F7
Goodman Phase Loss / Phase Protection (Three-Phase Units)

Goodman inverter or mini-split shows F7 and outdoor fan or compressor operation is abnormal

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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

Missing phase on three-phase power supply, Loose or burnt terminal connections, Incorrect phase rotation, Faulty phase protection circuit on PCB

How to Fix / Troubleshooting

Safety first: Three-phase systems carry dangerous voltages. Turn off power at the main disconnect and do not attempt live testing unless qualified.

Steps to check (visual):

  • 1. Inspect line connections: Remove the service panel on the Goodman condenser. Check that all three line conductors are securely landed and there is no evidence of overheating.
  • 2. Check fuses/breakers: Verify that all fuses in the disconnect (if used) are intact and that the three-pole breaker is not tripped on one leg.
  • 3. Power reset: After correcting any obvious issues, restore power and see if F7 clears.

When to call a professional: A technician should verify phase balance, rotation, and test the phase protection circuitry. Do not attempt to rewire three-phase power without proper training.

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Repair Difficulty

Professional Required 5/5

Required Part

Outdoor control board or line power connections
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