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Circuit board for problem dishwasher

 
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Newbie



Joined: 04 Apr 2011
Posts: 3

PostPosted: Mon Apr 04, 2011 2:29 pm    Post subject: Circuit board for problem dishwasher Reply with quote

Hello I have this simple circuit board from a dishwasher and I was wondering if anyone here can point me in the right direction as to what component can be at fault.
The problem is when the machine starts it's first cycle...adding water, it fills then starts the washing but then it starts to turn the water on and off many many times in short bursts causing my pipes to pound loudly.
I checked the voltage going to the valve and saw it was fluctuating between 9v to 0v causing the valve to open and close erratically. This leads to the circuit board causing the problem.
So the pink wire in the photo powers the water solenoid that opens and closes it. Any ideas? Here are the photos.
Thanks

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tj



Joined: 24 Oct 2005
Posts: 9
Location: Denmark

PostPosted: Mon Apr 04, 2011 3:21 pm    Post subject: Reply with quote

When I have had this type of problems with dishwasher/washingmachine, it has always been the sensors that monitors the level of the water. It can be clogged by waterlime or dirt.
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Newbie



Joined: 04 Apr 2011
Posts: 3

PostPosted: Mon Apr 04, 2011 6:12 pm    Post subject: Reply with quote

Hmm, I did suspect that and had a quick look at it, it seemed to be switching on and off but I didn't test when problem was occurring. I will do a live test and look for dirt etc. tonight. Will update later.
Thanks
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Newbie



Joined: 04 Apr 2011
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PostPosted: Wed Apr 06, 2011 6:50 pm    Post subject: Reply with quote

Well it's not that switch because the water doesn't even get high enough to activate the switch.
So it's back to the circuit board, maybe it's timing the water flow and not adding enough, and when it registers that there is not enough it continually tries to add more. The water is free flowing as fast as it can through a quarter inch pipe used!
I tried to order another circuit board but the no longer stock them!
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achmadmualip



Joined: 18 Apr 2011
Posts: 2
Location: indonesia

PostPosted: Mon Apr 18, 2011 10:14 pm    Post subject: Reply with quote

Thank's
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PostPosted: Fri May 06, 2011 3:38 am    Post subject: Reply with quote

I would be checking for poor solder joints (dry joints) on components switching the solenoid.
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sj
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PostPosted: Fri May 13, 2011 3:31 am    Post subject: dishwasher Reply with quote

first fault to occur would be mechanical sensors exposed to harsher environment than your pcb. Is it triggered by the cycle or the amount of time it's on and heats up. Time this: Turn off when ruckess occur by opening the door. Let cool a couple hours then restart. Find out if the is a correlation between time on or a particular activity going on inside (different solenoids and sensors activated at various times).
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