Saunier Duval Moisture Ingress Affecting Electronics

Condensation or visible moisture inside thermostat housing

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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

Thermostat installed in bathroom or very humid area, Mounted on cold external wall causing condensation, Water leak from above soaking wall, Inadequate IP rating for installation location

How to Fix / Troubleshooting

Safety: Turn off power to the thermostat and boiler before removing the thermostat from the wall.

  • Dry the unit: Remove the thermostat from its base and gently dry the exterior. Allow it to air-dry in a warm, dry room for at least 24 hours. Do not use a hairdryer or direct heat.
  • Investigate source: Check for water leaks, condensation on the wall, or steam sources near the thermostat.
  • Relocate: Plan to relocate the thermostat to a drier, interior wall away from bathrooms or kitchens.

If the thermostat shows erratic behavior or fails to power up after drying, internal damage has likely occurred and the unit should be replaced.

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Repair Difficulty

Medium 3/5

Required Part

Saunier Duval Smart Thermostat Housing
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