Thermador Range Error Code F50

F50 indicates that the upper oven door latch signal circuit is shorted low, meaning the control is reading an abnormally low voltage from the latch switch input. The system monitors this signal to confirm whether the upper oven door is properly latched, especially during self-clean operation. The fault points to a possible wiring short, a bad door latch switch, a loose connector at headers P9 or P11, or a failed power/relay board.

It is not recommended to use the range while F50 is active, particularly for self-clean cycles, since the control cannot reliably confirm the door latch status. A shorted latch signal could affect how the control manages high-temperature operations. Disconnect power and address the fault before resuming normal use.

Disconnecting power to the range for several minutes may temporarily clear the F50 code, but if the underlying short or wiring fault is still present, the code will return once power is restored and the control re-checks the latch circuit. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. The root cause in the wiring, switch, or board must be resolved to permanently clear the error.

A knowledgeable DIYer can start by checking the connectors at header P9 on the power/relay board and header P11 on both the power/relay board and the control display PCB, and by inspecting the wiring harness for pinched or damaged wires. Testing the door latch switch for correct operation is also within reach for someone comfortable with a multimeter. If those checks do not resolve the fault, replacing the power/relay board is the next step and typically requires a technician familiar with Thermador range electronics.

If the issue is a pinched wire or a loose connector, the repair cost may be minimal, covering only a service call fee in the range of $75 to $150. A replacement door latch switch typically costs between $30 and $80 for the part. If the power/relay board requires replacement, expect part costs in the range of $150 to $400 or more, plus labor, bringing the total repair estimate to $250 to $600 depending on your location and service provider.