H4
Sencor
Inverter Module / Compressor Drive Protection
Display shows H4, unit may not start compressor.
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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
Faulty inverter power module on PCB, Shorted compressor windings, Poor grounding, Overvoltage or undervoltage supply
How to Fix / Troubleshooting
Safety first: This fault involves high-voltage inverter electronics. Only qualified personnel should service internal power components.
- Step 1 – Check supply voltage: Ensure the supply voltage matches the rating on the Sencor nameplate and is stable.
- Step 2 – Power reset: Turn off the breaker for 10–15 minutes to allow the inverter module to discharge, then restore power.
- Step 3 – Visual PCB inspection: With power off, inspect the outdoor PCB for burnt components or cracked solder joints around the power module.
- Step 4 – Professional diagnosis: If H4 persists, a technician should test compressor windings and the inverter module. Replacement of the outdoor PCB or compressor may be required.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter Power PCB
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