Polar Refrigerator Error Code Thermistor Fault

This fault means the refrigerator's control system has detected that the thermistor, the internal temperature sensor, is inoperable. The unit responds by switching to a backup operating mode to continue cooling while the fault is present. On N7V and N8V models, the indicator light flashes off every 20 seconds in green (AC mode) or amber (gas mode). On N7X and N8X models, the temperature snowflake icons on the display will flash.

The refrigerator does continue to operate in a backup mode during this fault, so it is still cooling. However, precise temperature regulation is compromised, which means the cabinet temperature may not be held as accurately as normal. Food safety could be at risk if the backup mode does not maintain adequate temperatures over time, so the fault should be resolved as soon as possible.

If the fix is simply reseating a connector or cleaning corroded terminals, there may be no parts cost involved, with only a service call fee if a technician is used. Replacing a thermistor is generally an inexpensive repair, with parts typically ranging from $10 to $50 depending on the model. If a damaged wire harness or control board is involved, repair costs will be higher, potentially ranging from $80 to $300 or more including labor.

Start by checking that the thermistor wire is fully plugged in at both the sensor and control board ends. Inspect the entire wire harness and connector for broken wires, bent pins, or dirty contacts and clean or reseat as needed. If the connections are all secure and intact, test the thermistor itself for the correct resistance and replace it if it has failed.

A power reset may temporarily clear the fault display, but if the underlying cause, such as a loose connector, damaged wire, or failed thermistor, is still present, the fault will return. The fault code will only clear permanently once the faulty component or connection has been found and corrected.