Tado
Overheating of Relay or Terminal Block
Tado Smart Thermostat backplate or Extension Kit feels warm or has a faint burning smell.
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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
Loose high-current connections at relay terminals, Undersized wiring for load, Relay contacts arcing, Internal component failure
How to Fix / Troubleshooting
Safety warning: This may indicate a fire risk. Immediately switch off power to the boiler and Tado controls at the breaker.
- Do not continue use: Leave the system powered off until inspected.
- Inspect visually: Remove the thermostat or Extension Kit cover and look for discoloration, melted plastic, or burnt insulation around the terminals.
- Do not attempt repair: If any signs of overheating are present, the device should be replaced. Do not attempt to repair the relay or PCB yourself.
- Check wiring size: Have a qualified electrician or heating engineer verify that the wiring gauge and connections are appropriate for the load.
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Repair Difficulty
Professional Required
5/5
Required Part
Tado Extension Kit Relay Board
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