I have a Bosch dishwasher model SHU4302UC/U11. It makes a high pitched whining noise at seemingly random points during the cycle. It sounds like a bearing going bad. The volume of the whining noise also varies. Other than that, the dishwasher works ok. Prior work includes replacing the control unit and the detergent dispenser. What's the most likely cause of this whining noise? Thanks.

I have a Frigidaire that's now on its third pump. It's displayed similar symptoms' a whining/grinding kind of noise at various stages of the cycle. The first replace the was warranty, the second I did myself and was quite simple ($80 for the motor).

If the dishwasher is easy to access, take a look at the pump motor assembly. If it's anything like mine, it's a really simple removal; 2 bolts and a clip, unplug the power cable and wiggle the assembly out... and once it's out, if the motor is defective, it's really easy to detect the sloppy bearing in the pulley end of the shaft.