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husker-v  
#1 Posted : Wednesday, December 8, 2010 7:51:36 PM(UTC)
husker-v

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Last week I decide to replace my soap dispensor because the latch was failing. I did so, but as I put everything back together I pinched one of the wires leading to dispensor under a screw. When I pressed start on the dishwasher I heard a pop because this short had grounded out. I fixed the wire, but now the washing pump will not energize. The dishwasher control panel appears normal. The drain pump, water inlet, heat etc. work fine, but the motor will not engage. Is it the motor, capacitor, circuit board???? This unit has worked fine, but is 4-years old. Debating about fixing or replacing. Any assistance will be greatly appreciated! Forgot to mention that the short was severe enough to flip my circuit breaker in the basement.
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denman  
#2 Posted : Thursday, December 9, 2010 1:52:18 AM(UTC)
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Unforetunately it sounds like you blew the control board.
If the unit is a plastic tub then the motor and the heater run through one of the door switches and I would have suspected that switch blew out but you said that the heater is OK so that switch will be OK.

All you can do is check the wiring to the motor.
Also check the control board for burned components.

If you have some experience with electricity you could disconnect the motor and then connect a line cord to it. If it then runs and it's wiring is OK, all that is left is the control board.
Note: Care must be taken that the line cord wires cannot short to each other and that you do not get a shock.
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husker-v  
#3 Posted : Thursday, December 9, 2010 8:35:33 AM(UTC)
husker-v

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This unit has a stainless steel tub. I didn't notice any burn marks on the visible side of the circuit board (the one immediately behind the start/cancel buttons). I thought maybe I had blow the capacitor. Would there be visible signs of that problem. So far all components and wiring look very good.

So you think it could be the control board even thought the drain, heat, inlet functions are all still working fine? I hear various clicks, etc. but never washing action.
denman  
#4 Posted : Thursday, December 9, 2010 12:49:49 PM(UTC)
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[COLOR="Blue"] I thought maybe I had blow the capacitor. Would there be visible signs of that problem. So far all components and wiring look very good.[/COLOR]
You could disconnect the motor and check if there is 120 volts there when the motor should be running. If not then the board is not putting out the required voltage.
I would have thought if the capacitor was blown you would still get a hum out of the motor.
Most capacitors fail internally without any external indication of failure.

[COLOR="Blue"]So you think it could be the control board even thought the drain, heat, inlet functions are all still working fine? I hear various clicks, etc. but never washing action.[/COLOR]
It is hard to tell what is clicking.
I think what probably blew was the IC/transistor that closes the relay which gives power to the motor.
Could be that the relay contacts blew but they should not have been is circuit so I am leaning towards the IC.
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husker-v  
#5 Posted : Thursday, December 9, 2010 1:14:53 PM(UTC)
husker-v

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The IC would be on the control board....correct?
denman  
#6 Posted : Thursday, December 9, 2010 1:40:58 PM(UTC)
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Yes it would be on the board.
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