The bottom wash arm will not spin when the dishwasher is in use. It doesn't catch on anything and will spin around by hand. There is no blockage and the top arm works fine. It has got me totally baffled.
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Re: bottom wash arm
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
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Is water flowing, ie pump activated. if you can remove the arms, check the seals are clean. Check to see if the arm is hitting anything by spinning by hand before cycle. Also remove arm and check to see if nozzles are blocked, sometimes you cant see the blockage as the blockage is further inside the arm. Use tweezers to remove anything. Bottom arm could be inhibited by missing roller on rack also
If the sprayer arms continues to get caught, see if your racks can be adjusted in height. Some can be moved up or down by the side brackets. Otherwise freely spin it with the unit off and see if it is just getting caught on a pot/pan in the unit. Otherwise, it may not be getting enough water pressure to turn it completely around.
It will spin freely by hand, but needs to spray water out of the jets at the trailing edge of the arm. Check inside the arm for blockage and make sure that water is getting to the upper arm from the pump.
Does the arm rotate if you turn it by hand? If it does. and the top arm rotation is normal, there must be a blockage further back in the piping. Remove the arm, it us usually held in place by a nut or a clip, and check the hole, even try operate it without the arm so see if it will dislodge anything. Also check the inside of the arm again, there may be something there that you did not see earlier.
Remove the dishwasher from the cabinet and look at the hose going up to the top. Make sure it isn't clogged and that there is nothing in the port where it comes out of the pump. The top arm is powered by water pressure from the pump.
Yes, the wash arm should spin freely. Recommend that you remove the arms and search for what is stopping it.
In addition to hard water, the ultra-cheapdishwasher powder really does/can leave calcium-like deposits behind. Use brand name powder for 30 days and you will see a difference. Never use gel or tablets in any dishwasher.
Adding a whole-house water softener would eliminate 90 % of your problem. The other 10% will be taken care of by not buying ultra generic powder.
If your dishes are getting clean, then your problem is a "feture" not a failure. The LG LDS5811 has a Verio motor/check valve that switches between cleaning the upper dishes and then the lower. Depending on when you open the door, one arm will not be spinning.
All the presure is routed either to the lower or upper arm, so it really does help - especially with a water conserving model like the 5811.
I may have the answer. I had what sounded to be the same problem. I found the dishes were dirty after they were cleaned, but I found there may have been a big pot lid blocking the upper arm. I decided to run the machine again, and after a bit opened the dishwasher after to make sure it was not a problem with the arm. Sure enough, the arm wasn't moving. However, I found out on the Frigidaire webpage that some models have an alternating spray cycle, where only one arm spins at any given time. After reading this I checked again, and it had moved by that time. I checked a few times more to confirm this. So it ended up it was an arm blockage after all. Hope this helped...good luck. www.frigidaire.com/support/FAQ-Dishwasher.asp#6
check the water level in machine this may be low due to pressure switch not sensing correct level try blowing back through air tube to clear any water from tube then try again
quick way is to start machine and when in wash mode check water and position of arms then add a litre or so of water in mid wash then recheck wash arms if they are now moving then you have water level problem