Whirlpool Freezer Error Code OP

The OP code means the freezer's control board has detected an open circuit on the thermistor, with resistance measuring above 88k ohms. The thermistor is the temperature sensor the freezer uses to monitor and regulate its internal temperature. When the circuit is open, the board cannot get a valid reading and triggers the OP alert. This can be caused by a failed sensor, a broken wire, or a loose connector.

It is not recommended to continue using the freezer normally with an active OP error. Because the control board cannot read the cabinet temperature accurately, the freezer may not maintain safe storage temperatures for food. The compressor could run erratically or not at all, putting frozen food at risk. Address the error as soon as possible to avoid food spoilage.

Unplugging the freezer or cycling power may temporarily clear the OP code display, but the error will return if the underlying fault is still present. The thermistor circuit must be repaired or the failed component replaced before the code will clear permanently. Resetting without fixing the root cause does not restore accurate temperature monitoring and is not a solution.

Some causes of the OP code are DIY-friendly, particularly reconnecting a loose or unplugged wiring connector. Start by disconnecting power to the freezer, then inspect the thermistor wiring and connectors for any obvious damage or disconnection. Testing the thermistor resistance with a multimeter and comparing it to the diagram values will confirm whether the sensor needs replacing. If the wiring and sensor both test good, diagnosing the control board typically requires professional service.

Repair costs depend on which component has failed. A replacement thermistor is typically the least expensive fix, with parts generally ranging from $15 to $50 and professional labor adding $75 to $150 or more. If the control board is at fault, parts alone can range from $100 to $250 or higher, plus labor. Getting a diagnostic visit from a technician will give you a more accurate estimate for your specific model.