Norcold Refrigerator Error Code 13

Error code 13 means the refrigerator's thermistor has failed or lost its connection to the control board. The thermistor is the temperature sensor that guides the cooling system. When this fault is detected, the unit automatically switches to its Backup Operating System (BOS) so it can continue running, but without accurate temperature regulation.

The refrigerator will continue to operate under the Backup Operating System when code 13 is active, so it is not an immediate safety hazard. However, because the BOS runs the unit without live temperature feedback, cooling performance will be less accurate and food temperatures may drift outside the ideal range. It is best to address the fault promptly to ensure reliable food preservation.

A reset may temporarily clear the code from the display, but if the underlying thermistor fault still exists, the code 13 will return and the unit will go back into BOS mode. A reset is not a fix for a failed or disconnected thermistor. The root cause, whether it is a loose connector, damaged wiring, or a failed thermistor element, must be corrected before the error will stay cleared.

The first steps are within reach of many DIYers: check that the thermistor connector is fully plugged in and free of corrosion, and inspect the wiring harness for visible damage. If the connector is secure and undamaged but the code persists, testing the thermistor's resistance with a multimeter can confirm whether it needs replacement. Replacing the thermistor is a straightforward repair, but diagnosing a faulty control board typically requires more advanced technical skill.

If only the thermistor sensor needs replacement, parts typically cost in the range of $15 to $50 depending on the specific model, making it one of the more affordable repairs. If professional labor is involved, total repair costs could range from $75 to $200 or more. A control board replacement, if required, is significantly more expensive and can range from $150 to $400 or higher for parts alone.