F0
Fraser-Johnston
Refrigerant System Low Pressure / Undercharge Protection
F0 code on display, unit 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 indoor or outdoor coil, Loose flare or braze joint on Fraser‑Johnston line set, Faulty low-pressure switch, Restriction in metering device
How to Fix / Troubleshooting
Safety & legal notice: Refrigerant work must be performed by an EPA-certified technician. Do not attempt to open the refrigerant circuit yourself.
- Visual inspection: Look for oil stains on the indoor coil, outdoor coil, and line set connections. Oil often marks a refrigerant leak.
- Check airflow: Ensure filters and coils are clean; poor airflow can mimic low pressure conditions.
- Reset power: After correcting airflow issues, power cycle the system. If F0 returns, a true low-pressure condition likely exists.
- Call a professional: A technician will connect gauges, locate leaks (using electronic detector or nitrogen pressure test), repair the leak, evacuate, and recharge the Fraser‑Johnston system to factory specifications.
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Repair Difficulty
Professional Required
5/5
Required Part
Refrigerant Line Set
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