Frigidaire Refrigerator Error Code 3

Error code 3 means the refrigerator's control board has detected a shorted thermistor during its startup self-test or service diagnostics. The thermistor is a temperature sensor used to monitor the freezer or fresh food compartment. A shorted thermistor sends an invalid resistance reading to the board, disrupting accurate temperature control. The fault must be diagnosed at the wiring and sensor level before the refrigerator can operate normally.

Operating the refrigerator with an active error code 3 carries some risk because the control board cannot reliably regulate compartment temperatures without accurate sensor input. Food may not be kept at safe temperatures, and you may not be able to detect if the freezer or fresh food compartment is too warm. It is best to address the fault promptly and monitor food temperatures closely if the unit must remain in service during diagnosis.

A power reset may temporarily clear the error code from the display, but the fault will return during the next startup self-test or diagnostic cycle if the shorted thermistor or wiring issue has not been corrected. Resetting the unit does not repair the underlying hardware problem. The code will continue to appear until the shorted sensor or its wiring is replaced or repaired.

A knowledgeable DIYer can diagnose this fault by inspecting the thermistor wiring harness for pinching or damage and testing the thermistor's resistance with a multimeter. If the thermistor reads near zero ohms, it needs to be replaced, which is a straightforward repair involving unplugging the sensor and installing a new one. If wiring or the connector is the issue, repairing or replacing the affected section may also resolve the code without replacing the thermistor.

If only the thermistor needs to be replaced, parts typically cost in the range of $15 to $60 depending on the specific model, making it one of the more affordable refrigerator repairs. Professional labor to diagnose and replace the sensor can add $75 to $200 or more depending on your location and service provider. If the wiring harness or control board is involved, costs will be higher.