P1
Fraser-Johnston
Low Refrigerant Pressure / Protection in Inverter System
P1 displayed, unit may start then shut down with no 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, Faulty low-pressure transducer, Restricted expansion device, Improper refrigerant charge
How to Fix / Troubleshooting
Safety & legal: Refrigerant-side diagnosis must be done by a certified HVAC technician.
- Visual leak check: Look for oil stains on coils and line sets.
- Airflow check: Confirm filters and coils are clean to rule out airflow-related low pressure.
- Professional service: A technician will read inverter system pressures via service ports and transducer data, locate leaks, repair, evacuate, and recharge.
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Repair Difficulty
Professional Required
5/5
Required Part
Low-Pressure Transducer
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