Norcold Refrigerator Error Code Flashing Temp Setting

A flashing temperature setting display on a Norcold refrigerator indicates that the control board has detected a thermistor failure and has shifted the unit into Backup Operating System (BOS) mode. The thermistor is the sensor responsible for reporting compartment temperature to the control system. Without a valid thermistor signal, the refrigerator continues to run but loses precise temperature regulation. The fault most commonly originates at the P1 connector terminals 8 and 13 rather than the thermistor component itself.

A reset may temporarily clear the display, but the fault will return if the underlying thermistor circuit problem is not corrected. Because the code indicates an actual sensor or wiring failure, the root cause at the P1 connector or thermistor must be diagnosed and repaired to achieve a lasting fix. Resetting without addressing the fault leaves the refrigerator operating in BOS mode without accurate temperature control.

If the fix is simply cleaning or reseating the P1 connector, the repair may cost little to nothing beyond your time. Replacing the thermistor wire assembly is generally an inexpensive repair, with parts typically ranging from around 15 to 60 dollars depending on the specific assembly. If the control board is determined to be the cause, board replacement is significantly more expensive, often ranging from 150 to 400 dollars or more for parts alone.

Start by inspecting the thermistor wire assembly and the P1 connector at terminals 8 and 13 for dirty, corroded, or broken connections. Clean and reseat the connector to see if the fault clears. If the connection looks good, test the thermistor wire assembly for continuity and then test the thermistor resistance to determine whether the sensor itself needs replacement.

The refrigerator will continue to operate in Backup Operating System (BOS) mode with the fault active, but it cannot accurately regulate compartment temperature without a functioning thermistor. Food safety may be compromised if the unit runs too warm or too cold without proper feedback control. It is advisable to diagnose and repair the fault promptly rather than relying on BOS mode for extended operation.