DIAGNOSIS Heated Dry on these models relies on a heating element at the bottom of the tub and a specific venting cycle. If dishes are wet, the element might have failed, or more commonly, the cycle was interrupted or the rinse aid is empty.
FIX First, confirm you're using a cycle that includes heated dry (like Normal or Heavy). The Sani Rinse option alone doesn't include a dry phase. Second, check your rinse aid dispenser. If it's empty, water will bead up on dishes instead of sheeting off, making drying ineffective. Fill it and set the dial to at least 3 or 4. Third, don't interrupt the cycle at the end. The dry phase happens after the final rinse, and if you open the door prematurely, you let all the hot, moist air out.
IF THAT DIDN'T WORK The heating element could be faulty. After a complete cycle, carefully feel the very bottom of the tub interior (wait for it to cool slightly). It should be warm to the touch. If it's stone cold, the element or its connections might be the issue, which requires a service call.
HEADS UP Plastic items will never dry as well as glass or ceramic, even with perfect settings. That's normal. For better plastic drying, use the Top Rack Only cycle if you have a load of mostly plastic.