H5
Tristar IPM / Inverter Module Protection

Unit displays H5 and will not start compressor; fans may still operate.

Advertisements

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.

Advertisements

Possible Causes

Faulty inverter power module on outdoor PCB, Shorted compressor windings, Poor cooling of inverter heat sink, Loose high-current connections on outdoor board

How to Fix / Troubleshooting

Safety first: Turn off power at the main breaker. Inverter circuits store high voltage; do not touch capacitors or power components without proper training.

User-level checks:

  • Visual inspection: Look through the outdoor panel (if visible) for burnt smells or obvious damage. Do not probe the board.
  • Ensure ventilation: Confirm the outdoor unit is not obstructed and that its internal fan is working to cool the electronics.

Technician-required: A qualified technician must test the inverter module, compressor windings, and DC bus, and replace the outdoor inverter PCB or compressor as needed.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Outdoor Inverter Control PCB
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements