Junkers
Electrical Short / Earth Leakage
Furnace frequently trips external RCD or blows house fuse
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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
Water ingress into electrical components, Shorted pump or fan motor, Damaged wiring harness, Faulty control board
How to Fix / Troubleshooting
Safety first: Do not repeatedly reset an RCD that trips. Risk of electric shock or fire.
- 1. Visual inspection: With power off, inspect inside the furnace for signs of water, corrosion, or burnt wiring.
- 2. Component isolation: Disconnect suspect components (pump, fan, gas valve) one at a time and test if the RCD still trips when power is restored. This should be done by a qualified person.
- 3. Insulation testing: A technician should perform insulation resistance tests on major components to identify earth leakage.
- 4. Repair or replace: Replace any component found to be shorted or leaking to earth. Dry and seal any areas affected by water ingress.
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Repair Difficulty
Professional Required
5/5
Required Part
Circulation Pump
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