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Error code reference

GE Dishwasher Error Code F8

Turbidity sensor reading high.

GE codesGE dishwasher codes

Turbidity sensor reading high.

First step from the service manual

Check turbidity sensor harness, replace sensor.

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

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What F8 means on a GE dishwasher

The F8 error code on a GE dishwasher indicates that the turbidity sensor is reporting an abnormally high reading. The turbidity sensor is an optical or electro-optical component that monitors the clarity of the wash water during a cycle. It sends continuous feedback to the control board, allowing the dishwasher to adjust wash time, water usage, and cycle stages based on how dirty the water is. When the sensor reports a reading that exceeds the acceptable threshold, the control board logs F8 and may interrupt or alter the wash cycle.

The most likely causes fall into two categories: a wiring or connection issue in the sensor harness, or an outright failure of the sensor itself. A damaged, corroded, or loose harness connector can cause erratic or falsely elevated signals to reach the control board. In some cases, heavy grease buildup or debris directly on the sensor lens can also cause the optical element to misread water clarity. These physical contamination scenarios can produce the same high-reading fault without any true component failure.

Diagnosis should begin with a thorough inspection of the turbidity sensor wiring harness, checking for loose pins, corrosion at the connector terminals, or visible damage to the wire insulation. If the harness checks out, the sensor itself should be replaced. The sensor is typically mounted in the sump area at the base of the wash tub, making it accessible after removing the lower spray arm and filter assembly.

Source: manufacturer service documentation.

Common causes of F8

  1. 01

    Faulty turbidity sensor

    Part replacement

    The turbidity sensor itself may have failed internally and is sending a consistently high signal to the control board. If the harness and connections check out, sensor replacement is the next step.

  2. 02

    Damaged or loose sensor harness

    Wiring / connection

    A loose connector, corroded terminal, or damaged wire in the turbidity sensor harness can cause erratic or false high readings. Inspect all connector pins and wire insulation closely.

  3. 03

    Debris or grease buildup on the sensor lens

    Wiring / connection

    Heavy grease, food particles, or mineral deposits on the optical surface of the turbidity sensor can block its ability to read water clarity accurately, producing a falsely high reading. Cleaning the sensor lens may resolve the fault.

  4. 04

    Sump area contamination

    Wiring / connection

    Accumulated debris in the sump where the turbidity sensor is mounted can interfere with water flow around the sensor and affect its readings. Cleaning the sump and filter assembly is part of a thorough inspection.

See the test procedure for each cause

Frequently asked questions about F8

What does F8 mean on a GE dishwasher?
F8 on a GE dishwasher means the turbidity sensor is reporting a high reading, indicating it is detecting an abnormal level of cloudiness in the wash water. This could be caused by a failed sensor, a wiring harness issue, or physical contamination on the sensor itself. The dishwasher may interrupt or modify its wash cycle when this fault is active.
How do I fix an F8 error on my GE dishwasher?
Start by inspecting the turbidity sensor wiring harness for loose connectors, corrosion, or damaged wires. Also check the sensor lens in the sump area for grease or debris buildup and clean it if necessary. If the harness and sensor appear physically intact and clean, replacing the turbidity sensor is the recommended next step to resolve the fault.
Is it safe to run my GE dishwasher with an F8 error code?
An F8 error does not indicate a water leak or electrical hazard, so it is not a safety emergency. However, running the dishwasher with a faulty turbidity sensor means the control board cannot accurately monitor wash water conditions, which can result in poor cleaning performance or incomplete cycle execution. It is best to diagnose and repair the issue before continued use.
Will resetting my GE dishwasher clear the F8 error?
A reset may temporarily clear the F8 code from the display, but if the underlying problem with the turbidity sensor or its wiring has not been addressed, the error will return during the next wash cycle. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and repairing the root cause.
How much does it cost to fix a GE dishwasher F8 error?
If the fix is simply cleaning the sensor lens or reseating a loose harness connector, the repair costs very little beyond your time. If the turbidity sensor itself needs replacement, parts typically range from around $20 to $60 depending on the model, with additional labor costs if a technician performs the repair. Total professional repair costs for this type of fault generally fall in the range of $100 to $200.

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