F0
Tempstar
Refrigerant System Low Charge / Protection
Tempstar ductless mini-split indoor unit displays F0 and stops cooling
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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 line set or coil, Improper initial charge, Loose flare connections at indoor or outdoor unit, Faulty pressure sensor
How to Fix / Troubleshooting
Safety first: Turn OFF power to both indoor and outdoor units. Do not attempt to tighten flare fittings or connect gauges unless you are trained and certified.
Homeowner checks:
- 1. Look for oil stains: Inspect the line set connections at the Tempstar mini-split indoor and outdoor units. Oily residue can indicate a refrigerant leak.
- 2. Listen for hissing: With the system briefly powered, listen near connections for hissing sounds that may indicate a leak. Then shut power off again.
- 3. Do not run the system: Running with low refrigerant can damage the compressor.
- 4. Call a licensed HVAC technician: F0 requires leak detection, repair, evacuation, and recharging to factory specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Refrigerant Line Set
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