F0
Tosot
Low Refrigerant / Refrigerant Leakage Protection
Unit displays F0 and stops cooling, may restart after power cycle
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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
Refrigerant leak in indoor coil, Refrigerant leak in outdoor coil or flare connections, Factory undercharge, Faulty low-pressure or temperature sensing
How to Fix / Troubleshooting
Safety first: Do not attempt to open the refrigerant circuit without proper certification.
- Visual inspection: Look for oil stains on flare connections, indoor coil connections, and outdoor coil. Oil residue often indicates a refrigerant leak.
- Check airflow: Ensure filters and coils are clean to rule out airflow-related low temperature issues.
- Power reset: Turn off power for 10 minutes, then restart. If F0 returns quickly, the system likely has a low refrigerant condition.
- Call a licensed technician: A professional must locate the leak, repair it, evacuate the system, and recharge with the exact Tosot-specified refrigerant charge.
Warning: Operating with low refrigerant can damage the compressor.
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Repair Difficulty
Professional Required
5/5
Required Part
Refrigerant Circuit (Indoor/Outdoor Coils and Line Set)
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