H5
Day & Night
Inverter Module Protection (Inverter-Driven Models)
H5 code, unit may run at limited capacity or lock out after several attempts
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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
DC inverter board overcurrent, Overheating of power module, Incorrect line voltage, Shorted compressor or fan motor on inverter circuit
How to Fix / Troubleshooting
Safety first: Inverter circuits carry high DC voltages. Turn OFF power at the disconnect and do not touch inverter components unless you are trained.
- Step 1 – Ensure ventilation: Confirm that the inverter board compartment is clean and that vents are not blocked by debris.
- Step 2 – Check line voltage: Have a qualified person verify that supply voltage is within Day & Night specifications.
- Step 3 – Visual inspection: Look for burnt components or discoloration on the inverter module.
- Professional service required: H5 typically indicates an internal inverter fault or compressor issue. Diagnosis and replacement must be performed by an experienced HVAC technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Power Module (Outdoor PCB)
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