Frigidaire Refrigerator Error Code OP (FZ)

OP (FZ) means the refrigerator's control board has detected an open circuit in the freezer thermistor, which is the temperature sensor inside the freezer compartment. The board is not receiving a valid resistance signal from the sensor. This can be caused by a broken thermistor, damaged wiring, or a connector issue. The freezer may not maintain proper temperature while this fault is active.

Operating the refrigerator with an active OP (FZ) code is not recommended for extended periods, as the control board may not be able to regulate freezer temperature accurately without a working sensor. Food safety could be at risk if the freezer temperature rises above safe levels. It is best to address the fault promptly and monitor freezer temperature closely in the meantime.

If the fix is a simple wiring or connector repair, costs could be minimal, primarily covering your time or a basic service call fee ranging from around $75 to $150. If the freezer thermistor needs to be replaced, the part itself typically costs between $15 and $50 depending on the model, with total repair costs including labor ranging from $100 to $200. A control board replacement, if needed, is the most expensive outcome, with parts and labor potentially ranging from $200 to $400 or more.

In many cases, yes. Start by inspecting the wiring harness and connectors leading to the freezer thermistor for pin back-outs, pinched wires, or visible damage, as these issues can often be corrected without replacing any parts. If the wiring is intact, you can test the thermistor with a multimeter to determine whether it has failed. Thermistor replacement is generally a straightforward repair for someone comfortable working with appliance wiring.

A reset may temporarily clear the error code from the display, but the code will return if the underlying fault in the thermistor circuit has not been repaired. Simply resetting the unit without diagnosing and fixing the open circuit will not resolve the problem. A proper repair of the wiring or thermistor is required to permanently clear the fault.