1. unplugged the dishwasher from the wall ( hard reset)
2. Run hot water at the sink faucet (too make sure Hot water enters the dishwasher)
3. If HE error returns
a. Check for Broken/loose wire from control. (in the door panel)
b. Ohm the Heater element. (check for open heater)
c. Ohm the thermistor (check for out of range reading)