H2
TCL
Defrost Protection / Outdoor Coil Overheat (model-dependent)
Display shows H2 and heating performance is poor
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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 defrost sensor, Outdoor coil temperature abnormal, Defrost control malfunction, Blocked outdoor coil
How to Fix / Troubleshooting
Safety first: Turn OFF power before cleaning the outdoor unit.
- Step 1 – Clean outdoor coil: Remove debris and wash the coil gently.
- Step 2 – Check defrost sensor: A technician should inspect and test the defrost sensor attached to the outdoor coil and replace if out of spec.
- Step 3 – Verify fan operation: Ensure the outdoor fan runs correctly in HEAT mode.
- Step 4 – PCB diagnosis: If H2 persists, the outdoor PCB defrost control may be faulty and require replacement.
Warning: Incorrect defrost operation can severely reduce heating capacity and stress the compressor.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Temperature Sensor
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