Frigidaire Refrigerator Error Code t3

The T3 error code on a Frigidaire refrigerator indicates a fault with the TH3 thermistor, which is located on the suction line of the ice maker (I/M) system. A thermistor is a temperature-sensitive resistor that the control board uses to monitor refrigerant suction line temperatures in real time. When the board detects that the TH3 thermistor's resistance reading is outside the expected range, either because the circuit is open (broken or disconnected) or shorted (resistance has dropped to near zero), it triggers the T3 error and flags the component as failed.

The suction line thermistor plays a key role in regulating the ice maker's refrigeration cycle. If the control board cannot get an accurate temperature reading from this sensor, it may be unable to properly manage compressor operation, defrost cycles, or ice production for that circuit. This can result in the ice maker underperforming, freezing up, or stopping production entirely while the error is active.

Common causes of the T3 error include physical damage to the thermistor itself, corrosion or moisture intrusion at the connector, a broken wire in the harness between the thermistor and the control board, or actual thermistor component failure due to age or heat stress. Because the fault is defined as either open or short, testing the thermistor with a multimeter to check resistance is the most direct way to confirm whether the sensor itself has failed or whether the wiring harness is the source of the fault.