GE Refrigerator Error Code F123

Error code F123 on a GE refrigerator indicates that the control system has simultaneously detected a closed freezer compartment door and an active key input signal from the temperature control board. This condition is contradictory under normal operation: key inputs on the temp board are typically intended to be registered during user interaction, which should not coincide with a persistently closed door in a way that triggers a fault. The control board monitors both door switch states and user interface inputs, and when these signals conflict or appear in an unexpected combination, the system logs F123 to flag the anomaly.

The temperature board referenced in this code is the user interface or control panel board that receives button presses and communicates setpoint changes to the main control board. The door closed signal comes from the door switch, a small mechanical or magnetic switch mounted in the door frame. If either of these components is sending a continuous or false signal, the control system can interpret the condition as a fault. A stuck button on the control panel, a shorted key matrix on the temp board, or a door switch that is stuck in the closed position are all hardware-level causes that can trigger this code.

Additionally, wiring harness issues between the temperature board, door switch, and main control board can introduce signal interference or short circuits that mimic the fault condition. In some cases, moisture intrusion into the control panel or door switch housing can cause unintended continuity across contacts, producing the same erroneous signal combination. Diagnosing this code requires isolating each component to determine whether the fault originates at the door switch, the temp board itself, or the wiring connecting them.