Frigidaire Refrigerator Error Code t1

The T1 error code on a Frigidaire refrigerator indicates that the freezer temperature sensor (also called the freezer thermistor) has either opened or shorted. A thermistor is a resistive temperature sensor whose resistance value changes predictably with temperature. When the refrigerator's control board reads a resistance value that falls outside the expected range, either too high (open circuit) or too low (short circuit), it triggers the T1 fault code and flags the sensor as defective or disconnected.

The freezer thermistor is a critical component in the sealed refrigeration system's temperature management. The main control board continuously monitors the sensor's resistance to determine the actual freezer compartment temperature and adjusts compressor and fan operation accordingly. An open condition typically means the sensor's internal element has failed or the wiring harness has a break, while a short condition usually points to a failed sensor that is reading near-zero resistance or a harness where wires have contacted each other or a grounded surface.

Common causes include a thermistor that has failed due to age or moisture exposure, a wiring harness connector that has corroded or pulled loose from the sensor or control board, or physical damage to the sensor wire routing through the freezer compartment. In some cases, ice buildup around the sensor mounting location can stress the wiring and cause an intermittent or permanent open fault. Because the control board loses accurate temperature feedback when this code is active, cooling performance and compressor cycling may be erratic until the fault is resolved.