Saunier Duval
Overheating of Control Unit
Thermostat or RF receiver becomes very warm to the touch during normal operation
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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
Installed in poorly ventilated location, Mounted above radiator or other heat source, Internal component overheating (regulator, relay), Overloaded terminals with multiple circuits
How to Fix / Troubleshooting
Safety: If the casing is too hot to touch comfortably, switch off power immediately at the isolator.
- Check location: Ensure the thermostat or receiver is not installed directly above a radiator, boiler flue, or in a cupboard with no ventilation.
- Load check: Verify that only the intended low-current control circuits are connected; do not route high loads through thermostat contacts.
- Ventilation: Provide adequate air space around the device; do not cover with curtains or furniture.
If overheating persists in a suitable location with correct wiring, the unit may be defective and should be replaced by a professional.
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Repair Difficulty
Medium
3/5
Required Part
Saunier Duval Smart Thermostat or RF Receiver Housing
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