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Error code reference

GE Range Error Code F105

Wake up procedure failure between OUI and GPU; the OUI can't communicate with the GPU at power up.

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Wake up procedure failure between OUI and GPU; the OUI can't communicate with the GPU at power up.

First step from the service manual

Cycle the power for 30 seconds.

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

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What F105 means on a GE range

The F105 error code on a GE range indicates a wake-up procedure failure between two internal control modules: the OUI (Oven User Interface) and the GPU (Gas Processing Unit or general power unit, depending on model). At power-up, these two modules are designed to establish communication with each other through a defined handshake sequence. When the OUI fails to receive an acknowledgment from the GPU during this initialization window, the range logs F105 and halts normal operation to prevent unsafe or undefined behavior.

This type of error is fundamentally a communication fault rather than a component failure in the traditional sense. The failure can stem from a corrupted control board, a loose or damaged wiring harness connecting the two modules, or a brief power anomaly that interrupted the boot sequence before communication could be established. Because the error occurs specifically at power-up, transient electrical disturbances such as power surges or momentary outages are common triggers.

The first and most important diagnostic step is to cycle the power completely for 30 seconds by unplugging the range or shutting off the breaker. This clears the volatile memory states on both modules and forces a fresh wake-up sequence. If the error returns immediately after restoring power, the fault is more persistent and points toward a hardware issue: a failed OUI board, a failed GPU board, or wiring between them that is open, shorted, or intermittently connected.

Source: manufacturer service documentation.

Common causes of F105

  1. 01

    Transient power disruption at startup

    Wiring / connection

    A brief power surge, outage, or brownout can interrupt the wake-up handshake between the OUI and GPU before it completes. Cycling power for 30 seconds allows both modules to reset and attempt communication again cleanly.

  2. 02

    Loose or damaged wiring harness between OUI and GPU

    Wiring / connection

    If the ribbon cable or connector harness linking the two control modules is unseated, pinched, or corroded, communication signals cannot pass reliably. Inspect connectors on both boards for bent pins, corrosion, or incomplete seating.

  3. 03

    Failed OUI (Oven User Interface) board

    Part replacement

    The OUI board may have failed internally, preventing it from initiating or completing the wake-up sequence. If the display is blank or unresponsive even after a power reset, the OUI board is a likely suspect.

  4. 04

    Failed GPU control board

    Part replacement

    If the GPU module is not responding to the OUI during power-up initialization, the GPU itself may have failed. This would cause F105 to return consistently regardless of how many times power is cycled.

  5. 05

    Corrupted firmware or memory on a control module

    Part replacement

    In some cases, a control board's onboard memory can become corrupted due to a power event, causing the board to fail its own startup routine before communication is even attempted. Replacement of the affected board is typically required.

See the test procedure for each cause

Frequently asked questions about F105

What does F105 mean on a GE range?
F105 indicates a wake-up procedure failure between the OUI (Oven User Interface) and the GPU control module. At power-up, these two boards are supposed to establish communication with each other, and F105 appears when that handshake fails. The fault can be caused by a power glitch, a wiring issue, or a failed control board. Cycling the power for 30 seconds is the first recommended step.
Will resetting the power clear the F105 error on my GE range?
It can, and it is always the first step to try. Unplug the range or turn off its circuit breaker for 30 seconds, then restore power. If the error was triggered by a transient power disruption, the reset will allow both control modules to re-initialize and communicate successfully. If F105 returns immediately after the reset, a hardware fault is likely present and further diagnosis is needed.
Is it safe to use my GE range while it is showing the F105 error?
No, it is not advisable to operate the range while F105 is active. The error means the control system did not complete its startup correctly, and the range may not respond predictably to inputs. On a gas model in particular, using the appliance with an unverified control state creates a safety risk. Clear the error first and confirm normal operation before using the range.
How much does it cost to repair a GE range F105 error?
If the error clears with a power reset, there is no parts cost at all. If a control board requires replacement, parts alone typically range from around 100 dollars to 350 dollars or more depending on the specific board and model. Adding professional labor, total repair costs generally fall in the range of 200 dollars to 550 dollars. Getting a diagnosis from a qualified technician before ordering parts is recommended to confirm which module has failed.
How do I diagnose whether the OUI or the GPU is the faulty component causing F105?
Start by inspecting the wiring harness and connectors between the two boards for any loose, corroded, or damaged connections, since a wiring fault is a less expensive fix than board replacement. If the display is completely dead or unresponsive, the OUI board is a likely culprit. If the display powers on but the range still logs F105 after a fresh power cycle, the GPU module should be evaluated. A technician with the appropriate diagnostic tools can check communication signals at each board to pinpoint the failed component.

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