Navien Electrical Short / Ground Fault

Navien water heater trips the circuit breaker or GFCI when it attempts to start.

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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

Shorted internal circulation pump, Shorted fan motor, Water intrusion on PCB or wiring, Damaged power cord or terminal block

How to Fix / Troubleshooting

Safety: Do not repeatedly reset a breaker that trips immediately; this indicates a potentially dangerous fault. Turn OFF power and leave it off until the issue is identified.

Steps:

  • 1. Visual inspection: Remove the front cover and look for signs of water leaks, burnt components, or melted insulation.
  • 2. Check condensate and water leaks: Repair any leaks that may be dripping onto electrical components.
  • 3. Disconnect suspect loads (technician-level): A professional can disconnect the pump or fan to isolate the shorted component.

Because of shock and fire risk, breaker-tripping faults should be handled by a qualified technician or electrician.

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Repair Difficulty

Professional Required 5/5

Required Part

Internal Circulation Pump
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