Bosch Range Error Code F91

F91 means the oven's door lock system exceeded its maximum number of unlock attempts during or after a self-clean cycle or lockout operation. The control module tried repeatedly to unlock the door and could not confirm a successful unlock position. The fault points to either the lock motor, the lock position switch, or the wiring connecting them to the control module.

You should not use the oven until the lock issue is resolved, particularly if the door remains physically locked. Attempting to force the door open can damage the latch assembly further. Surface burners on a gas or electric range may still function, but running bake or broil cycles with a faulty door lock system is not recommended.

Repair costs vary depending on which component has failed. A lock motor or lock switch assembly typically costs between $40 and $120 for the part alone. Adding professional labor, total repair costs generally range from $150 to $350. A failed control module is the most expensive scenario and can push costs higher. Diagnosing the specific failed component before ordering parts will help avoid unnecessary expenses.

Cutting power to the oven at the breaker for several minutes may clear the fault code temporarily, but F91 will return if the underlying problem with the lock motor or switch is not repaired. A reset does not fix the hardware failure. If the door is currently locked, do not run another self-clean cycle until the lock system is diagnosed and repaired.

Start by checking whether the lock motor runs when the oven attempts to unlock. If it runs, test continuity of the wiring and the lock switch on the motor assembly. If the motor does not run, test the motor winding continuity with a multimeter. Replace whichever component fails its continuity test, or repair any broken wiring. If all components test good, the control module may need evaluation.