GE Range Error Code F3x (door lock)

The F3x door lock error on a GE range indicates that both the Lock Home switch and the Unlock Home switch within the door lock assembly are reading as closed at the same time. Under normal operation, these two switches work in opposition: when the door is fully locked, the Lock Home switch closes and the Unlock Home switch opens, and vice versa. The control board uses this opposing signal logic to confirm the actual position of the lock cam. When both switches report a closed state simultaneously, the board receives a contradictory signal it cannot resolve, and the F3x fault is triggered.

The most common physical cause is a failed or stuck lock motor cam switch. The cam is driven by a small motor and rotates to actuate one switch at a time. If the cam becomes physically stuck in a mid-travel position, or if the switch mechanism itself fails with its contacts welded or jammed closed, both switches can appear closed to the control board. This is a mechanical failure of the lock assembly and typically requires replacing the entire door lock assembly as a unit.

If the lock assembly inspects as mechanically sound and the cam moves freely through its full range, the fault may originate in the RPSM main control board itself. A failed triac, damaged input circuit, or corrupted logic on the board can cause it to misread switch states regardless of actual switch positions. In that case, replacing the main board is the appropriate next step. Technicians should confirm wiring integrity and switch continuity before condemning the board.