F0
Westinghouse Refrigerant System Low Charge / Protection

Unit displays F0 and stops cooling; may restart after power cycle but fault returns.

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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, factory undercharge, blocked capillary or expansion device causing abnormal pressures

How to Fix / Troubleshooting

Safety: Refrigerant is under high pressure and must only be handled by licensed personnel. Do not attempt to open the refrigerant circuit yourself.

User-level checks:

  • Airflow: Ensure indoor and outdoor coils are clean and filters are not blocked. Poor airflow can mimic low-charge symptoms.
  • Visual inspection: Look for oil stains on refrigerant lines, coils, and connections, which can indicate a leak.
  • Listen for hissing: With the unit off, listen near joints and coils for any obvious hissing that might indicate a leak.
  • Reset: Power the unit off for 10 minutes, then restart. If F0 returns quickly, a refrigerant issue is likely.

Professional service required: A licensed HVAC technician must locate and repair leaks, evacuate the system, and recharge with the correct type and amount of refrigerant specified by Westinghouse.

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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Circuit (Coils and Line Set)
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