mypros+
Error code reference

GE Refrigerator Error Code OP

Fresh food temperature sensor is open circuit (displayed in fresh food position with normal freezer display).

GE codesGE refrigerator codes

Fresh food temperature sensor is open circuit (displayed in fresh food position with normal freezer display).

First step from the service manual

Check fresh food thermistor connections and resistance per NTC chart.

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 GE refrigerator

The OP error code on a GE refrigerator indicates an open circuit condition in the fresh food compartment temperature sensor, also known as the fresh food thermistor. This code appears in the fresh food temperature display position while the freezer display continues to show normal readings, which helps isolate the fault to the fresh food side of the system. An open circuit means the control board is receiving no signal from the thermistor, typically because the electrical path between the sensor and the board has been broken entirely.

The fresh food thermistor is a Negative Temperature Coefficient (NTC) type sensor, meaning its resistance decreases as temperature rises. The control board monitors this resistance continuously to regulate fresh food compartment cooling. When the circuit reads as open (infinite or unmeasurably high resistance), the board cannot calculate compartment temperature and flags the fault with the OP code. This is distinct from a short circuit fault, which would present differently on the display.

The most direct diagnostic approach is to inspect the thermistor's wiring harness and connector for damage, corrosion, or a loose connection, then measure the thermistor's resistance and compare it against the NTC resistance chart for the specific model. A properly functioning NTC thermistor will show a predictable resistance value at a given temperature. A reading of infinite resistance confirms the thermistor itself is open and needs replacement, while a normal resistance reading with the code still present points to a wiring or connector issue between the sensor and the control board.

Source: manufacturer service documentation.

Common causes of OP

  1. 01

    Loose or disconnected thermistor connector

    Wiring / connection

    The wiring connector at the thermistor or at the control board may have vibrated loose or pulled free. Inspect both ends of the harness for proper seating and any signs of the connector backing out.

  2. 02

    Failed fresh food thermistor (open internally)

    Part replacement

    The thermistor element itself can fail internally, breaking the circuit. Measuring resistance across the thermistor leads and comparing to the NTC chart will confirm this. An infinite resistance reading at a known temperature indicates a failed sensor.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire running from the thermistor to the control board can become pinched, cracked, or broken, especially near door hinges or mounting clips. Visually trace the harness and check for continuity with a multimeter.

  4. 04

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture inside the fresh food compartment can cause terminal corrosion at the sensor connector, increasing resistance to the point of an open circuit reading. Look for green or white oxidation on the connector pins.

  5. 05

    Faulty main control board

    Part replacement

    If the thermistor resistance measures correctly per the NTC chart and the wiring harness shows continuity throughout, the control board's sensor input circuit may have failed. This is the least likely cause and should be diagnosed only after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about OP

What does OP mean on a GE refrigerator?
OP indicates that the fresh food compartment temperature sensor (thermistor) is showing an open circuit to the control board. It appears on the fresh food side of the display while the freezer display continues to read normally. The control board cannot receive a temperature signal from that sensor, so it flags the fault. This typically points to a disconnected connector, broken wire, or a thermistor that has failed internally.
Can I fix the OP error code on my GE refrigerator myself?
Yes, in many cases. Start by unplugging the refrigerator and locating the fresh food thermistor, then check that its wiring connector is firmly seated. If the connection looks secure, use a multimeter to measure the thermistor's resistance and compare it to the NTC temperature-resistance chart for your model. If the thermistor reads infinite resistance, it needs replacement, which is a straightforward part swap for someone comfortable with basic appliance repair.
Will resetting my GE refrigerator clear the OP error code?
A power reset may temporarily clear the display, but the code will return if the underlying open circuit condition still exists. The control board continuously monitors the thermistor signal, so any reset is only temporary unless the actual fault, whether a bad connection, broken wire, or failed thermistor, is corrected first.
Is it safe to keep using my refrigerator when the OP code is displayed?
You should address the code promptly rather than ignoring it. Without a functioning fresh food thermistor, the control board cannot accurately regulate the temperature in the main compartment, which can lead to food spoilage from inconsistent or improper cooling. The freezer may continue operating normally, but the fresh food section is at risk of temperature swings.
How much does it cost to fix the OP error code on a GE refrigerator?
If the fix is simply reseating a loose connector, there is no parts cost involved. Replacing a failed fresh food thermistor typically costs between $15 and $50 for the part, depending on the model. If a professional technician is needed for diagnosis and repair, total costs including labor generally range from $100 to $250, with a faulty control board at the higher end of repair expenses.

Related GE refrigerator codes

All GE refrigerator codes
View all 540 GE refrigerator codes

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

Get Started

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