Having problems with your Bosch Dishwashers ?

Bosch dishwasher lower washer arm not rotating

\015 Lower arm does not rotate at all. Upper arm rotates just fine. Plenty of water in the unit. Filter assembly is clean and lower washer arm is free of any plugs or splits. How could the upper arm be rotating and the lower not? Is there some other method of water distribution between upper and lower arms besides water pressure?\015

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