Jenn-Air Refrigerator Error Code OP

The OP code means the refrigerator's control board detected an open circuit from a thermistor input during a diagnostic test. A thermistor is a temperature sensor that provides resistance-based readings to help the refrigerator regulate cooling. The code indicates no valid signal is reaching the board from that sensor circuit. The fault can originate from the thermistor itself or from the wiring that connects it to the control board.

It is not advisable to rely on the refrigerator normally while the OP code is active. The faulty thermistor means the control board may not have accurate temperature data for that compartment, which could cause improper cooling or temperature swings. Food safety can be at risk if the refrigerator is not maintaining correct temperatures, so the issue should be diagnosed and repaired promptly.

Repair costs vary depending on the root cause. If only the thermistor needs replacement, parts typically range from around $15 to $60, with a professional labor charge on top of that. If the wire harness requires repair or replacement, costs can be higher, generally ranging from $100 to $300 or more depending on the extent of the damage and local labor rates. Diagnosing the issue first before ordering parts helps avoid unnecessary expense.

Some steps are accessible to knowledgeable DIYers, such as inspecting connector JP2 for loose or corroded terminals and reseating any disconnected plugs. However, accurately diagnosing whether the fault is a failed thermistor or a broken wire harness requires measuring resistance in ohms at specific connector points, which needs a multimeter and some technical familiarity. Replacing the thermistor is a straightforward parts swap if the component is confirmed bad, but tracing and repairing a broken harness can be more involved.

A simple reset by unplugging the refrigerator or cycling the power will not permanently clear the OP code if the underlying fault still exists. The code will return because the control board will continue to detect the open thermistor input once the diagnostic cycle runs again. The error can only be resolved by repairing or replacing the faulty component, whether that is the thermistor or the wire harness.