Refrigerator displays OP for the fresh food temperature; cooling may be erratic in the refrigerator section.

Safety first: Disconnect power before accessing sensors or control boards.

Step 1: Locate the fresh food thermistor

• The thermistor is usually behind a small plastic cover on the rear or side wall of the refrigerator compartment.
• Remove shelves as needed and gently pry off or unscrew the cover.

Step 2: Inspect wiring and connector

• Check that the thermistor is firmly connected to its harness.
• Look for broken, chewed, or pinched wires along the visible run.

Step 3: Test the thermistor

• Disconnect the thermistor from the harness.
• Using a multimeter set to resistance (ohms), measure the thermistor at room temperature. Typical Frigidaire thermistors read around 8–10 kΩ at 77°F (25°C), but verify with your tech sheet.
• If the meter shows OL (open) or extremely high resistance, the thermistor is defective.

Step 4: Replace the thermistor

• Order a Frigidaire Gallery-compatible fresh food thermistor.
• Install the new sensor in the same location, routing the wires exactly as original to avoid pinching.
• Reconnect to the harness and reinstall the cover and shelves.

Step 5: Reset and test

• Restore power and allow several hours for temperatures to stabilize.
• The OP code should clear automatically once the control detects a valid sensor reading.

When to call a technician: If the new thermistor does not clear the OP code, the wiring in the cabinet or the main control board may be faulty and require professional diagnosis.