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Error code reference

GE Dishwasher Error Code F27

Check harness or inverter.

GE codesGE dishwasher codes

Check harness or inverter.

First step from the service manual

Check harness and replace inverter if harness is OK.

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

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What F27 means on a GE dishwasher

The F27 error code on a GE dishwasher indicates a fault within the inverter circuit or a wiring problem between the control board and the inverter. The inverter is responsible for converting DC voltage to the variable-frequency AC power that drives the wash motor at different speeds. When the control board detects an abnormal signal or no communication from the inverter, it triggers this fault code and halts the wash cycle to prevent damage to the motor or drive components.

The diagnostic process begins with a thorough inspection of the wiring harness that connects the inverter to the main control board. Technicians should check for loose connectors, damaged wire insulation, corroded terminals, or pinched wires that may have resulted from vibration during normal operation. If the harness passes visual and continuity inspection and all connections are secure and clean, the inverter itself is the likely failed component and should be replaced.

Inverter failures can occur due to power surges, moisture intrusion, or general component wear over time. Because the inverter handles the high-frequency switching signals that control motor speed, even minor electrical issues can cause the control board to register this fault. Clearing the code without addressing the underlying cause will typically result in the error returning once the machine attempts to run the wash motor again.

Source: manufacturer service documentation.

Common causes of F27

  1. 01

    Loose or damaged wiring harness

    Wiring / connection

    Vibration over time can loosen connectors or chafe wire insulation on the harness running to the inverter. Inspect all connectors and wires for corrosion, breaks, or poor seating before condemning the inverter.

  2. 02

    Failed inverter

    Part replacement

    The inverter itself can fail due to power surges, overheating, or normal wear. If the harness checks out with no visible damage and good continuity, the inverter should be replaced.

  3. 03

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture inside the dishwasher cabinet can cause terminal pins at the inverter connector to oxidize, increasing resistance and breaking communication with the control board. Cleaning or replacing the connector may resolve the fault.

  4. 04

    Power surge damage

    Part replacement

    A voltage spike can damage the inverter's internal components without any obvious external signs. If the error appeared after a power event, the inverter is a strong suspect even if the harness appears intact.

See the test procedure for each cause

Frequently asked questions about F27

What does F27 mean on a GE dishwasher?
F27 on a GE dishwasher indicates a problem with the inverter or the wiring harness connected to it. The inverter controls the wash motor speed, and this code appears when the control board cannot communicate with it properly. The dishwasher will stop operating until the fault is resolved.
How do I fix the F27 error on my GE dishwasher?
Start by inspecting the wiring harness that connects to the inverter, looking for loose connectors, damaged wires, or corroded terminals. If the harness is in good condition and all connections are secure, the inverter will need to be replaced. This repair typically requires some disassembly of the dishwasher, so comfort with appliance repair is recommended before attempting it yourself.
Will resetting my GE dishwasher clear the F27 code?
A reset may temporarily clear the F27 code, but it will return as soon as the dishwasher tries to run the wash motor again if the underlying problem has not been fixed. Resetting without repairing the harness or inverter is not a lasting solution. The fault must be addressed at the hardware level to permanently clear the code.
Is it safe to use my GE dishwasher when the F27 code is showing?
No, you should not continue running the dishwasher while F27 is active. The machine has stopped the cycle because it detected a fault in the inverter circuit, and forcing operation could cause further damage to the motor or control board. It is best to leave the dishwasher off until the wiring and inverter have been inspected and repaired.
How much does it cost to repair a GE dishwasher with an F27 error?
Repair costs depend on whether the problem is limited to the wiring harness or requires inverter replacement. A wiring repair or connector cleaning is generally inexpensive, often in the range of $50 to $150 if done by a technician. Inverter replacement parts and labor combined can range from $150 to $350 or more depending on the specific model and local labor rates.

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