Bosch Oven Error Code F143

F143 indicates an open circuit on the Vcc supply line to the slave microcontroller in the oven's control system. The fault points to either the Power Board, the Display Board, or the wiring and connectors between them. The first step is to inspect connector P1B on the Display Board and its associated wiring for loose or damaged connections.

You should not attempt to operate the oven while F143 is active. The error indicates a failure in the control system's power supply circuit, which means the oven may not function or respond correctly. Continuing to use the appliance in this condition could mask further damage or create unsafe operating conditions.

Repair costs vary depending on the root cause. If only a connector needs reseating, the cost is minimal. Replacing the Display Board or Power Board typically involves parts costs ranging from roughly $100 to $350 or more depending on the model, plus labor if a technician is hired. Getting a diagnostic assessment before ordering parts helps avoid unnecessary expenses.

Checking and reseating connector P1B and inspecting the wiring harness is something a knowledgeable DIYer can attempt after disconnecting power to the oven. However, if the fault lies in the Power Board or Display Board, replacing those components requires comfort working with oven electronics and sourcing the correct replacement parts. If you are unsure, a qualified appliance technician is the safer option.

Resetting the oven by cutting power at the breaker and restoring it may temporarily clear the code, but if the underlying fault in the wiring, Power Board, or Display Board is still present, the error will return. A reset alone does not fix the open circuit condition that triggers F143.