Charles H Littleton , NC September 27, 2015 Appliance: Whirlpool Undercounter Dishwasher GU1200XTKT0 Whirlpool Dishwasher Gu1200xtkt0: Dishwasher not cleaning dishes. How to replace Upper Rinse Arm Spinner. Replaced food grinder and heating element. Screen in food grinder was more than 50% blocked due to broken grinder. Heating element was not working after something had fallen and melted onto it, breaking ceramic coating. Videos were very helpful. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes