Hi @ali15597
You need to check all the components in the heater circuit path to make sure that they're OK e.g. wiring connections, hi limit thermostat, thermistors etc.
Here's the [document|29000|tech sheet] for the dishwasher that may help. Go to p.4 to view the ''Water Heating/Heat Dry and Water Sensing with O.W.I. Sensor (Water/Air/Soil/Temperature)'' strip circuit.
''***Be safety aware***,'' ''disconnect the power to the dishwasher and check as much as you can with an Ohmmeter first as the heater circuit operates at 120V AC''