mypros+
Error code reference

Frigidaire Refrigerator Error Code OP

Flashing display indicating a potential operating problem detected by the electronic control system.

Frigidaire codesFrigidaire refrigerator codes

Flashing display indicating a potential operating problem detected by the electronic control system.

First step from the service manual

Contact authorized service representative to interpret the flashing message.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for OP.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What OP means on a Frigidaire refrigerator

The OP error code indicates the control board has detected an open circuit in the freezer thermistor. A thermistor is a temperature-sensing resistor that feeds real-time temperature data to the control board. When the board reads an open circuit from this sensor, it means the signal is completely absent rather than returning a resistance value within the expected range. The code appears on the freezer display while the fresh food display goes blank, which is itself a diagnostic indicator pointing specifically to the freezer sensor circuit. This condition can result from a broken wire, a failed thermistor, or a disconnected harness connector between the thermistor and the control board.

For homeowners, this means the refrigerator's brain has lost contact with the temperature sensor inside the freezer compartment. Without reliable temperature data, the control board cannot regulate cooling cycles accurately. Your freezer may run too long, not run enough, or behave erratically. Food safety becomes a concern if the freezer temperature drifts out of the safe range, so monitoring actual freezer temperature with a standalone thermometer is advisable until the issue is resolved.

Source: manufacturer service documentation.

Common causes of OP

  1. 01

    Failed freezer thermistor

    Part replacement

    The thermistor itself has failed internally, breaking the circuit and sending no signal to the control board. This is the most common cause of an open circuit reading and requires replacing the freezer temperature sensor.

  2. 02

    Disconnected or damaged wiring harness

    Wiring / connection

    The connector linking the freezer thermistor to the wiring harness has come loose, corroded, or broken, interrupting the circuit. Inspecting and reseating or repairing the connector can resolve this without replacing the thermistor itself.

  3. 03

    Broken wire in the thermistor circuit

    Part replacement

    A wire in the harness between the thermistor and the control board has developed a break, often due to repeated door flexing or a pinched section. The break creates the open circuit the board is detecting.

  4. 04

    Faulty main control board

    Part replacement

    If the thermistor and all wiring test good with a multimeter, the control board's input circuit for the freezer thermistor may have failed. This is the least likely cause and should only be considered after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about OP

What does the OP error code mean on a Frigidaire refrigerator?
The OP code means the control board is detecting an open circuit on the freezer thermistor. The thermistor is the temperature sensor inside the freezer compartment, and an open circuit means the board is receiving no signal from it at all. This typically points to a failed thermistor, a loose wiring connector, or a broken wire in the sensor circuit.
How do I fix the OP error code on my Frigidaire refrigerator?
Start by locating the freezer thermistor, which is usually clipped to the evaporator cover or sidewall inside the freezer. Check that its wiring connector is fully seated and undamaged. Use a multimeter to test the thermistor's resistance at room temperature, comparing the reading to the manufacturer's spec. If the thermistor reads open or infinite resistance, replace it. If the thermistor and wiring check out, the control board may need replacement.
Is it safe to keep using my Frigidaire refrigerator while the OP code is displayed?
Short-term use is possible, but the risk increases the longer the problem goes unresolved. Without a functioning freezer thermistor, the control board cannot accurately regulate freezer temperature, which may cause food to partially thaw or the compressor to run continuously. Place a standalone thermometer in the freezer to monitor actual temperature and avoid storing temperature-sensitive items until the sensor is repaired.
How much does it cost to fix a Frigidaire refrigerator OP error code?
A replacement freezer thermistor is typically an inexpensive part, often in the $10 to $30 range for most Frigidaire models. If the fix is only a loose connector, there is no parts cost at all. Labor from a technician usually adds $75 to $150 depending on your area. If the control board turns out to be the cause, board replacement can cost $100 to $300 or more for the part alone, making professional diagnosis worthwhile before purchasing a board.
Why is the FF display blank when the OP code shows on the freezer display?
Frigidaire uses the blank fresh food display as part of the diagnostic presentation for the OP code. When the freezer thermistor circuit is open, the control board displays OP on the freezer side and leaves the fresh food display blank to signal that the fault is specific to the freezer sensor. This display behavior is normal for this code and is not a sign of a separate fresh food section problem.

Related Frigidaire refrigerator codes

All Frigidaire refrigerator codes
View all 100 Frigidaire refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass