Bosch Oven Error Code E124

E124 on a Bosch oven indicates a door switch error for Cavity 1, the upper or single oven cavity. The control board is receiving a signal from the door switch that does not correspond to a valid open or closed position. This undefined state prevents the oven from operating normally. The fault is most commonly caused by a defective door switch, a loose wiring connector, or damage to the switch circuit wiring.

It is not advisable to continue using the oven while E124 is active. The door switch provides the control board with safety-critical position data used to regulate heat cycles and prevent hazardous operation with the door in an unknown state. Operating the oven with an undefined door switch signal could result in unexpected behavior during cooking or self-clean cycles. The fault should be diagnosed and resolved before resuming use.

Repair costs vary depending on the root cause. If the fix involves reseating a connector or cleaning a terminal, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the door switch itself generally adds $20 to $80 in parts depending on the model. If the control board requires replacement, total repair costs including parts and labor can range from $300 to $600 or more.

A knowledgeable DIYer can inspect the door switch wiring connectors for looseness or corrosion and reconnect or clean them without specialized tools. However, testing the door switch contacts for proper continuity requires a multimeter, and replacing the switch or tracing wiring faults using the circuit diagram requires comfort working around oven electrical components. If the control board is suspected, professional service is strongly recommended.

A power reset by switching off the oven at the circuit breaker for several minutes may temporarily clear the E124 code if the fault was caused by a transient signal issue. However, if the underlying cause is a failing door switch, damaged wiring, or a loose connector, the error will return during normal operation. A reset alone is not a repair and should only be used as part of the diagnostic process.