Viessmann
Overheating or Electrical Damage in Thermostat
Thermostat emits a burning smell or becomes unusually hot to the touch.
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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
Incorrect wiring with mains voltage on low‑voltage terminals, Internal short circuit, Overloaded relay contacts, Installation in very hot environment
How to Fix / Troubleshooting
Safety first: Immediately turn off power at the breaker. Do not continue using a thermostat that smells of burning or is excessively hot.
- Inspect visually: After power is off and the device has cooled, remove the thermostat from the wall and look for signs of melting or charring.
- Do not reuse damaged unit: If any damage is visible, the thermostat must be replaced.
- Check wiring scheme: Have a qualified electrician or heating engineer verify that the thermostat is wired only to appropriate low‑voltage or control circuits as specified by Viessmann.
- Improve ventilation: Ensure the thermostat is not installed above a heat source or in a confined, unventilated space.
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Repair Difficulty
Professional Required
5/5
Required Part
Viessmann smart thermostat
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