Hitachi Electrical Overcurrent / Short Circuit

Unit trips the circuit breaker 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

Shorted compressor or fan motor, Shorted wiring or terminals, Faulty inverter module, Undersized breaker or shared circuit overload

How to Fix / Troubleshooting

Safety first: Repeated breaker tripping is a serious electrical issue. Do not keep resetting the breaker.

Steps:

  • Check for obvious damage: With power OFF, inspect indoor and outdoor wiring for burnt insulation or loose wires.
  • Dedicated circuit: Ensure the AC is on a dedicated circuit with correct breaker size.

Do not: Attempt to open compressor terminals or inverter modules. Contact a qualified technician to test insulation resistance and current draw.

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Repair Difficulty

Professional Required 5/5

Required Part

Compressor / Outdoor Inverter PCB / Wiring Harness
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