Now we have had this dishwasher, since I spent all of Christmas day installing it back in 2002, for over 7 years without any problems. I'm actually a fan of a good buzz now and than but the noise the "Silent Partner III" model GU1500 was make quickly became unacceptable.
My first thought was that something had gotten loose, maybe the twirly thing in the middle that sprays the water around. I took out the bottom rack and - yes it seemed loose. I love an easy fix so I tightened the little grey screw and optimistically told my wife - "Honey, I think I fixed it." I bathed in the Mr. Fixit glow till the "Silent Partner III" was turned on to do the next wash - BUZZZZZZZZZZZ! - bummer.
We suffered the noise till the weekend. It was a lovely Sunday late morning and I knew something had to be done. I took out the bottom rack again and poked around, pushing and pulling this and that, hoping I'd get lucky. Put the rack back in, test, buzzz, bummer.
I didn't feel like taking the "Silent Partner III" apart and decided to take the easy way out - call 1-800-253-1301. This could have worked out well - I would order a service call and relax with and sense of accomplishment and a beer.
Thing is I really hate phone trees, especially the ones that try to have a conversation. After a few minutes of "can you repeat that", "I'm sorry but I didn't get that" - I gave up with an angry little buzz spoiling the waning hours of the weekend.
OK, I will have to deal with it. From the Gu1500 manual I found out "if hard items enter the mash module, you may hear chopping, grinding or buzzing sounds" -lets take apart the wash module.
All you need is a screwdriver with these funky bits - I'm sure they have names - one is square and the other is a 6 point star. I had them because they came with some set of tools I got as a gift for some occasion I don't recall now.
First you have to pull out the bottom rack - that's easy - you just pull it out. Next is the top rack. It's held in by these little white, plastic clips at the end of each rail. You have to press on the top of the clip to get it out of the top opening. When you are ready to lock the top rack back in, they just snap into place and it auto-locks. The upper spray arm comes out with the top rack so you don't have to worry about that.
Now we have free access to the whole wash module. First lets take out the lower spray arm. It's connected with a little plastic, grey screw dohicky. You have to unscrew it holding on to the arm and than align a slot in the lower arm and pull it up. It's easy but if you don't know about the slot you can get frustrated yanking on the damned thing - not that I did anything like that.
Now you have to undo the water tube. It's connected by 2 screws and a snap-in lock at the bottom. Using the square bit unscrew the 2 screws and twist the whole unit to the right. On the bottom the water tube is still connected to the bottom wash module cover. Unlock the plastic snap-in lock and pull out the water tube. Now you can twist the wash module cover all the way to the right and pull it off. Take out the grey screw dohicky that holds in the bottom spray arm.
Now we can take out the white unit cover by undoing the 4 screws with the star shaped bit - if somebody know what these are called please let me know. This cover fits tightly over the unit, at least in my case, so it needs a sharp pull to come out. Ahh now we can examine the grinder intake where the hard items can be stuck. Low and behold - we have hard items. I think the piece of glass, part of a martini glass stem, might be the real culprit with contributing effort from the pits and a guest performance from the little plastic nib. There was another mushy stemy thing, kind of hanging on to the input, that I couldn't pull out so I just shoved it all the way in.
I figure that should do it. First I gave the, now exposed, hidden places a little scrub. I was pleasantly surprised how little grime accumulated after over 7 years of almost daily use. The worst was on the top rail locks and behind the water tube.
I traced my steps back and put the pieces back in. Most importantly DO NOT OVER TORQUE THE SCREWS. Remember this is plastic so just use enough force to tighten and hold in place.
First the bottom cover with the 4 screws. Than the grey dohicky. Now the white washer module cover snaps in to the slots and gets twisted to the left - just enough to let the water tube snap on. Now twist the whole unit to the left so that the water tube aligns with the screw holes. Screw the water tube in place. Put the bottom spray arm in place, align the slot and tighten with the grey dohicky. Slide in the top rack and lock it in place with the little, white, plastic clips. Slide in the bottom rack. Test.
After the applause die down you can bask in the Mr. Fixit glow, have a beer and create your own personal buzz.
By the way if you haven't noticed by now - I am not a professional - so this is not professional advice. If this doesn't work for you or if you break something while trying to follow this - it's not my fault. The safest thing to do if your Whirlpool, Silent Partner, GU1500 dishwasher is making a buzzing noise is to call 1-800-253-1301 and brave the phone tree.