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Why is my dishwasher tripping the GFI when the heater turns on, is it the thermal fuse, heater or thermostat?

This is a portable Kenmore dishwasher model 665.17822000 that keeps flipping the breaker when it starts to heat. It pumps water in and out fine. It also washes fine. Quick rinse finishes since it doesn't use the heater. the digital display seems to work fine. I have visually inspected the mother board, heater, thermostat and thermal fuse and they all look fine. I am not good at reading the ohms across the wires, but do have the manual that gives the ohms. It seems that all three parts are in stock, but I don't want to purchase all three if I don't have to.
What part do you suggest that I replace first?

Dishwashers , Kenmore , Building Supplies
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1 Answer from this member:
Joey S
First, the dishwasher should be on separate 15 or 20 amp circuits and NOT on a GFI circuit. Try running the dishwasher on a different circuit that's not protected by a Ground Fault Interrupter to see if it still trips the circuit breaker.

I added the technical data needed in the image below. The heating element should have a resistance measurement of 15-30 ohms. You will need to disconnect both wires from the heating element before you test the heater with the ohm meter for resistance. You also will need to check each heater terminal to the heating element to see if it is shorted to heater housing. The heater is likely causing the GFI to trip. You could also disconnect the heating element to see if still trips the GFI breaker too. If it does not trip, the heater is likely at fault.
by Joey S Earned 113,901 community points in Kenmore
July 28th, 2009
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