H4
Senville
Inverter Module or Compressor Drive Fault
Indoor unit displays H4; unit may not heat or cool and may shut down.
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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
Failed IPM (Intelligent Power Module) on outdoor PCB, Shorted compressor windings, Severe power surge damage, Loose high-voltage connections on PCB
How to Fix / Troubleshooting
Critical safety: This involves high-voltage inverter electronics. Only qualified personnel should service these components.
- Step 1 – Power down: Turn off breaker and outdoor disconnect. Wait at least 10 minutes for capacitors to discharge.
- Step 2 – Visual inspection: Look for burnt components or cracked modules on the outdoor PCB. Do not touch solder joints or components.
- Step 3 – Check wiring: Ensure compressor and power input terminals are tight and not burnt.
- Step 4 – Professional service: If H4 persists, the inverter PCB or compressor likely needs replacement. Contact a licensed HVAC technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB
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