Norcold Refrigerator Error Code Flashing Temperature Setting

A flashing temperature setting on a Norcold refrigerator means the control board has detected that the thermistor, the cabinet temperature sensor, is not functioning or providing a valid signal. As a result, the unit has automatically switched to BOS mode, which is a backup operating system that keeps the refrigerator running without thermistor input. The fridge will continue to cool, but with less precise temperature regulation than normal. The fault needs to be diagnosed and repaired to restore full temperature control.

The refrigerator will continue to run in BOS mode, so it is not immediately non-functional. However, because BOS mode uses a fixed cycle rather than dynamic temperature sensing, cabinet temperatures may not be held as consistently as normal. For short-term use this is generally acceptable, but the fault should be repaired promptly to ensure food is kept at safe temperatures reliably.

If the issue is simply a loose or dirty connector, the repair can cost little to nothing beyond a can of electrical contact cleaner. Replacing a thermistor wiring harness or the thermistor sensor itself typically runs in the range of $20 to $80 in parts, depending on the specific model. If the control board is at fault, parts and labor costs can range from $150 to $400 or more. Starting with the simple wiring checks first can save significant repair costs.

Start by checking whether the thermistor wire is fully plugged in at both ends. If it is connected, inspect the wire harness for any broken, pinched, or chafed sections, and examine the connector pins for corrosion or dirt that could be blocking the signal. Cleaning dirty pins with electrical contact cleaner or reseating a loose connector often resolves the fault. If wiring checks out, the thermistor sensor itself may need to be tested and replaced.

A reset alone will not permanently clear this error if the underlying thermistor fault still exists. The control board will detect the inoperable sensor again after the reset and return to BOS mode with the flashing display. The fault will only clear when the thermistor connection is restored or the faulty component is replaced.