Junkers Electrical short or earth leakage

Boiler frequently trips the household circuit breaker or RCD

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

Water ingress into electrical components, Shorted pump or fan motor, Damaged wiring insulation, Faulty PCB

Safety: Do not repeatedly reset a tripping breaker; risk of fire or electric shock.

Visual inspection: Look for signs of leaks inside the boiler, especially around the pump, automatic air vent, and heat exchanger connections.
Drying: If water is present, fix the leak and allow components to dry fully before re-energising.
Technician tests:
- Insulation resistance testing of pump, fan, and wiring.
- Isolation of components to identify the faulty circuit.
- Replacement of the defective component or PCB.

Professional Required 5/5

Circulation Pump

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