H5
Fujitsu Outdoor Unit Capacity Control or Expansion Valve Error

Indoor unit shows H5, unit may not operate in certain modes or capacities

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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

Stuck electronic expansion valve (EEV), Faulty EEV coil or stepper motor, Wiring fault between PCB and EEV, Outdoor PCB control error

How to Fix / Troubleshooting

Safety first: Turn off power at the outdoor disconnect. The expansion valve is part of the sealed refrigerant circuit; do not attempt to open it.

  • Listen for EEV operation: When the system starts, a technician may listen closely for clicking or buzzing from the EEV, indicating movement.
  • Check wiring: Inspect the EEV coil wiring harness and connector for damage or loose connections.
  • Technician tasks:
    • Test EEV coil resistance and stepper function.
    • Check for proper valve operation via service mode.
    • Replace the EEV assembly or outdoor PCB if confirmed faulty.
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Repair Difficulty

Professional Required 5/5

Required Part

Electronic Expansion Valve (EEV)
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