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Error code reference

GE Dishwasher Error Code F1

Failed turbidity sensor: HIGH SIGNAL

GE codesGE dishwasher codes

Failed turbidity sensor: HIGH SIGNAL – bad sensor or intermittent connection (displayed during F1 test only).

First step from the service manual

Replace turbidity sensor or repair intermittent connection.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F1 means on a GE dishwasher

The F1 error code indicates the main control (MC) board has lost communication with the user interface (UI) board. These two boards exchange signals continuously during operation; when the MC board detects a break or failure in this communication link, it triggers F1 and halts the cycle. The fault can originate from a damaged wiring harness between the two boards, a failed connector, or a defective UI or MC board itself.

For homeowners, the UI board is the panel you interact with to select cycles and options, while the MC board is the brain inside the dishwasher that actually runs the machine. When these two components cannot talk to each other, the dishwasher does not know what you have selected and cannot safely operate. You may notice the dishwasher stops mid-cycle, displays F1, or becomes completely unresponsive to button presses.

Before assuming either board has failed, check the wiring harness that connects the UI board to the MC board. Loose, corroded, or pinched connectors are a frequent cause of this fault and can often be resolved without replacing any parts. If reseating the connectors does not clear the error, one or both boards likely need replacement.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Loose or disconnected harness between UI board and MC board

    Wiring / connection

    The wiring harness connecting the UI board to the MC board can work loose over time from vibration or door movement. A poor connection interrupts the communication signal and triggers F1.

  2. 02

    Damaged or corroded wiring harness

    Part replacement

    Wires in the harness between the UI and MC boards can fray, corrode at the connectors, or develop breaks, preventing consistent signal transmission. Physical damage to the harness requires replacement of the harness assembly.

  3. 03

    Failed user interface (UI) board

    Part replacement

    If the UI board itself has failed due to a power surge, moisture intrusion, or component wear, it will not respond to the MC board's communication attempts, resulting in a persistent F1 error even after harness connections are verified.

  4. 04

    Failed main control (MC) board

    Part replacement

    A faulty MC board may be unable to initiate or maintain communication with the UI board. This is the least common cause of F1 but should be considered after the harness and UI board have been inspected and confirmed functional.

See the test procedure for each cause

Frequently asked questions about F1

What does the F1 error code mean on a GE dishwasher?
F1 on a GE dishwasher means the main control (MC) board has detected a communication failure with the user interface (UI) board. These two boards must exchange signals for the dishwasher to accept your input and run cycles. When communication is lost, the machine stops and displays F1. The fault is usually in the wiring harness between the two boards, though either board can also be the source.
How do I fix the F1 error code on my GE dishwasher?
Start by disconnecting power to the dishwasher for one minute, then restore power to see if the error clears. If F1 returns, access the UI board and MC board and inspect the wiring harness that connects them. Reseat all connectors firmly and check for any bent pins, corrosion, or damaged wires. If the harness looks intact and connections are secure but F1 persists, one of the two boards is likely defective and will need to be replaced.
Is it safe to use my GE dishwasher when it shows an F1 error?
No. When F1 is active, the MC board and UI board are not communicating, which means the dishwasher cannot reliably receive or execute commands. Running the machine in this state risks an incomplete or uncontrolled cycle. Stop using the dishwasher until the communication fault is diagnosed and resolved.
How much does it cost to repair an F1 error on a GE dishwasher?
If the fix is simply reseating a loose harness connector, there is no parts cost. A replacement wiring harness typically runs $20 to $60 in parts. A new UI board generally costs $80 to $200, and a main control board can range from $100 to $300, depending on the model. If you hire a technician, expect to add $100 to $150 in labor. Checking and reseating connections yourself first is a reasonable first step before spending money on parts.
Can a power reset fix the F1 code on a GE dishwasher?
A power reset can clear F1 if the error was caused by a temporary communication glitch rather than a hardware fault. Turn off the dishwasher at the circuit breaker or unplug it for 60 seconds, then restore power. If F1 comes back immediately or after the next cycle attempt, the underlying cause is a physical problem with the harness or one of the boards, and a reset alone will not resolve it.

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