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
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
Frequently asked questions
What does the OP code mean on a Whirlpool refrigerator?
'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.
What causes the OP code on a Whirlpool refrigerator?
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.
Is it safe to keep using a Whirlpool refrigerator with a OP error?
Yes, with caution. This is rated a moderate-severity fault.
How do I fix OP on a Whirlpool refrigerator?
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.
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.