F2
Carrier
Evaporator Pipe Temperature Sensor (T3) Fault
Indoor unit shows F2 and unit may short cycle or not reach set temperature
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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 pipe thermistor, Sensor not properly attached to refrigerant tube, Damaged sensor harness, Indoor PCB sensor input failure
How to Fix / Troubleshooting
Safety: Disconnect power before accessing internal components.
- Step 1 – Access piping sensor: Remove the indoor cover and locate the thermistor clipped to the refrigerant tubing near the evaporator outlet.
- Step 2 – Verify attachment: Ensure the sensor is firmly clipped and insulated as originally installed. Re-secure if loose.
- Step 3 – Inspect wiring: Check for nicks, pinches, or loose connectors. Reseat the connector on the PCB.
- Step 4 – Replace sensor: If F2 remains, replace the pipe temperature sensor with the correct Carrier part.
- Step 5 – PCB check: Persistent F2 after sensor replacement indicates a likely PCB fault requiring technician replacement.
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Repair Difficulty
Medium
3/5
Required Part
Evaporator Pipe Temperature Sensor (T3 Thermistor)
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