Thermador Range Error Code F45

F45 on a Thermador range means the control system is detecting that the upper oven motorized door latch is reporting both a locked and an unlocked condition at the same time. This contradiction is usually caused by a wiring problem, a faulty connector at the Power Board, or a failed latch switch. The oven cannot safely proceed when it cannot confirm the actual latch position, so it displays F45 and stops operation.

The F45 code relates to the door latch system, which is a safety-critical component for self-clean cycles. You should not attempt a self-clean cycle while this code is active, as the oven cannot confirm whether the door is properly locked. Basic cooktop use may still be possible, but it is best to resolve the error before using any oven functions to avoid potential safety issues.

Repair costs depend on which component is at fault. If the issue is a reseated connector or corrected wiring pinch, a service call fee in the range of $100 to $200 may be all that is needed. Replacing a door latch assembly typically adds $150 to $350 in parts and labor, while a Power Board replacement can bring total costs into the $300 to $600 range or higher depending on your location and the specific model.

Some steps are accessible to a knowledgeable DIYer, such as visually inspecting the wiring harness for pinched or damaged wires and checking that the P4 connector on the Power Board is fully seated and free of corrosion. However, testing individual latch switches and replacing the Power Board typically requires disassembly of the range and comfort working with electrical components, so many homeowners prefer to call a qualified appliance technician for this repair.

A power reset by turning off the circuit breaker for 30 to 60 seconds may temporarily clear the F45 code, but it will almost certainly return if the underlying cause has not been addressed. The code is generated by a real hardware condition: a conflict between the latch switch signals. Clearing the error without fixing the wiring, connector, or latch components will only provide a brief reprieve.