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Error code reference

GE Refrigerator Error Code 0003

FZ Evaporator Thermistor reading out of range

GE codesGE refrigerator codes

FZ Evaporator Thermistor reading out of range

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  • 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
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What 0003 means on a GE refrigerator

Error code 0003 on a GE refrigerator indicates the main control board has detected that the freezer thermistor is returning a reading outside its expected resistance range. The freezer thermistor is a temperature-sensing component that continuously reports freezer compartment temperature to the control board. When the board receives a signal that falls outside the valid parameters, either too high, too low, or no signal at all, it logs this code and may alter or disable normal cooling operation to protect the unit.

For a homeowner, think of the freezer thermistor as a small sensor that tells the refrigerator's brain how cold the freezer actually is. If that sensor stops working, sends a garbled signal, or its wiring gets damaged, the refrigerator no longer has accurate temperature data and cannot regulate the freezer properly. This can result in the freezer running too cold, not cold enough, or cycling erratically.

The code triggers under three general conditions: the thermistor resistance is too high (open circuit or broken sensor), too low (short circuit), or the wiring connecting it to the control board is damaged or disconnected. In some cases, ice buildup around the sensor can affect its readings as well.

Source: manufacturer service documentation.

Common causes of 0003

  1. 01

    Failed freezer thermistor

    Part replacement

    The thermistor itself has failed internally, causing it to read an open or short circuit. This is the most common cause of code 0003 and will produce a resistance reading the control board cannot interpret.

  2. 02

    Damaged or disconnected wiring harness to freezer thermistor

    Wiring / connection

    The wire harness connecting the freezer thermistor to the control board can crack, corrode, or become unplugged, sending no signal or an erratic signal to the board. Inspecting the connector and wire routing from the thermistor to the board can confirm this.

  3. 03

    Ice buildup encasing the thermistor

    Wiring / connection

    Heavy frost accumulation around the thermistor probe can thermally insulate it or physically damage the sensor body, pushing its readings out of range. Running a manual defrost cycle before condemning the thermistor is a worthwhile diagnostic step.

  4. 04

    Faulty main control board

    Part replacement

    If the thermistor and its wiring both test within spec using a multimeter but the code persists, the control board's thermistor input circuit may have failed. This is the least likely cause and should only be considered after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about 0003

What does error code 0003 mean on a GE refrigerator?
Code 0003 means the control board detected that the freezer thermistor is sending a reading outside its acceptable resistance range. The thermistor is the temperature sensor for the freezer compartment. The cause is typically a failed thermistor, a wiring problem, or in some cases heavy frost buildup around the sensor.
How do I fix error code 0003 on a GE refrigerator?
Start by unplugging the refrigerator and locating the freezer thermistor, which is usually clipped to the evaporator cover or a fin inside the freezer. Check the connector at the thermistor for damage or corrosion, then use a multimeter to test the thermistor's resistance and compare it to the spec in your model's service manual. A thermistor at room temperature typically reads around 5,000-16,000 ohms depending on the model. If the reading is open, shorted, or far outside spec, replace the thermistor. If the wiring and thermistor both test good, the control board may need replacement.
Is it safe to keep using my GE refrigerator with error code 0003 active?
Short-term use is possible, but the refrigerator cannot accurately regulate freezer temperature without a functioning thermistor. This means the freezer could run too warm, risking food safety, or too cold, causing excess frost. Do not store items that require strict temperature control, such as breast milk, medications, or raw meat, until the code is resolved. Address the issue within a day or two to avoid food loss.
How much does it cost to fix error code 0003 on a GE refrigerator?
A replacement freezer thermistor for a GE refrigerator typically costs between $10 and $30 for the part and is a relatively simple DIY repair requiring only a screwdriver and a multimeter. If a technician is needed, expect $100 to $200 total including labor. If the control board turns out to be the failed component, parts alone can range from $80 to $250 depending on the model, and professional installation will add to that cost.
How do I test the freezer thermistor to diagnose code 0003?
Unplug the refrigerator, then locate and disconnect the freezer thermistor connector. Set a multimeter to measure resistance (ohms) and probe the two thermistor terminals. Compare the reading to your model's service data, which is often found on a wiring diagram inside the refrigerator or in the service manual. A reading of infinite resistance means the thermistor is open and must be replaced. A reading of zero or near-zero ohms means it is shorted. A reading within spec points the diagnosis toward the wiring harness or control board.

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