The indoor unit displays H5; the unit may not start; this is often related to IPM (inverter module) protection.

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.

Possible Causes

Shorted compressor windings, faulty inverter power module, incorrect supply voltage, loose or burnt power connections.

Safety: High-voltage inverter circuits are dangerous. Non-professionals should only perform visual checks. Always isolate the power supply.

Steps:

1. Power reset: Turn off the power for at least 30 minutes, then restore and test. If H5 returns immediately, do not continue resetting.
2. Visual inspection: Remove the outdoor panel and inspect the inverter PCB and compressor terminals for burnt marks or melted insulation.
3. Tighten terminals: With the power OFF, check that all power terminals are tight and secure.
4. Professional testing: A technician must test compressor windings, insulation resistance, and inverter output. IPM or compressor replacement may be required.

Professional Required 5/5

Outdoor Inverter PCB or Compressor

Check Price on Amazon

We may earn a commission from links on this page.