I replaced the Switch flood assembly and that corrected the problem. This is a thermistor unit. I could not get any ohm reading from this.
While I had the dishwasher out I replaced the old heater. The old heater's ohm reading was 16. The new heater reading was 16. I now have a spare.
Additional info:
I also checked the high limit thermostat that is fastened to the tub. It read closed as it should. If the high limit switch is open this would indicate the relay on the main control board. Replacement of the main control board is the repair for that. If the heat relay's contact on the main control board weld closed, this will cause a "runaway" heating condition. Then the high limit thermostat would open and heater would stop heating. Hope this helps anyone that needs it.
Thanks, Nick