Dishwasher suddenly stopped washing bottom rack. Although it is difficult to be certain, I am reasonably sure that the bottom spray arm is not spinning. It seems to me that this would indicate a lack of water pressure, yet the top rack is getting clean. We have cleaned all soap and calcified gunk out of the spray arms and the piece along the back wall of the washer. Though it was pretty gunked up, it didn't solve the problem. Any further suggestions?
After observing the water just gushing out when the spray arm was removed, we determined there was still a bunch more calcification/soap in the ends of the spray arm. (We have very hard water in our area). Unfortunately, you cannot open up the spray arms to clean them out, so it took about 30 minutes of pounding and manipulating to get all the gunk out. Now my dishes are clean again. Hallelujeh! And the water cleaning the dishes is cleaner, as well.
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Make sure top rack is backed up into water entry in back of diswasher. Also check to make sure holes are not plugged in rotating wash arm. You may have to wash your dishwasher..take out the racks and look to see if they have food gunked up on them, if so wash them off in the sink. Take out the top rack clips and wash the rails inside the tub if they are dirty. You can use a squirt bottle with warm water. Do this after you run a rinse cycle so that dried food gunk is softer. There are alot of places in this machine for food to stick then resurface later. you may try also adding vinegar and baking soda to a rinse cycle and then leaving in it soak before restarting it.
Position the spray arms in a certain position. Activate the dishwasher for a few seconds and then examine the position of the spray arms. If the upper spray arm has not moved, then either there is no water coming to the spray arm or the spray arm is clogged.
In my experience, you probably have a clog in the spray arm/arms for the top rack. Take the arm(s) out and see if the holes in them are clogged. Rice, plastic wrappers, and glass from dishes that broke in there are the most common culprits I've seen.
Make certain you do not use dish soap when rinsing the dishes. Make sure you only use DISHWASHER soap when running the DW. In fact,there is no need to rinse dishes. Remove visible scraps and put them in the DW. If it is a quality DW it will clean your dishes. Do not crowd the dishes in the DW. Most JennAir DW's are quality. Make sure the top rack can get washing action from the bottom spray arm. No pots or other water stopping utensils on the bottom rack.
The top rack is not cleaning because of low water pressure from the wash motor to the upper spray arm. Assuming the top spray arms are clear of debris, remove the lower spray arm to access the wash motor. Remove the 4 torx screws and the filter (accumulator assembly). Remove the torx screw and the inlet protector that covers the chopper assembly. Make sure the chopper is not broken (broken chopper will fill with debris and block water flow). While holding the chopper blade, reach inside the "D" shaped opening on top of the motor and spin the wheel/motor by hand in each direction to make sure either the chopper gear or the motor gear that drives the chopper is not broken. Replace the chopper if necessary . If the motor gear is broken, replace the sump and motor assembly . Remove any debris from the sump area in the process. You don't have to shut the power off to the dishwasher because the door will be open, but if you feel more comfortable, do so.
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.
It is important to know that the upscale LG diswashers alternate between washing the top and bottom rack. So it is normal for some arm to not be turning at certain times.
Also, if this dishwasher is set to half load, bottom only, the top arm will never turn.
I have a Bosch dishwasher with the same "mystery" part. According to my manual,this part is an Extra Tall Item Sprinkler (select models). Apparently, if you are loading in extra tall items, you take out the top rack and insert this part into the top rack spray outlet (located a the back of the dishwasher). Turn it clockwise to lock it into position. Put your extra tall items in the bottom rack. Hope this helps!