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Error code reference

GE Refrigerator Error Code 4

The resistance of all the temperature sensors is outside the normal range (< 660 Ohms).

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The resistance of all the temperature sensors is outside the normal range (< 660 Ohms).

First step from the service manual

Check the 6-way RAST connector at the power/control module.

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

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What 4 means on a GE refrigerator

Error code 4 on a GE refrigerator indicates that the resistance readings from all temperature sensors in the system have dropped below 660 ohms simultaneously. Under normal operating conditions, NTC thermistors used in refrigerator temperature sensing circuits produce resistance values well above this threshold, varying with ambient temperature. When all sensors read below 660 ohms at the same time, the control module interprets this as a global sensor fault rather than a single failed component.

Because this fault affects all sensors simultaneously rather than a single one, the root cause is rarely a coincidental failure of multiple individual thermistors. Instead, the most likely culprit is a wiring or connector issue that creates a short circuit path affecting the entire sensor network. The 6-way RAST connector at the power/control module is the first diagnostic target because it provides the common electrical junction point for all sensor circuits. A loose, corroded, or improperly seated RAST connector can pull all sensor readings low by introducing unwanted resistance paths or partial shorts to ground.

If the RAST connector checks out and the fault persists, the wiring harness between the connector and the individual thermistors should be inspected for pinch points, chafing, or moisture intrusion that could be creating a short. In rare cases, the power/control module itself may have an internal fault causing it to misread all sensor inputs. Technicians should measure individual thermistor resistance values at the connector to determine whether the sensors themselves or the module input circuitry is responsible for the out-of-range readings.

Source: manufacturer service documentation.

Common causes of 4

  1. 01

    Faulty or Unseated 6-Way RAST Connector

    Wiring / connection

    The 6-way RAST connector at the power/control module is the shared connection point for all temperature sensor circuits. If this connector is loose, corroded, or improperly seated, it can pull all sensor resistance readings below the 660-ohm threshold simultaneously.

  2. 02

    Short Circuit in the Sensor Wiring Harness

    Part replacement

    A pinched, chafed, or moisture-damaged section of the wiring harness running to the temperature sensors can create a short that drags all sensor readings out of the normal range. Inspect the harness for visible damage, especially near routing clips and sharp edges.

  3. 03

    Multiple Failed Thermistors

    Part replacement

    Although unlikely to fail at the same time, all thermistors in the system dropping below 660 ohms is possible after a significant electrical event such as a power surge. Each thermistor should be tested individually by measuring its resistance at the RAST connector.

  4. 04

    Moisture Intrusion at the Connector or Harness

    Wiring / connection

    Water or ice buildup around the RAST connector or wiring harness can create conductive paths that lower apparent resistance across all sensor circuits. Check for signs of moisture, frost, or corrosion at the connector terminals.

  5. 05

    Defective Power/Control Module

    Part replacement

    If the connector and wiring harness both test within spec, the power/control module itself may have an internal fault causing it to misinterpret all sensor inputs as being below 660 ohms. This is the least likely cause and should be diagnosed only after all wiring and sensors are confirmed good.

See the test procedure for each cause

Frequently asked questions about 4

What does 4 mean on a GE refrigerator?
Error code 4 means the resistance of all temperature sensors in the refrigerator has dropped below 660 ohms, which is outside the normal operating range. Because all sensors are affected at once, this typically points to a shared wiring or connector problem rather than multiple individual sensor failures. The first place to check is the 6-way RAST connector at the power/control module.
Can I fix error code 4 on my GE refrigerator myself?
A knowledgeable DIYer can start by inspecting and reseating the 6-way RAST connector at the power/control module, which requires basic mechanical skills and no special tools. If the connector looks corroded or damaged, cleaning the terminals or replacing the connector may resolve the fault. However, if the issue lies in the wiring harness or the control module itself, professional diagnosis and repair are recommended.
Will resetting my GE refrigerator clear error code 4?
A reset may temporarily clear the error code from the display, but if the underlying cause is still present, the code will return once the control module re-evaluates the sensor readings. Resetting is useful for confirming whether the fault is intermittent, but it should not be relied on as a fix. The root cause in the sensor circuit or wiring must be corrected to permanently resolve the error.
Is it safe to keep using my GE refrigerator while error code 4 is active?
Error code 4 means the control board cannot reliably read any of the internal temperatures, so it cannot properly regulate cooling. Food safety may be at risk if the refrigerator is not maintaining correct temperatures without the technician being aware. It is best to check the actual temperature inside the unit with a standalone thermometer and avoid storing perishables until the fault is resolved.
How much does it cost to repair error code 4 on a GE refrigerator?
Repair costs depend on the root cause. Reseating or cleaning a connector is typically a low-cost service call, ranging from roughly $75 to $150 for labor alone. Replacing a wiring harness or individual thermistors can add $50 to $200 or more in parts. If the power/control module needs replacement, total costs including parts and labor can range from $200 to $500 or higher depending on the model.

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