Thermona
Electrical Overheating / Component Failure
Boiler emits a burning smell or visible smoke from the casing.
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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
Overheated Thermona PCB, Shorted wiring harness, Seized fan or pump drawing excessive current, Foreign object inside casing
How to Fix / Troubleshooting
Critical safety: Immediately switch off the boiler at the mains isolator. Do not continue to operate the appliance.
- Disconnect power: Turn off the circuit breaker or remove the fuse supplying the boiler.
- Do not open if smoke is heavy: Wait until smoke dissipates and components cool before any inspection.
- Visual inspection (engineer level): A technician should inspect the Thermona PCB, wiring, fan, and pump for burn marks or melted insulation, and replace damaged components.
- Check supply and fusing: Ensure correct fuse rating and that no unauthorised modifications have been made to the wiring.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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