Freezer temperature display shows OP or OP FZ; freezer temperature control may not respond correctly.

Safety first: Disconnect power before removing freezer panels or testing components.

Step 1: Locate the freezer thermistor

• Remove freezer baskets and shelves.
• The thermistor is typically clipped to the evaporator cover or side wall behind a small plastic housing.

Step 2: Inspect and test

• Remove the sensor cover and visually inspect the thermistor and wiring.
• Disconnect the thermistor and measure resistance at room temperature or in ice water (about 32°F / 0°C). Compare to the resistance chart in the tech sheet.
• If the meter reads OL (open), the thermistor is defective.

Step 3: Replace the thermistor

• Install a new Frigidaire-compatible freezer thermistor, routing wires as original.
• Secure the sensor in the same location and reinstall the cover and freezer components.

Step 4: Reset

• Restore power and allow the unit to run. The OP FZ code should clear once the control sees a valid sensor reading.

When to call a technician: If the thermistor tests good but the code remains, the wiring in the cabinet or the main control board may be open and require professional service.