Frigidaire Air Conditioner Error Code F2

The F2 error code on a Frigidaire air conditioner indicates a fault in the indoor evaporator temperature sensor circuit. This sensor, also called the evaporator coil thermistor, monitors the temperature of the indoor evaporator coil and sends that data to the control board. The control board uses this information to regulate cooling cycles, prevent coil icing, and protect the compressor from operating under abnormal conditions. When the controller detects that the sensor signal is either open-circuit (no signal, indicating a broken wire or failed sensor) or short-circuit (signal is shorted, producing out-of-range readings), it triggers the F2 code and typically disables normal operation.

The most common trigger for F2 is a loose or poorly seated wiring terminal between the sensor and the controller board. Vibration during operation can cause connectors to back out over time, interrupting the signal. Beyond connection issues, the thermistor itself can fail internally, producing either infinite resistance (open) or near-zero resistance (short), both of which fall outside the acceptable operating range the controller expects. Physical damage to the sensor wire, such as pinching, chafing against sheet metal, or rodent damage, can also create an open or short condition in the harness.

Diagnosing F2 starts with a careful visual inspection of the wiring harness running from the evaporator sensor to the control board, paying close attention to the connector terminals for corrosion, bent pins, or loose fit. If the connections appear sound, the thermistor itself should be tested with a multimeter to verify its resistance falls within the expected range at a known ambient temperature. A failed sensor will need to be replaced to clear the fault and restore normal operation.