F0
Rheem Refrigerant System Low Charge / Low Pressure Protection

Rheem inverter outdoor unit shows F0 and will not start cooling or heating.

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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 connections on line set, Undercharged system from improper installation, Faulty low-pressure sensor or transducer

How to Fix / Troubleshooting

Safety first: Refrigerant systems are sealed and require EPA-certified handling. Do not attempt to open the system yourself.

  • Visual leak check: Inspect accessible refrigerant lines, flare joints, and coils for oil stains, corrosion, or hissing sounds. Oil residue often indicates a leak.
  • Check airflow: Ensure indoor filters and outdoor coil are clean. Poor airflow can mimic low-charge symptoms but will not usually trigger F0 alone.
  • Do not add refrigerant yourself: Rheem inverter systems require precise charging by weight and often subcooling/superheat verification. Overcharging can damage the compressor.
  • Call a professional: A licensed HVAC technician should connect gauges, locate and repair leaks, evacuate, and recharge the system to Rheem specifications.

Warning: Venting refrigerant to the atmosphere is illegal and dangerous. Always use certified service.

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Repair Difficulty

Professional Required 5/5

Required Part

Rheem Refrigerant Circuit (Coils, Line Set, Low-Pressure Sensor)
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