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The most likely cause is a blocked or clogged wash arm. Many times when the wash stops the debris blocking the spray will back away. The holes in the arm are aimed to cause the arm to rotate. The clogged hole is usually an outer diameter hole which provides the force for the arm to rotate.
Some upper end washers have a blocked arm sense to alert when arm is blocked.
Careful not to deform the geometry of the hole when removing the debris. Tweezers work the best.
The first thing to check is whether the spray arms are clogged up. Small, hard food particles such as pepper seeds can block the holes. Some spray arms can be removed very easily for cleaning. Our old Kenmore spray arm needed a star-shaped bit. Check the overhead spray arm as well as the ones under the racks. You might also try running Lime-Away through if the inside looks clogged up with calcium deposits.
In our old Kenmore, we had food residue on the top rack when the grinder blade was chipped, broken or obstructed by an olive pit, a date pit or a cherry stone. Don't know why the top was worse than the bottom. A new one cost about $25 at that time and was not to hard to replace, but it is a poor design, since it is nearly impossible to keep such things out of the dishwasher. We replaced the grinder three times in 5 years.
Even though modern dishwashers brag that you don't have to rinse first, it is helpful to knock off seeds and pits that can cause trouble. To save water, have a small vessel of water--perhaps a pan you are soaking--and use a brush to quickly swipe each plate or bowl before loading.
As you have already cleaned and checked the arm for any
clogs then please make sure that all holes are open. Use a sharp metal pin to
clean the holes on the top spray arm. Make sure the water pressure is not low. The
top arm spins freely. If not then check the bearings for the arm. Hope
this helps...please post back for further assistance.
top spray arm will be blocked with sediment/food deposits etc remove clean thoroughly with hot soap water and shake/tap it on side of sink to dislodge deposits if the outermost holes are blocked the arm will not turn and you will get poor wash results.
Check the spray arm opening/holes for clogging with debris. If clogged, remove the debris from the holes. Then position the spray arm in a certain position and operate the dishwasher for a minute and stop and check the position of the spray arm. If in the same position, then the arm may not be receiving water from the water pump and/or upper water inlet housing/tubing. Contact an appliance service company.
Ensure that the spray arm is movable. Inspect the spray holes in the top spray arm. If clogged, clean the openings. If no clog, position the spray arm in a certain position (e.g.: arms facing front and back). Then activate the dishwasher for a minute or so and open the door to determine if the spray arm has moved. If not, there may be an issue with the water feeding to the spray arm (typically via the water pump, etc.).
Many times the washing arms of the bosch and few other models will clog up with old soap or debris.
Try removing arms and clean out any debris by blowing air through unit and if need be a toothpick or dental tool to remove any solid debris that is stuck. Reattach arms and run through cycle. Hopefully this works otherwise it could very well be the pump.
There is a screen that you can remove from the sump of the dishwasher to clean. Just twist it to the left and pull it out. I have some tips that you might want to check out if this does not resolve your problem. <a href="http://tclaundryrepair.com/">St Paul Appliance Repair</a>
only the top rack isnt getting clean? there is a little plastic
circle in the middle of the bottom of the upper spray arm. turn it
counter clock wise to pull the upper spray arm from the upper rack.
make sure that isnt clogged and the spray holes are not clogged.
the piece that the bottem spray arm plugs into and
runs along the back wall of the tank to the top is called a feed tube.
pull the bottom spray arm out. now you can see the part of the feed
tube that feeds the upper spray arm water. does it pop out freely and
easily? if so then you need a new feed tube, if not then its most
likely your not achieving the right water level or your impeller
connected to your circulation pump(motor) is clogged not supplying
enough water pressure to travel up the feed tube to spin the upper
Normally when you have low water pressure and/or cleaning issues, this an indication of a clog in your main wash pump. You will need to remove the lower spray arm and the coarse screen to get to the main wash pump sump. Inspect the impeller area of the pump. This area is usually where accumulations of debris collect and keep the pump from pulling enough water. Things like orange seeds, lemon seeds, bottle cap liners, chicken bones, and jar labels are just a few of the items I have personally found. Although, dishwashers do a good job at removing most food particles, they are not garbage disposals. I bet you will find a clog in the sump somewhere. Let me know if this helps.