F1
Goodman Indoor Ambient Temperature Sensor Fault

Goodman inverter system displays F1 and shuts down

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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 room temperature thermistor, Disconnected sensor harness, Sensor not properly located in return air stream, Faulty indoor PCB sensor circuit

How to Fix / Troubleshooting

Safety first: Turn off power to the indoor unit at the breaker.

Steps to check:

  • 1. Locate room sensor: On many Goodman mini-splits, the room thermistor is behind the front grille near the air intake. Carefully remove the cover to access it.
  • 2. Inspect wiring: Ensure the thermistor leads are intact and the connector is firmly plugged into the PCB.
  • 3. Check sensor placement: The sensor should be in the return air path, not touching metal surfaces that could skew readings. Reposition if necessary.
  • 4. Replace sensor if damaged: If the sensor is physically damaged or corroded, replace it with a Goodman-compatible room thermistor.

When to call a professional: If a new sensor does not resolve F1, the indoor PCB may be defective and should be replaced by a technician.

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Repair Difficulty

Medium 3/5

Required Part

Room temperature thermistor
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