Biasi Electrical Short / Earth Leakage

Water heater trips the household RCD or blows fuses when starting.

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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 on PCB, Shorted pump or fan motor, Damaged wiring insulation, Faulty ignition transformer

How to Fix / Troubleshooting

Safety: Do not repeatedly reset the RCD. There is a risk of electric shock or fire. Isolate power and gas.

Steps:

  • Inspect for leaks: Check inside the heater for signs of water dripping onto electrical components.
  • Visual wiring check: Look for obvious damage to cables, such as melted insulation or crushed sections.
  • Dry any moisture: If condensation or minor leaks have dampened components, allow them to dry completely after fixing the leak source.

Important: Electrical fault-finding (insulation resistance tests, component isolation) must be performed by a qualified electrician or heating technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Internal Wiring Harness or Pump/Fan Motor
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