SOURCE: Frigidaire dishwasher does not clean
the start switch in the motor is probably bad,it could also be the motor relay.if you can get to the motor run the unit and while it hums try to turn the motor.it also could be something is stuck in the motor let me know.
SOURCE: Dishwasher making loud humming noise
The most common cause of the hum/grinding sound, and often poor cleaning - is a blocked filter or debris stuck below that filter.
Pretty easy fix:
Get a phillips screwdriver near by. Pull out the lower rack (the upper rack can come out if you pull the little gray thingeys on the front of the upper rails.)
Remove the lower spray arm -- just pull it straight up.
Remove nine silver screws from the sump area that holds the filter down. Pull the filter up and out. Rinse the filter as best you can.
While the filter removed, with a flash light inspect all over the sump area - looking for stuff that should not be there and clean it out. Watch out for broken glass!
Replace the filter, screws and the spray arm. Fire it up and check your results!
Good Luck!
SOURCE: Bosch dishwasher timer sticking
I have been told to replace the timer which I am looking to do the same to my machine!
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