Tosot
No Power / Power Supply Failure
Unit will not power on at all, no lights or display
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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
Tripped breaker or blown fuse, Faulty indoor power supply board, Loose power terminal connections, Faulty line cord or plug (for window/portable Tosot units)
How to Fix / Troubleshooting
Safety first: Use caution when working with mains voltage. Turn off the breaker before opening covers.
- Check power source: Verify the wall outlet or dedicated circuit has power and the breaker is not tripped. Reset if necessary.
- Inspect power cord (if applicable): For Tosot window or portable ACs, check the cord and plug for damage or burn marks. Replace if damaged.
- Check terminal block: For split systems, open the indoor unit's terminal cover and ensure L and N wires are tight.
- Inspect fuses: Some indoor PCBs have onboard fuses. Replace only with identical type and rating if blown.
- If still dead: The indoor power supply/PCB is likely faulty and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Power Supply / Main PCB
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