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Either there is some error with the pump or the switching valve that switch the wahing water between the upper and the lower rotating water ejecting dishwasher arm. There is no longer water enough in the dishwasher to turn on both dishwasher arms at the same time.
Had the same problem with a ASKO DW20.3. At the moment the ASKO is disassambled to change the motor driven valve. Kind regards. Henning
the rotating arm has a magnet in it to let the controls know if it is turning. Yours is not turning so
check the jets for blockages... you might have to remove the arm to clean them properly
make sure there in nothing stopping the arm from turning...spin the arm manually to see if it rotates freely.
knives etc sticking upward can stop the arms from rotating on the top rack
if you run without the rack the arm will obviously be not telling the electronic it is not blocked because it is not there. the rack must be in the machine with the magnet and the magnet passing correct messages.
If there is really no blockage then there is a elect fault that need to be sorted professionally.
PS have you taken the arm off anf squirted a hose up the inlet to see if water comes out all of the jets????
Most likely the cause would be a blocked screen entering the pump. There is a small "shredder" spring immediately in front of it which shreds soft food waste. Many times plastic wrap gets into the unit and will block the round holes in that screen, thereby reducing water supply to the pump. Low supply means loss of pressure and that means no water to top wash arm. Access is done by removing the large white coarse filter, located behind the lower wash arm, lifting the oval plastic screen just below that and reaching in to the bottom reservoir. BE CAREFUL OF GLASS AND OTHER SHARPS! Gently clean out that area and feel for the final round screen that leads to the pump. This is the one that gets blocked with debris. Some can be "scrubbed" with an old toothbrush, but if there is plastic wrap in it, you will have to scrape it with fingernails and pick it out. Another, more time consuming way, is to remove the entire motor pump assembly and dismantle it.
Good luck. Let us know if it helped.
Could be false sensor input, could be that the arm is not turning, I am not sure how old your machine is, but age could play a part if the arm is "in fact", not turning. If you are not mechanically inclined, I would suggest that a qualified repairman check it out. Assuming that it worked ok..Prior to the several months of inactivity, it is hopefully a simple fix. Although I have repaired many a dishwasher, to give an accurate diagnosis on a machine that has not operated in some time, and without knowledge of what it was doing prior, and examining this particular problem...it is hit and miss. I would advise that you examine the wash arm, make sure that it turns freely, If you cannot find an obvious obstruction, or a glitch in its rotation...then you should have it checked out. Could be many things causing this condition...up to and including the water pressure and supply lines...Good Luck! Ihope you find this to be helpful!
The wash arm(spray arm) is not a tight fitting item,as for the noise the when spraying have a look at the spray arms the are a few holes on each side and top and bottom of each arm,you will need to remove the arms of possible they normally have a quik release system where you push two small fingers together and the arm releases,then inspect these holes and you will probebly find that some are blocked this cuases a uneven flow of water and thus makes the arm rotate un even and make a noise if you find there is food of sorts in these holes remove and put the arms back and that should take care of the increased noise.
The most likely cause is that some of the holes in the spray arm are blocked. Candy wrappers, tooth picks, seeds, nut shells or other food objects can get into the spray arm and block up the holes. If you can't get them cleaned out you may have to replace the spray arm.