We have a new dishwasher and only the bottom arm is moving the one on top of the plates and at the very top of the unit isn't spinning, I don't think water is coming out either, so only the bottom part of the dishes is getting clean.
I had the same problem on my LG washer, Check the plastic fitting that takes the water to the top section is securely pushed into its socket at the bottom of the inside of the dishwasher. It was the problem with mine and it pops out every so often. I've thought of gluing it in but Im worried It'll prevent access for more serious repairs.
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Hello this means the circulation pump would need to be replaced. You can purchase the part from the link below. Also there are several articles that explain how to work on Bosch dishwashers.
Appliance & Refrigerator Repair
Take out the top rack and inspect the pipe nipple that the rack slides onto. Make sure that there isn't any debris stuck in it. Next pull the wash arm in question off (it just pulls off) check for debris (toothpicks are the biggest culprits and food particles (sometimes glass so be careful). You should find something in there. The wash pipe goes from the bottom to the top of the unit, if the bottom one works and the top one works then your clog HAS to be in the middle wash arm. The water clearly makes from point A to point C so C has to have an obstruction or the wash arm is sticking and not spinning freely. Try to spin it my have but really inspect it for debris. Good Luck.
Check the top spray arm holes are clear as the spray arms moves due to the pressure of water going thru them, check rinse aid is full and the setting is sufficient, check salt is full and the hardness setting is correct for your water (if req'd). Make sure the spray arm is not obstructed eg by a hanging deodiriser or the plates in the bottom basket (top basket level can be changed to accomodate larger diameter plates in the bottom). Check that the glasses being washed are d/w proof and that you are using the correct cycle.
Finally, if you have a softener unit on your mains supply and are using an all in 1 detergent or salt, over softened water can have an adverse affect on wash quality, particularly glass.
Hope this helps
There may be something plugging up the arm that sprays over the dishes. And of course, I'm sure you know not to place items like bowls, pots, etc that will block the flow of water from the bottom sprays.
Although the bottom jets do most of the working cleaning the top items, the spray from above is vital. Take the stem pipe leadin from the top to the bottom off and separate the spray arms carefully. If you can, look throgh each end to make sure no deposits are in there.
Another way is to blow compressed air from the center stem down in the water supply unit. If food particles are there you'll see them.
Check to make sure the upper wash arm is not plugged with debris. All Plates on the bottom rack and bowls on the top. Position the arm at 12 o'clock and check at the end of the cycle to see if it has moved positions.
there is a blockage but may not be obvious. arm turns only by water spraying out of the angled jets at the end of the arm. take arm off, run water thro the centre hole and this is udually enough to force the debris to the jets. clean out and check
arms should turn freely. spray arms are only rotated by water spraying out from angled jets at end. check for blockage in spray arms - sweet corn and rice are the worst offenders. take spray arms off and run water in centre hole and see it runs out of all the jets freely