F4
Goodman Compressor Discharge Temperature Sensor Fault

Goodman inverter system shows F4 and compressor does not run

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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

Open or shorted discharge thermistor, Sensor not properly clamped to discharge line, Damaged sensor wiring, Faulty outdoor PCB sensor circuit

How to Fix / Troubleshooting

Safety first: Turn off power at the outdoor disconnect. The discharge line can be extremely hot; allow time to cool before touching.

Steps to check:

  • 1. Locate discharge sensor: Find the thermistor clipped to the small copper line leaving the compressor (discharge line) inside the Goodman condenser.
  • 2. Inspect sensor and clamp: Ensure the sensor is firmly attached to the line with its clip or strap and has not fallen off.
  • 3. Check wiring and connector: Follow the sensor wires to the PCB. Confirm the connector is fully seated and wires are not cut or pinched.
  • 4. Replace if damaged: If the sensor is cracked or wires are broken, replace it with the correct Goodman discharge temperature sensor.

When to call a professional: If F4 persists after sensor replacement, the outdoor control board may be faulty and should be tested and replaced by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Compressor discharge temperature sensor
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