Not cleaning dishes

Hello
The drain hose does not have a one way check valve in it. I would look at the spray arm and pump screen. There is a claerd door you can purchase for Whirlpool products to let you see what is happening in side the dishwasher when it is running. We use this alot to diagnose problems, its much easier when you can see the operation. See video link below.

Hello
A few things you need to check for :
1) Make sure the customer is using the correct detergent and not using too much detergent.
2) Make sure the unit is filling properly with enough water, low water pressure will cause this issue.
3) 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. If a water softener is not installed, the following steps may help:
Use a commercial cleaner designed for dishwashers once per month. Clean the upper and lower filters at least once per month.
4) Always use a rinse aid.Always use a high-quality, fresh detergent. Use a detergent booster/water softener additive designed for dishwashers. Be sure the dishwasher is loaded correctly. Improper loading can greatly decrease the washing performance.
5) Be sure the incoming water temperature is at least 120°F (49°C). Use the proper amount of fresh detergent. More detergent is needed for heavier-soiled loads and hard water conditions. Make sure the customer is Scraping food from dishes prior to loading.
6) Check you pump screen to make sure it is not plugged with food.

Matt Ace technician