Error code reference

GE Oven Error Code F79

Machine Control lower oven sensor fault

GE codesGE oven codes

Machine Control lower oven sensor fault - open or shorted sensor circuit.

First step from the service manual

Measure resistance of sensor circuit on Machine Control board connector J3 pins 3 to 4 (white to white/red).

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

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What F79 means on a GE oven

F79 on a GE oven indicates the control board has detected a fault with the T012 glass touch input panel. The control board continuously monitors the glass touch interface for valid signals. When the board receives no response, an erratic signal, or an out-of-range reading from the T012 glass touch, it sets F79 and typically locks out operation. The first diagnostic step is always the wiring harness connection between the glass touch and the control board, since a loose or damaged connector can mimic a failed touch panel.

For homeowners, this error means the oven's touch control surface is not communicating correctly with the main control board. The glass touch panel is the surface you press to enter temperatures, select cook modes, and start the oven. When it stops sending proper signals, the oven cannot safely accept commands and shuts down to prevent unintended operation. The fix is usually either reseating a loose wire connector or replacing the glass touch panel itself.

This code is not triggered by a cooking-related issue like a temperature sensor fault. It is strictly an input communication problem with the touch interface hardware. Resolving it requires inspecting the wiring harness first, and if connections are solid, replacing the T012 glass touch panel.

Source: manufacturer service documentation.

Common causes of F79

  1. 01

    Loose or unseated wiring harness connector at the glass touch

    Wiring / connection

    The harness plug connecting the T012 glass touch to the control board can loosen over time due to vibration or heat cycling. A poor connection interrupts the communication signal and triggers F79 without any failure of the components themselves.

  2. 02

    Damaged or shorted wiring harness

    Part replacement

    Wires in the harness routed near sharp edges or heat sources can develop cuts, pinches, or shorts. Physical damage to the wiring can corrupt the signal between the T012 glass touch and the control board, causing a persistent F79 even when plugs appear seated.

  3. 03

    Failed T012 glass touch panel

    Part replacement

    The glass touch panel itself can fail due to moisture intrusion, physical cracking, or internal component failure. When the panel stops producing valid input signals, the control board logs F79 and the panel must be replaced to restore function.

  4. 04

    Faulty main control board

    Part replacement

    In rare cases where a confirmed-good T012 glass touch and intact wiring harness still produce F79, the main control board's input circuit may be damaged. This is the least likely cause and should only be considered after ruling out the harness and touch panel.

See the test procedure for each cause

Frequently asked questions about F79

What does F79 mean on a GE oven?
F79 means the oven's control board has detected a fault with the T012 glass touch input panel. The board is not receiving a valid signal from the touch surface, which prevents the oven from accepting user input. The fault can stem from a loose wiring harness connection or a failed glass touch panel.
How do I fix F79 on a GE oven?
Start by unplugging the oven or turning off the breaker, then accessing the control panel area to check that the harness plugs connecting the T012 glass touch are fully seated and that no wires are visibly damaged. If the connections are secure and undamaged, the next step is replacing the T012 glass touch panel. If replacing the glass touch does not clear the code, the main control board may need replacement.
Can I still use my GE oven with an F79 error code?
No. F79 locks out the touch interface, meaning the oven will not accept input commands for temperature or cook mode selection. Attempting to operate the oven in this state is not possible through normal controls. The fault must be resolved before the oven can be used safely.
How much does it cost to fix F79 on a GE oven?
If the fix is simply reseating a loose harness connector, there is no parts cost. A replacement T012 glass touch panel typically ranges from $50 to $150 depending on the specific GE model. If the main control board is also at fault, boards can range from $100 to $250 or more. Professional labor for this repair generally runs one to two hours, so factor in $100 to $200 for service if you are not doing it yourself.
Will resetting my GE oven clear the F79 error?
A power reset by unplugging the oven or tripping the breaker for 30 seconds may temporarily clear the F79 display, but the code will return if the underlying problem with the T012 glass touch or its wiring harness is not corrected. A reset is useful for confirming whether the fault is intermittent, but it is not a repair.

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