GE Oven Error Code F78

The F78 code means the oven's control board has detected a fault with the T012 glass touch input panel. The board is not receiving valid signals from the glass touch assembly, which is the surface you use to enter cooking settings. This can be caused by a loose wiring harness connector or a failed glass touch panel.

In most cases, you cannot use the oven normally with F78 active because the glass touch panel is the primary input method for setting temperature and cooking modes. If the touch surface is unresponsive, you will not be able to start or control the oven. Stop using the appliance until the fault is resolved to avoid any unintended operation.

A power reset by unplugging the oven for 30 seconds may temporarily clear the F78 code, but it will return if the underlying fault with the T012 glass touch assembly or its wiring harness is not fixed. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. Address the wiring connections first before assuming the glass touch panel itself needs replacement.

Start by unplugging the oven and locating the harness connectors between the T012 glass touch assembly and the control board. Disconnect and firmly reseat each connector, then restore power and check if the code clears. If F78 returns, the glass touch assembly itself needs to be replaced. The part is typically accessible from the front of the control panel after removing a few screws.

If the fix is just reseating a loose harness connector, there is no parts cost. If the T012 glass touch assembly needs replacement, the part typically ranges from $80 to $200 depending on the specific GE model. Professional repair labor adds roughly $100 to $200 on top of that. This is a repair many homeowners can handle themselves if comfortable with basic appliance disassembly, since it mainly involves disconnecting a harness and swapping the panel.