Lower and upper spray arm will not turn

Remove the upper wash arm from the rack. Examine thoroughly. Look for hair line cracks especially if the wash arm is plastic. Top rack wash arms have spray holes on the top AND bottom. Check both places. Sometimes small fish bones will clog the hallway of wash arm not just the holes. After years of use, the wash arm will bow especially plastic ones. Be sure the water connection to wash arm is Secure. If you think the wash arm is not spinning, try this. Place a old cell phone inside a sealed glass jar and start recording video from the lower rack. Be sure jar is Secure. The light from phone will come on. You might see the problem this way.

It could be a motor or a pump issue. The dishwasher has a motor that attached to a pump which forces the water up into the sprayer arms and during the drain cycle, it pushes the water out of the dishwasher.
The motor (and pump) located beneath the dishwasher.
Check if motor spins. In case it spins, the problem is with the pump ,in case it doesn't spin it could be a motor problem or a motor and pump problem.

First of all: filter plate clean? Clean any locked hole.
1) Can you remove the upper spray-arm and verify if holes inside are locked by any residus. Clean the holes , and check if pure water come out when you fill the center hole with some water.
2) Switch on the dishwasher , coldest wash cycle dish-washer empty and without the upper spraying arm. Once you hear water streaming in, open the door and look if a little water fountain comes out from the center hole where the upper spraying arm was fixed. If not, this canalisation is blocked and should be cleaned. Try to continue the wash cycle, often the water pressure will clean itself this canal. Check also lower spray arm: it should be rotating a while and ejecting water thru its holes. If not, verify this canalisation as well.

3) Put the spraying arm again on its place, verify also the sealing else water pressure is going down and spraying will not turn and spray water.

4) Again, continu a wash cycle, open the door and look; upper arm should be rotating and some rays trown out.

Hopefully, this helps .

If not, pump pressure may be low; have a repair verify, can be that only brushes in the motor must be replaced, can be the pump worn out and to be replaced at all.

Do you have a print manual for this unit?

If there is no blockage, your pump may need to be rebuilt or replaced. If your machine uses a solenoid valve to control weather the pump is washing or draining. The drain valve may be stuck somewhat open, diverting wash water down the drain. Or the wash valve may be not opening fully. Different machines work in different ways.

There's aspray arm at the bottom of your dishwasher--it may have a tall spray tubemounted to the center of it. There may also be a spray arm located directlybeneath the upper rack of dishes and/or above the upper rack. If debris is blocking the holes inthe spray arms where the water comes out, it could cause cleaning problems.Regularly inspect each of the spray arms and clean out the holes as necessary.

Check to see that both upper and lower arms are working. You can do this by suddenly opening the diswasher about 6 in and observing if the wand arm on top is revolving. This is done by water from the lower arm being pumped up through a tube mounted in the lower basket that centers over the lower arm and upper arm. Check that the tube is clear. check that water from the lower arm center is being pumped. Check that the hole is clear. if you have hard water, then sometimes the holes get clogged up and the arm will not rotate.(just like a lawn sprinkler) The upper arm rotating is what washes the detergent out of the soap dispenser. To aid in cleaning the spray holes, pour some white vinegar in the bottom of the machine about two cups, and turn the machine on high temp wash. Do not let the mixture drain out untill you have cycled it about five times. When the wash cycle has about finished stop and restart. The acid in the vinegar will help disolve the calcium and hardened soap. After the finish rinse cycle, you can put a little lemon juice in the machine and let it was through, that way the vinegry smell will disapate.

Clean the spray arm jet holes if they are blocked. Check whether you have filled the rinse-aid dispenser.

Check whether arm turns freely when rotated by hand manually.

On the LG LDF xxxx dishwasher family, the Vario feature uses a motor/check valve to switch between "full power" cleaning from _either_ the lower or the upper spray arms, never at the same time. So, not seeing the upper arm spin during the lower arm spinning is standard operating procedure.

But back to your problem. Step one would be to remove the filter assembly again and make certain that there is nothing (debris, broken glass) blocking the white areas where the check valve rotates to switch between upper/lower spray arms. A blockage there ~could~ cause impotent spraying/cleaning.

If there is no blockage and the impeller remains in good shape, suspect a failing wash pump motor. Try to isolate the noise to that motor.

Watch for error codes on the display and report back what you find, OK?

Good Luck!

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. otherwise....

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 spray arm.

Remove each arm and inspect the small spray holes for plugging. Use a vacuum in the center hole and poke out each plugged hole. Unless your vacuum allows wet pick-up, make sure the arm is dry first. Try using a capsule type of detergent instead of liquid. You might have to tear down the lower spray arm assembly to the deck to clean the large screen which may be plugged with water/food deposits. Use hot water, detergent and white vinegar to clean the screen. Hope this helps!