Junkers Overheating electrical component

Boiler emits smell of burning plastic or electrical overheating

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

Loose electrical connection, Overloaded PCB track, Failing pump or fan motor, Short circuit in wiring harness

Safety: Immediately switch off power to the boiler. Do not continue to operate it until inspected.

Visual inspection: After cooling, remove the front cover and look for discoloured or melted connectors, especially at the pump, fan, and PCB.
Do not ignore: Even if the smell disappears, the underlying fault can cause fire or further damage.
Technician tasks:
- Test pump and fan current draw.
- Repair or replace burnt connectors and wiring.
- Replace the main PCB if tracks or components are damaged.

Hard 4/5

Main Wiring Harness

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