F0
Goodman Refrigerant System Low Charge / Undercharge Protection

Goodman inverter condenser or mini-split shows F0 and does not start 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 connections on line set, Improper initial charge or line set length not accounted for, Faulty pressure sensor or thermistor misreading low charge

How to Fix / Troubleshooting

Safety first: Do not attempt to connect gauges or add refrigerant unless you are licensed. Turn off power before removing panels.

Steps a homeowner can safely take:

  • 1. Visual inspection for oil stains: Look around the Goodman condenser, line set connections, and indoor coil area for oily residue, which can indicate a refrigerant leak.
  • 2. Check insulation on line set: Ensure the suction line (larger copper line) insulation is intact. Missing insulation can affect system performance but will not directly cause low charge; still, it should be repaired.
  • 3. Confirm indoor airflow: Replace filters and ensure vents are open to avoid misdiagnosis due to airflow issues.

When to call a professional: F0 almost always requires an HVAC technician to locate leaks, repair them, evacuate the system, and weigh in the correct Goodman-specified refrigerant charge.

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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant circuit (indoor coil, outdoor coil, line set)
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