You have a high-limit thermostat in-between your heating element and control board, You'll need to ohm that hi-limit thermostat with a
multimeter to test for continuity, should read 0 ohms.
The high-limit thermostat is underneath your tub, just take the front lower access panel off and get a flashlight or drop-light and you will see it.
Turn the breaker off to your dishwasher before you ohm test it.
Here it is for your model:
154642901 Thermostat
This video shows you how to ohm test it:
Dishwasher not working or not turning on? This video demonstrates how to test a fuse on a dishwasher. Learn more from the experts at Repair Clinic.
www.anrdoezrs.net
Let us know what you find.
Jake