H5
Airwell
Inverter IPM Protection / Overcurrent
Indoor unit displays H5; unit may not start; often related to IPM (inverter module) protection.
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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 windings, Faulty inverter power module, Incorrect supply voltage, Loose or burnt power connections
How to Fix / Troubleshooting
Safety: High-voltage inverter circuits are dangerous. Only visual checks should be done by non-professionals. Always isolate power.
Steps:
- 1. Power reset: Turn off 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 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.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB or Compressor
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