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Error code reference

GE Refrigerator Error Code S

Thermistor shorted to 5 VDC detected during diagnostic test 07.

GE codesGE refrigerator codes

Thermistor shorted to 5 VDC detected during diagnostic test 07.

First step from the service manual

Check thermistor wiring for short to 5V supply; replace thermistor if wiring is OK.

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

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What S means on a GE refrigerator

Error code S on a GE refrigerator indicates the control board has detected a shorted thermistor condition, specifically a sensor reading that is pinned at or near 5 VDC. The control board continuously monitors thermistor resistance to determine compartment temperatures. When the signal voltage locks at 5 VDC instead of varying with temperature, the board interprets this as a short circuit in the thermistor circuit and logs the S fault. This is a signal-level fault, not a power fault, so the specific thermistor involved will depend on which sensor circuit triggered the code.

For homeowners, the thermistor is a small temperature sensor inside your refrigerator that tells the control board how cold the compartment is. When this sensor shorts out or its wiring shorts to the 5-volt reference line, the board loses accurate temperature data and cannot regulate cooling properly. Your refrigerator may run continuously, not cool correctly, or shut down protective functions as a result.

The first diagnostic step is inspecting the thermistor wiring harness for any pinched, chafed, or melted wiring that could create a short to the 5 VDC reference line. If the wiring checks out, the thermistor itself has likely failed internally and needs replacement. This is a relatively accessible repair on most GE refrigerator models.

Source: manufacturer service documentation.

Common causes of S

  1. 01

    Failed thermistor with internal short

    Part replacement

    The thermistor itself has developed an internal short circuit, causing the signal voltage to read a fixed 5 VDC instead of varying with temperature. This is the most common cause of the S code after wiring has been ruled out.

  2. 02

    Shorted thermistor wiring harness

    Wiring / connection

    The wiring harness connecting the thermistor to the control board has a short, often caused by a pinched wire, chafed insulation, or a connector pin bridging the signal wire to the 5 VDC reference wire. This can produce the same S fault without the thermistor itself being defective.

  3. 03

    Damaged or corroded thermistor connector

    Wiring / connection

    Moisture or physical damage at the thermistor connector can cause the signal pin and the 5 VDC reference pin to bridge, creating a false short reading at the control board. Cleaning or replacing the connector may resolve the fault.

  4. 04

    Faulty control board misreading thermistor circuit

    Part replacement

    In rare cases, the control board's thermistor input circuit has failed internally, causing it to report a 5 VDC short even when the thermistor and wiring are intact. This should only be considered after the thermistor and all wiring have been verified as good.

See the test procedure for each cause

Frequently asked questions about S

What does error code S mean on a GE refrigerator?
Error code S on a GE refrigerator means the control board detected a thermistor signal voltage stuck at 5 VDC, which the board interprets as a shorted sensor. The thermistor is a temperature sensor that normally varies its resistance and signal voltage as the compartment temperature changes. A fixed 5 VDC reading tells the board the sensor circuit has a short, preventing accurate temperature monitoring.
How do I fix error code S on a GE refrigerator?
Start by unplugging the refrigerator and locating the thermistor wiring harness. Inspect the wiring for any pinched, chafed, or damaged insulation and check the connector for bridged pins or corrosion. If the wiring looks intact, test the thermistor resistance with a multimeter and compare the reading to the specification in your service manual. A shorted thermistor will typically read very low resistance or near zero; replace the thermistor if it tests shorted. If replacing the thermistor does not clear the code, the control board may need evaluation.
Can I still use my GE refrigerator while error code S is active?
You can continue using the refrigerator in the short term, but cooling performance may be unreliable. The control board uses thermistor data to regulate compressor and fan operation, so a shorted sensor can cause the refrigerator to run continuously, fail to reach target temperatures, or cycle incorrectly. Perishables are at risk if the compartment temperature rises. Address the S code promptly to avoid food spoilage and potential compressor wear from uncontrolled run cycles.
How much does it cost to fix error code S on a GE refrigerator?
A replacement thermistor for a GE refrigerator typically costs between $15 and $40 for the part, and the repair is accessible to most DIY homeowners with basic tools and a multimeter. If a technician is needed for diagnosis and replacement, expect a service call fee plus labor, generally putting the total between $100 and $200 depending on your area. If the fault traces to the control board instead of the thermistor, board replacement costs range from $100 to $300 for the part alone.
How do I test the thermistor to confirm it is causing the S error code on my GE refrigerator?
Unplug the refrigerator and disconnect the thermistor connector. Set a multimeter to measure resistance and probe the two terminals on the thermistor itself. At room temperature, most GE refrigerator thermistors read approximately 5,000 to 11,000 ohms depending on the model; check your specific model's service data for the exact spec. A reading of near zero or a dead short confirms the thermistor has failed and needs replacement. If the thermistor reads correctly in isolation but the code persists, re-examine the wiring harness for a short between the signal wire and the 5 VDC reference wire.

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