Electrolux Refrigerator Error Code OP (FZ)

The OP (FZ) code means the refrigerator's control board has detected an open circuit in the freezer cavity thermistor circuit. The thermistor is a temperature sensor inside the freezer, and an open circuit means the board is receiving no valid signal from it. This can be caused by a loose connector, broken wire, or a failed sensor. The refrigerator cannot properly regulate freezer temperature while this fault is active.

It is not advisable to rely on the refrigerator for long-term food storage while this error is active. Without a functioning freezer thermistor, the control board cannot accurately monitor or regulate freezer temperature, which means food safety cannot be guaranteed. Address the fault as soon as possible to avoid food spoilage or potential compressor issues from uncontrolled operation.

If only the thermistor needs replacement, parts typically cost between $15 and $50, and the total repair cost including labor is generally in the $75 to $200 range. If the wiring harness requires repair or replacement, costs may be somewhat higher depending on the extent of the damage. A control board replacement, if required, is the most expensive outcome and can range from $150 to $400 or more for parts and labor combined.

Many cases of this error are caused by a loose or disconnected wiring connector, which can be resolved without specialized tools by locating and reseating the thermistor connector. If the wiring is intact, testing the thermistor with a multimeter for proper resistance is a straightforward diagnostic step a knowledgeable DIYer can perform. Replacing a thermistor is generally a low-difficulty repair. However, if the main control board is at fault, professional diagnosis is recommended.

A power reset may temporarily clear the error code display, but the fault will return if the underlying cause has not been repaired. The control board will re-detect the open circuit as soon as it resumes monitoring the thermistor. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and correcting the wiring or sensor problem.