Ray T Gallaton , TN June 16, 2015 Appliance: Model WHIRLPOOL WDF530PLYB3 Whirpool dishwasher would not dry (heat) There are 4 things that have to do with the working of the heating element in this dishwasher (assuming everything else is working). 1) The heating element itself, 2) the high-temp. thermal limit switch (sometimes called the thermostat), 3) the wiring from the heating element back to the control unit in the door, and 4) the control unit. I replaced the heating element and that did not fix the drying problem. The high-temp. thermal limit thermostat checked good, with continuity at room temperature, between 0-1. I ran the wiring as best I could and it was good, so the control unit had to be the problem. I replaced that and voila, heating and drying again. I checked a difficulty of 3, below, as I had not, previously, performed this installation. The control unit in this dishwasher is lower in the door than that of most of the how-to videos. Had to remove the control panel and the skin on the front of the door and then figure out all the ways the control unit is attached to the door. Just another home fixit project. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes