Bosch Washer Error Code F:42

F:42 on a Bosch washer means the control board detected an uncontrolled run-up of the drum motor, caused by a broken Triac on the control board. The Triac is the component responsible for regulating motor speed, and when it fails, the motor can spin up without proper control. Bosch stores this as a remanent error, meaning it stays in memory even after the machine is unplugged. The washer shuts down to prevent mechanical damage.

Because F:42 is classified as a remanent error, it is stored in the control board's memory and requires activation of the test mode to reset it, not just a simple power cycle. Even after a successful reset, if the underlying Triac fault remains, the error will return as soon as the motor attempts to run. A reset alone does not fix the root cause.

Repair costs depend on whether you pursue DIY or professional service. A replacement main control board for a Bosch washer typically ranges from $150 to $350 for the part alone, depending on the model. Professional diagnosis and installation can add $100 to $200 or more in labor costs, bringing the total repair estimate to a range of $250 to $550 in most cases.

The first step is to enter the washer's test mode to reset the stored error and see if the fault returns. If the error comes back, the repair involves replacing the main control board, which requires comfort working with appliance electronics and proper handling of circuit board components. DIY replacement is possible for experienced individuals, but given the nature of the fault and the cost of the part, many homeowners choose professional service.

No, you should not continue using the washer while F:42 is present. An uncontrolled motor run-up can cause the drum to spin at unsafe speeds, potentially damaging internal components or creating a safety hazard. The washer's control system halts operation for this reason, and the fault should be diagnosed and repaired before resuming normal use.