TCL
Compressor Not Starting / Control Signal Failure
Unit powers on but compressor and outdoor fan never start
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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 indoor-outdoor communication cable on TCL split system, Defective outdoor main PCB, Failed compressor, Incorrect mode or temperature settings
How to Fix / Troubleshooting
Safety first: Turn OFF power before opening any covers.
- Step 1 – Confirm settings: Ensure the unit is in COOL or HEAT mode (not FAN or DRY) and the set temperature is appropriate.
- Step 2 – Listen for outdoor unit: When starting, listen outside for any click or hum. Total silence may indicate no power or PCB failure.
- Step 3 – Check communication cable: Inspect the cable between indoor and outdoor units for damage and verify terminal connections.
- Step 4 – Professional diagnosis: A technician should check for control voltage to the compressor and fan, and test the outdoor PCB and compressor.
Warning: Do not repeatedly cycle power hoping the compressor will start; this can stress electrical components.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Main Control PCB
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