When your Bosch washer won't stop, the most likely cause is water siphoning from the tub. Check that the drain hose ends 30 to 36 inches above the floor, is not sealed tightly in the standpipe, and is not pushed too far down the drain. Improper hose placement can make the washing machine keep running as it repeatedly tries to fill. If the washer drains normally but remains stuck on a cycle, a defective control board is the next likely cause. Inspect the control board for burn marks or shorted components, though it cannot be tested easily. A failed main control board can cause the same washer keeps running symptom. If both boards appear normal, test the timer with a multimeter and the wiring diagram, then replace it if defective. Before ordering, enter your Bosch washer model number to find the exact replacement part for your specific machine. Repair Clinic carries Bosch control boards, main control boards, and timers to help repair a washer not stopping without replacing the entire appliance.
01 - Water siphoning from tub
If the water is siphoning from the tub the outlet end of the drain hose is likely lower than the water level in the tub. The drain hose should terminate between 30 inches to 36 inches (77 centimeters to 92 centimeters) above the floor, depending on the model, in a standpipe or laundry tub. If the drain hose is sealed at the top of the standpipe or excess hose is pushed too far down into the pipe, siphoning can also occur.
Common
02 - Bosch Washing Machine Control Board
If the washer can successfully drain the water from the tub then a defective control board could be responsible for the washer not stopping. The control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component to help determine if the part should be replaced.
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If the washer can successfully drain the water from the tub then a defective main control board could be responsible for the washer not stopping. The main control board cannot be easily tested, but you can try to inspect it for signs of burning or a shorted-out component to help determine if the part should be replaced.
If the washer can successfully drain the water from the tub then a defective timer could be responsible for the washer not stopping. You can test the timer by using a multimeter and consulting the wiring diagram. If the timer is defective, replace it.