F0
Comfortmaker Refrigerant System Low Charge / Low Pressure Protection

Display shows F0 and unit will not start or stops shortly after starting

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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 Comfortmaker coil or line set, Undersized charge from installation, Faulty low-pressure switch or transducer, Severely restricted metering device

How to Fix / Troubleshooting

Safety: Do not attempt to connect gauges or add refrigerant unless you are EPA-certified. Turn off power before inspecting components.

Steps (visual checks only):

  • Inspect line set and coils: Look for oil stains on the indoor evaporator, outdoor condenser, and refrigerant lines, which can indicate leaks.
  • Check for ice: Frost or ice on the suction line or evaporator coil suggests low charge or airflow issues. Turn system off and allow ice to melt.
  • Verify airflow: Replace dirty filters, open closed registers, and ensure blower is operating correctly to rule out airflow-related low pressure.
  • Reset: After correcting airflow, restore power and test. If F0 returns, a refrigerant issue is likely.

Technician required: A licensed HVAC technician must locate leaks, repair them, evacuate, and recharge the Comfortmaker system to factory specifications.

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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Circuit (Leak Repair & Recharge)
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