GE Range Error Code 742

Error code 742 means the door lock on Cavity 1 changed states unexpectedly, without a command from the oven's control system. The control board monitors the lock's position at all times, and when it detects an unplanned state change, it triggers this fault code. The issue typically points to a problem with the door lock assembly, its wiring harness, or the connector between them.

Using the range for standard cooktop burners may be possible in some cases, but operating the oven cavity while a door lock fault is present is not advisable. An unreliable door lock creates uncertainty about whether the oven is properly secured, especially during high-heat operation. It is best to resolve the fault before running any oven function, particularly self-clean.

Start by pressing Cancel to reset the system and observe whether the error returns. Next, inspect the wiring harness and connector at the door lock assembly, looking for loose pins, corrosion, broken wires, or heat damage to the insulation. If the harness appears intact, the lock assembly itself may need to be tested or replaced. Any inspection involving internal oven components should be done with the range unplugged from power.

Pressing Cancel is the recommended first step and may reset the error if it was triggered by a temporary glitch. However, if the underlying cause is a failing lock assembly or a damaged wiring harness, the code will likely return after the reset. If the error reappears, a physical inspection of the lock mechanism and harness is needed.

If the fix involves only cleaning connectors or reseating a loose harness, the repair cost may be minimal, primarily your time. Replacing the door lock assembly typically costs between $80 and $200 in parts depending on the specific model, plus labor if a technician performs the work. A control board replacement, if needed, can range from $150 to $400 or more in parts alone.