H4
TCL
Inverter Module / Drive Error
Display shows H4 and unit will not run normally
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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
IGBT module failure on outdoor PCB, Short circuit in compressor, Power surge damage to inverter board, Poor grounding of outdoor unit
How to Fix / Troubleshooting
Safety first: Turn OFF and lock out power. Inverter circuits can retain high voltage.
- Step 1 – Visual inspection: Check the outdoor PCB for burn marks, cracked components, or a burnt smell.
- Step 2 – Grounding check: Ensure the outdoor unit is properly grounded according to local codes.
- Step 3 – Do not bypass protection: Do not attempt to jumper or bypass safety circuits to force operation.
- Step 4 – Professional repair: The inverter board or compressor must be tested and replaced by a qualified technician using TCL-approved parts.
Warning: Inverter repairs are complex and dangerous; this is not a DIY repair.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Inverter PCB
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