Dishwasher immediately trips breaker

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  #1  
Old 12-23-12, 11:50 AM
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Dishwasher immediately trips breaker

GE Profile Dishwasher PDW8480J10. Built-in, hard-wired.

After noticing the dishwasher control panel did not respond, I discovered a tripped breaker. The breaker will not reset.

I opened the kick-plate under the dishwasher and inspected where power connects. I removed the wire-nuts and tested for power to the dishwasher--none. I separated the dishwasher's b&w wires from the house-wiring, and discovered that the breaker would reset. I immediately tested for power to the dishwasher, and got power. I get continuity across the dishwasher's b&w wires. I get no continuity across black-to-ground or white-to-ground. The breaker immediately trips when I connect the dishwasher b&w wires to (hot) house-wiring., and the breaker will not reset.

Does this problem seem familiar to anyone? If so, what additional t'shooting steps should I do? or, what might the problem be?
 
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Old 12-23-12, 12:05 PM
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Welcome back after a long absence! You may have chafed a cable/wire when installing it, but that wouldn't explain why you have a non tripping situation with the wires unhooked from the DW. Concerning the wires to the DW, can you see them for their full run to the motor/control panel, or at least in the immediate area of the junction box? You shouldn't be getting continuity across b/w on the DW. If this is a new DW, it could be faulty from the factory. If checking the immediate wiring on the DW does not show any signs of chafing or grounding, then take it back.
 
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Old 12-23-12, 01:23 PM
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Initial guess is that there's a piece of bone / glass wedged in the chopper.

Newer dishwashers have a mini garbage disposal built in, called a chopper.
An immediate breaker reset, but no short, sounds like the motor is jammed.
 
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Old 12-23-12, 02:34 PM
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There will be a wiring diagram posted inside the unit. You will have to go thru and isolate items.
I doubt it's the motor and my first guess was a shorted heater element.

I don't see a mechanical timer which means this unit use an electronic control board which doesn't activate anything until door is closed and you press start. Therefore that leaves a shorted control board.
 
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Old 12-23-12, 02:58 PM
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If the dishwasher trips the breaker even when the dishwasher is off (not in a cycle) follow the hot (black) wire and see if you can find a spot where it has shorted to the metal frame.
 
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Old 02-08-13, 12:07 PM
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e'yup... shorted control board. and upon closer inspection of the board, i found a blown cap that was shorted (arc'd) to an ajacent transformer on the board when the breaker was thrown. i identified and replaced the cap, cleaned up the stinky char from the surrounding area, and "voila"... working dishwasher again.

thanks for the tip.
 
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Old 02-08-13, 03:02 PM
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Thanks for stopping by and updating us.
It's always a plus to hear of a job completed with our help.
 
 

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