OP Moderate Moderate DIY

Whirlpool Refrigerator OP — Open Thermistor Circuit

Whirlpool Refrigerator · Error code OP

What OP Means

'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.

Symptoms

  • 'OP' on display
  • Compartment runs too warm or too cold
  • Temperature setting unresponsive
  • Display may also show which compartment is affected

Common Causes

1
Disconnected thermistor harness

Connector unseated after service or vibration.

2
Failed thermistor

Sensor element has gone fully open.

3
Broken sensor lead

Wire severed at the crimp.

How to Fix It

  1. Power-cycle the refrigerator for 5 minutes.
  2. Identify the affected compartment from the display (fresh food, freezer, drawer).
  3. Locate that compartment's thermistor and disconnect it.
  4. Ohm-test — open reading confirms a failed sensor. About 10kΩ at room temp means the sensor is OK and the issue is wiring.
  5. Replace the sensor or repair the wire as appropriate.

More Whirlpool Refrigerator Codes

6 (flashing) Flashing 6 — 6th Sense Active CE CE — Communication error between control boards CF CF — Communication Failure Co Co — Cooling Off / Demo Mode dF dF — Defrost System Failure Er Er — Generic Error / Control Glitch

All Whirlpool codes → All refrigerator codes →

Verified against manufacturer documentation: ifixit.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.