Dettson Overheating Electrical Component

Boiler produces a burning or electrical smell during operation

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.

Possible Causes

Failing Dettson circulator motor, Overheating control board, Loose high-voltage connection, Shorted wiring near burner

Safety: Turn off power immediately if you smell burning plastic or see smoke. Do not continue to operate the boiler.

Visual inspection: After cooling, remove the front panel and look for discolored wiring, melted insulation, or burn marks on the control board.
Check motors: Smell near the circulator pump and combustion fan. A failing motor may be very hot to the touch (use caution).
Do not ignore: Any burning smell indicates a risk of fire. Contact a qualified technician to identify and replace the faulty component.

Hard 4/5

Dettson circulator motor

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