Frigidaire Air Conditioner Error Code F1

The F1 code means the indoor ambient temperature sensor circuit has been detected as open or short-circuited. This sensor is a thermistor that tells the control board the current room temperature. The fault prevents the unit from receiving a valid temperature reading, which can disrupt normal cooling operation. The issue may be in the sensor itself, its wiring, or the connector terminal.

A power reset may temporarily clear the F1 code, but the error will return if the underlying fault is not corrected. If the sensor circuit is still open or shorted after the reset, the control board will detect the problem again and redisplay the code. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for diagnosing and repairing the root cause.

If the fix is simply reseating a loose connector, there is no parts cost involved. Replacing a failed ambient temperature sensor thermistor is generally an inexpensive repair, with parts typically ranging from a few dollars to around twenty dollars depending on the model. If the control board itself needs replacement, costs increase significantly, often ranging from fifty to over one hundred fifty dollars for the part alone, plus any labor if a technician is involved.

In many cases, yes. Start by unplugging the unit and checking that the wiring connector between the temperature sensor and the control board is fully seated and free of corrosion. If reconnecting the terminal clears the fault, no further repair may be needed. If the sensor itself has failed, replacing a thermistor is a straightforward repair for someone comfortable working with small electrical components.

Running the unit with an active F1 fault is not recommended. Without a valid ambient temperature reading, the control board cannot regulate the cooling cycle properly, which may result in the unit not cooling, short-cycling, or potentially running without the normal temperature-based shutoff controls. It is best to address the fault before resuming regular use.