F5
Goodman
Evaporator Coil Temperature Sensor Fault (Indoor)
Goodman inverter or mini-split shows F5 and unit stops during operation
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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
Failed indoor coil thermistor, Loose or corroded sensor connector, Sensor not in proper contact with coil, 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. Access evaporator coil: Remove the front cover and filters of the Goodman indoor unit to expose the coil area.
- 2. Locate coil sensor: Find the thermistor clipped to the evaporator tubing. It may be near the center or outlet of the coil.
- 3. Check attachment: Ensure the sensor is firmly clipped to the coil and has not slipped off or is hanging in free air.
- 4. Inspect wiring: Follow the sensor wires to the PCB and verify the connector is secure and wires are intact.
- 5. Replace if necessary: If the sensor is damaged, replace it with a Goodman-compatible evaporator thermistor.
When to call a professional: If F5 remains after sensor replacement, the indoor control board may require professional diagnosis and replacement.
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Repair Difficulty
Medium
3/5
Required Part
Indoor evaporator temperature sensor
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