Bosch Range Error Code F43

F43 means the motorized door latch failed to move to the unlocked position when the control commanded it to do so. The control board monitors a feedback switch with contacts A and B to confirm latch movement, and when that confirmation is not received, F43 is set. As a safety measure, the oven shuts off all heating functions when this code is active. The door will typically remain locked until the underlying fault is resolved.

When F43 is active, Bosch disables all heating functions automatically, so the oven cannot heat even if you attempt to start a cook cycle. The door will also remain locked. This means the oven is not usable for cooking until the fault is repaired, but there is no immediate safety hazard from the error itself since heating is already disabled.

Repair costs vary depending on which component has failed. A replacement latch feedback switch typically runs in the range of $20 to $60 for the part alone. A latch motor assembly can cost between $50 and $150 in parts. If the control board is the root cause, parts alone can range from $150 to $400 or more. Adding professional labor, total repair costs commonly fall between $150 and $500 depending on the diagnosis and your location.

Cycling power to the oven may temporarily clear the error code display, but if the latch mechanism, feedback switch, motor, or wiring fault is still present, F43 will return as soon as the control attempts to operate the latch again. A reset is not a repair. The latch system needs to be inspected and the underlying cause corrected before the error will stay clear.

Start by checking whether the latch motor rotated and whether the feedback switch contacts A and B changed state during the unlock command. If the motor did not rotate, check for voltage at the motor and inspect the wiring harness for breaks or loose connectors. If the motor ran but the switch did not respond, the feedback switch likely needs replacement or realignment. A seized latch mechanism should be inspected for debris or damage before replacing electrical components.