Whirlpool · Refrigerator Moderate
OP — Open Thermistor Circuit
'OP' indicates an open temperature sensor circuit — either a thermistor is fully open (failed) or its harness is unplugged. The control cannot read that compartment's temperature.
- Keep using it?
- Yes, with caution
- DIY difficulty
- Moderate
- Verified against
- ifixit.com ↗
How to fix it
- Power-cycle the refrigerator for 5 minutes.
- Identify the affected compartment from the display (fresh food, freezer, drawer).
- Locate that compartment's thermistor and disconnect it.
- Ohm-test — open reading confirms a failed sensor. About 10kΩ at room temp means the sensor is OK and the issue is wiring.
- Replace the sensor or repair the wire as appropriate.
Why it happens
Typical signs: 'OP' on display · Compartment runs too warm or too cold · Temperature setting unresponsive · Display may also show which compartment is affected
- Disconnected thermistor harness Connector unseated after service or vibration.
- Failed thermistor Sensor element has gone fully open.
- Broken sensor lead Wire severed at the crimp.
More Whirlpool refrigerator codes
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: ifixit.com.