KitchenAid Refrigerator Error Code OP

The OP code means the control board is detecting an open circuit condition on a thermistor or temperature sensor circuit. The sensor reading has dropped below the COLD limit threshold, which the board treats as a broken or disconnected sensor. This prevents accurate temperature monitoring and can interfere with normal cooling operation.

With an OP fault active, the control board cannot reliably read the temperature in the affected zone, which means cooling may not function correctly or consistently. Food safety could be at risk if the refrigerator is not maintaining proper temperatures. It is best to address the fault promptly and use a separate thermometer to verify compartment temperatures in the meantime.

A reset may temporarily clear the OP code from the display, but the fault will return if the underlying open circuit condition has not been corrected. Resetting without repairing the root cause does not restore reliable temperature sensing. The proper fix requires inspecting the thermistor wiring and connections, and replacing the sensor if it is defective.

Many cases of the OP error are resolved by checking and reseating the wiring connectors to the affected thermistor, which requires no special tools. If the thermistor itself has failed, replacing it is a straightforward repair that many experienced DIYers can complete. If wiring and the thermistor both test good, diagnosing a possible control board issue is more complex and may benefit from professional assistance.

If the fix is simply reseating a connector, there may be no parts cost at all. A replacement thermistor typically costs in the range of $15 to $60 depending on the specific sensor and location. If a technician is needed for diagnosis or a control board replacement is required, total repair costs can range from $150 to $400 or more.