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Error code reference

GE Dishwasher Error Code AcF

High supply voltage

GE codesGE dishwasher codes

High supply voltage - supply voltage is greater than 170V (critical fault).

First step from the service manual

Check the supply voltage.

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

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What AcF means on a GE dishwasher

The AcF error code indicates the GE dishwasher control board has detected a critical high supply voltage fault. Specifically, the board's voltage monitoring circuit has measured incoming AC supply voltage exceeding 170 volts, which is above the safe operating threshold for the dishwasher's electronics and motor systems. This is flagged as a critical fault, meaning the machine will not operate until the condition is resolved. The fault originates at the point where household electrical supply enters the appliance.

For homeowners, this means the dishwasher is detecting that the electricity coming into it is running too high. Standard US residential voltage should be around 120V for this type of appliance. When the incoming voltage climbs significantly above that, the dishwasher shuts itself down to prevent damage to its internal components, including the control board, motor, and heating element. The AcF code is the machine's way of protecting itself from an electrical condition that could destroy expensive parts or create a safety hazard.

The cause is almost always external to the dishwasher itself. A problem at the home's electrical panel, a failing utility transformer on your street, or a wiring fault in the dedicated circuit feeding the dishwasher can all produce abnormally high voltage. Confirming the actual supply voltage with a multimeter at the outlet or junction box is the necessary first step before inspecting any component inside the appliance.

Source: manufacturer service documentation.

Common causes of AcF

  1. 01

    Utility or transformer overvoltage event

    Wiring / connection

    A fault or fluctuation at the local utility transformer can push residential supply voltage well above normal levels. This affects all appliances on the affected circuit or throughout the home simultaneously.

  2. 02

    Wiring fault in the home's electrical panel or circuit

    Wiring / connection

    A miswired circuit, failed neutral connection, or panel fault can cause voltage on one leg of the electrical system to spike abnormally. This can result in sustained high voltage being delivered to the dishwasher's supply line.

  3. 03

    Faulty dedicated circuit outlet or junction box wiring

    Wiring / connection

    Loose, corroded, or incorrectly wired connections at the outlet or hardwired junction box feeding the dishwasher can produce voltage irregularities that read as high supply voltage at the control board.

  4. 04

    Failed or damaged control board voltage monitoring circuit

    Part replacement

    If the supply voltage measures normal at the junction box but the AcF code persists, the control board's internal voltage sensing circuit may be defective, causing it to report a false high-voltage reading. This is the least common cause but possible after a prior power surge.

See the test procedure for each cause

Frequently asked questions about AcF

What does the AcF error code mean on a GE dishwasher?
AcF means the dishwasher's control board has detected supply voltage greater than 170 volts, which it flags as a critical high-voltage fault. The dishwasher shuts down to protect its internal components, including the control board and motor, from damage. The issue is almost always in the home's electrical supply rather than inside the dishwasher itself.
Is it safe to use my GE dishwasher when the AcF code is showing?
No. The AcF code is a critical fault and the dishwasher will not run while it is active. Even if you could bypass it, running the appliance under high supply voltage conditions risks permanently damaging the control board, heating element, and motor, and creates a potential electrical hazard. Do not attempt to use the dishwasher until the supply voltage has been confirmed normal and the code is cleared.
How do I fix the AcF error code on my GE dishwasher?
Start by measuring the supply voltage at the outlet or junction box feeding the dishwasher using a multimeter. It should read approximately 120V AC for a standard residential installation. If voltage is significantly elevated, contact your utility provider to report a possible transformer issue, or have a licensed electrician inspect your electrical panel and circuit wiring. If supply voltage is normal and the code returns after resetting the dishwasher, the control board's voltage sensing circuit may be faulty and the board will need replacement.
How much does it cost to fix a GE dishwasher AcF error code?
If the cause is a utility overvoltage event, there may be no cost to you beyond the service call. If a licensed electrician needs to correct a wiring fault in your panel or circuit, expect to pay roughly 150 to 400 dollars depending on the scope of work. If the dishwasher's control board has failed and needs replacement, the part typically costs 100 to 250 dollars, with labor adding another 100 to 200 dollars if a technician performs the repair.
Will resetting my GE dishwasher clear the AcF code?
You can reset the dishwasher by cutting power at the circuit breaker for one minute and restoring it, but if the underlying supply voltage condition still exists, the AcF code will return immediately or during the next cycle. A reset is useful for confirming whether the fault was caused by a temporary voltage spike, such as a brief utility fluctuation, versus an ongoing electrical problem that requires diagnosis and repair.

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