H4
Arctic King
Inverter Module / Compressor Drive Fault (Inverter Models)
Unit displays H4 and stops heating or cooling; may restart after a long delay.
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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
Inverter PCB failure, Shorted compressor windings, Loose high-voltage connections, Overheating of inverter module
How to Fix / Troubleshooting
Safety: Unplug the unit. Inverter circuits contain high voltages even after power is removed; only qualified persons should service inverter boards.
Steps to respond to H4:
- Visual inspection: Remove covers to access the inverter PCB (often near the compressor). Look for burnt components, discolored areas, or melted connectors.
- Check connections: Ensure all high-voltage and compressor connectors are firmly seated.
- Cooling and airflow: Make sure the inverter heat sink is not clogged with dust and that any cooling fan is operating.
- Professional service: H4 typically requires a technician to test compressor windings and inverter outputs. Replacement of the inverter PCB or compressor may be necessary.
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Repair Difficulty
Professional Required
5/5
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