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Error code reference

GE Refrigerator Error Code 0720

Upper AutoFill Sensor Error (Clean sensors).

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Upper AutoFill Sensor Error (Clean sensors).

First step from the service manual

Clean sensors.

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

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What 0720 means on a GE refrigerator

Error code 0720 on a GE refrigerator indicates an Upper AutoFill Sensor Error. The AutoFill system uses optical or capacitive sensors to detect water levels in the internal pitcher or reservoir. When the control board cannot read a valid signal from the upper sensor, it triggers this fault code to prevent overfilling or incorrect fill cycles. The upper sensor specifically monitors the high water level threshold, making it a critical component for accurate AutoFill operation.

The most frequent cause of this error is sensor contamination. Mineral deposits from hard water, biofilm buildup, or debris accumulating on the sensor surface can interfere with the sensor's ability to detect water presence. This is why the primary diagnostic step is cleaning the sensors directly. In many cases, a thorough cleaning resolves the fault without any part replacement.

If cleaning does not clear the error, the fault may point to a damaged or failed upper sensor, a wiring harness issue between the sensor and the control board, or a problem with the board itself. Technicians should inspect the sensor connections for corrosion or loose terminals after cleaning. Persistent errors after cleaning indicate further electrical diagnosis is needed to determine whether the sensor or its associated wiring requires replacement.

Source: manufacturer service documentation.

Common causes of 0720

  1. 01

    Mineral or scale buildup on sensor

    Wiring / connection

    Hard water deposits can coat the upper AutoFill sensor and block its ability to detect water levels. Cleaning the sensor surface with a soft cloth and a mild descaling solution is the recommended first step.

  2. 02

    Biofilm or slime on sensor surface

    Wiring / connection

    Organic residue or biofilm can accumulate on the sensor over time, mimicking a fault condition. Regular cleaning of the AutoFill compartment and sensors helps prevent this.

  3. 03

    Failed or damaged upper AutoFill sensor

    Part replacement

    If cleaning does not resolve the error, the sensor itself may be physically damaged or electrically failed. A failed sensor will require replacement to restore AutoFill function.

  4. 04

    Loose or corroded wiring connection

    Wiring / connection

    The wiring harness connecting the upper sensor to the control board may have a loose terminal or corrosion at the connector. Inspecting and reseating the connection can resolve intermittent faults.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the main control board may fail to correctly interpret a valid signal from the upper sensor. This is typically diagnosed only after the sensor and wiring have been confirmed to be in good condition.

See the test procedure for each cause

Frequently asked questions about 0720

What does 0720 mean on a GE refrigerator?
Error code 0720 on a GE refrigerator indicates an Upper AutoFill Sensor Error. This means the control board is not receiving a valid signal from the upper water-level sensor in the AutoFill system. The error is most commonly caused by mineral deposits or buildup on the sensor surface. Cleaning the sensors is the first recommended diagnostic step.
How do I fix error code 0720 on my GE refrigerator?
Start by cleaning the upper AutoFill sensor and the surrounding area in the AutoFill compartment. Mineral deposits, biofilm, and debris are the most common causes and can often be removed with a soft cloth and mild cleaner. If the error persists after cleaning, inspect the sensor wiring connections for looseness or corrosion, and consider replacing the upper sensor if no wiring fault is found.
Will resetting my GE refrigerator clear the 0720 error code?
A reset alone is unlikely to permanently clear the 0720 error if the underlying cause has not been addressed. If the sensor is dirty or faulty, the code will return after the reset. Clean the sensors first, and then perform a reset to see if the fault clears and stays cleared.
Is error code 0720 on a GE refrigerator a safety concern?
The 0720 error is not a safety hazard in the traditional sense, but it does affect the AutoFill system's ability to operate correctly. An unresolved sensor fault could lead to the AutoFill pitcher not filling properly or filling incorrectly. It is best to address the error promptly to avoid disruption to the water dispenser feature.
How much does it cost to repair a GE refrigerator showing error code 0720?
If cleaning the sensors resolves the issue, there is no parts cost involved. If the upper AutoFill sensor itself needs replacement, parts and labor costs typically range from around $75 to $200 depending on your location and service provider. A control board replacement, if required, would cost more, generally in the range of $150 to $400 including parts and labor.

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