Have you cleaned the dishwasher?  

Extremely hard water mineral deposits can cause damage to your dishwasher and make it difficult to achieve good cleaning. A water softener is strongly recommended if your hardness is 15 grains or more.  This residue builds up on internal components (such as the spray arms) as well as your dishes, and dishwasher interior. Use of a dishwasher cleaning product such as affresh^® Dishwasher Cleaner can help to remove the residue. Monthly use of affresh^® Dishwasher Cleaner is recommended to help maintain the dishwasher. 

CLICK HERE for additional information on cleaning 

affresh^® cleaners are available at many retailers. Find one here.

Was the dishwasher correctly loaded?

If the dishwasher was not properly loaded, it could cause the spray arms not to work correctly.  Check to make sure items are not blocking and/or preventing the spray arms from turning. If taller items (placed in the bottom rack) are preventing the spray arms from turning, the top rack may need to be adjusted.  

To test: After loading the dishwasher, gently turn the spray arm.  If the spray arm does not freely turn the dishwasher may need to be reloaded. 

CLICK HERE for additional information on proper loading

CLICK HERE to watch  video on how the spray arms work