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- > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > GE GSD6200G00BB water valve always open (always)

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GE GSD6200G00BB water valve always open (always)  Rating:  Rating
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 Posted: Thu Sep 20th, 2007 01:25 am
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Dominic
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GSD6200G00BB dishwasher. Trips 20A breaker when cycle starts. Track problem down to water valve circuit (pink wire out of control board, yes I have wiring diagram). Disconnect harness from water valve, still trips breaker. Disconnect harness from float switch, doesn't trip breaker.

Remove float switch micro. Middle pin definitely has some melting, presumably from the several dozen times I've tripped the breaker during diagnosis. Put multi across the two pins that the float switch harness goes to, have connectivity. Push the float level down, no change. (Shouldn't there be connectivity anyway when the float switch is down?). So even though the float switch is faulty, it doesn't seem to be the problem…

Figure it can't hurt to get replacement float switch. ($32, ouch). Install, think my job is done. Guess again. Breaker doesn't trip, but water valve doesn't turn on now.

Test for voltage. Getting 110V to harness that goes onto float switch. Getting 0V at harness that goes to water valve solenoid. Water valve solenoid shows connectivity (I didn't check resistance).

Remove float switch micro. Apparently the new float switch is defective, because the metal level has no tension in it, and there is no connectivity in either the up or down position. What the?!?

Jumper the float switch harness to get 110V to the water valve (damn the float switch, full speed head!). Turn on cycle, breaker trips. (Oof. Blow to stomach.) :yikes:

Read Samarai forum. There is mention of a transient absorber ("transorb") wired to the leaad coming from the float switch and going to the water valve harness. This is to "absorb electrical transients created when the water valve is turned off." Figure it can't be that important. (Ha!). See http://applianceguru.com/forum1/9914.html

Remove transorb and put wire nuts on both exposed wires.

Put jumper back in float valve harness, replace water valve harness onto water valve. Turn on water pump using service mode (entered by holding "pots and pans" and "heated dry" simultaneously for 3 secs.). Breaker does not trip, water flows into tub. Hooray! :D

Not so fast. Water valve will not shut off even after service mode exited! Start regular cycle, water continues to flow, circulation pump turns on, water valve keeps filling, and filling…. (Remember, float valve is bypassed.) :X

I could put the float valve (a working one) back in, but the water valve is just constantly on. It is not stuck open. It is getting voltage. I disconnected the lead going to it and it shut off. There is clearly some kind of control problem.

Did my good idea of removing the transorb fry something in the control panel? I don't want to spend $80 without somehow verifying this.

Any ideas?

Last edited on Thu Sep 20th, 2007 01:29 am by Dominic

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 Posted: Thu Sep 20th, 2007 01:31 am
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Pegi
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Probably when that transorb blew it damaged the control board, the dishwasher is time fill, the float swith is really a flood switch in case you have high water pressure...most likely need to replace that transorb and the control board....



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 Posted: Thu Sep 20th, 2007 01:36 am
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Dominic
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Thanks for your reply Pegi.

Funny thing is, before I took the transorb out I checked the voltage going to the float switch harness several times with cycle on and cycle off. At that point I was getting voltage to that point only when the cycle was on.

So it appears I did something (i.e. damaged the board) only after I removed the transorb. What exactly does this part do, and is it really that necessary to operation?

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 Posted: Thu Sep 20th, 2007 01:13 pm
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Pegi
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That transorb is supposed to keep electrical crap from damaging the control board when the fill valve shuts off, but when that trransorb shorts out it takes out the fill valve and the float switch, the bulletin says to replace all plus the control board I believe since it most likely damaged the board also....nice design huh??



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 Posted: Thu Oct 18th, 2007 07:17 pm
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Dominic
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Transorb finally arrived Tuesday. I had already had the new controller and flood switch. All installed, dishwasher working. I have clean dishes!!!

See my rant on GE: http://applianceguru.com/forum11/14362.html

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