Frigidaire Refrigerator OP Error Code — What It Means
OP shows on the temperature display when a temperature sensor reads open, meaning the circuit is broken. It can appear on the freezer display for the freezer sensor or the fresh food display for the refrigerator sensor.
It sometimes shows briefly when a door is open. If OP stays after the doors are shut, the thermistor or its wiring has an open connection.
Common Causes
- Open thermistor The temperature sensor has failed and reads infinite resistance.
- Disconnected sensor plug A loose or unplugged sensor connector breaks the circuit and shows OP.
- Broken sensor wire A cut or corroded wire between the sensor and board opens the path.
- Door switch confusion A door left ajar or a stuck door switch can briefly display OP.
- Faulty control board input If the sensor reads correct, the board sensor input may have failed.
Step-by-Step Fix
- Confirm both doors are fully closed and the code is not just a door alert.
- Unplug the refrigerator before working on the wiring.
- Find the sensor for the display showing OP and unplug its connector.
- Inspect the wires and plug for breaks, corrosion, or a loose fit.
- Measure the thermistor resistance, which should read near 32,500 ohms at 32 degrees.
- Replace the thermistor if the meter reads infinite or open.
- Reseat the connector, restore power, and confirm the code clears.
Parts Often Needed
| Part | Notes |
|---|---|
| Frigidaire freezer temperature sensor | Amazon | Thermistor for the freezer. Match the part number to your model. |
| Frigidaire refrigerator temperature sensor | Amazon | Thermistor for the fresh food section. Order by model number. |
| Sensor wire harness | Amazon | Replace if a wire is broken or corroded at the connector. |
When to Call a Pro
If the thermistor reads correct resistance and the wiring is intact but OP returns, the control board input may be open. That board level diagnosis is a good time to bring in a technician.