David M Clancy , MT June 08, 2023 Appliance: Whirlpool Dishwasher WDT720PADM2 Whirlpool Dishwasher Wdt720padm2: Not draining properly. At the end of the cycle there would be a decent amount of water at the bottom. The drain function wasn't working well then stopped working all together. How to replace Check Valve. Replaced the drain pump and test-ran it. Drains normal again. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes