Saunier Duval Smart Thermostat or RF Receiver (complete unit)
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements