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Empty the dishwasher. Look at the 2 rotating plastic arms in it (like 2 bladed windmills) spin each one, do they move freely without hitting anything? If so remove the top one (its a press on fit) the look inside it with a torch, is there any debris or dirt inside it blocking it? Water has to flow inside it or it will not spin, and top rack gets no water spray.
use any brand of dishwasher cleaner from a local store and run your dishwasher with it.I would also recommend that a calcium lime and scale remover be ran through your dishwasher to clean it out.
this may have to be done a couple of times.
I find it odd that the dishwasher is filling with cold water if the water is hot at the sink. It sounds like the dishwasher is connected to the cold water line rather than the hot. Check under your sink; if you've got standard plumbing, the dishwasher supply line should be connected to the left water pipe.
Regardless, the water temperature doesn't fully explain the symptoms, especially the detergent left in the door (assuming you're using fresh detergent and it's not caking in the door prior to washing).
I would check the blades again. Even thought they may appear clean, there may be debris in them that get forced into the openings during operation, but fall away from the openings when the water flow stops. Remove the blades, run water into them, then invert them to drain while rocking back and forth. If there's crud in them, you may need to do this several times.
Make sure you get water to the dishwasher. Check to see if the water
shut-off valve (located under the sink) is open. If you get water to
the dishwasher, but there is still no water inside during the fill
cycle, the problem might be with a faulty water valve (located at
the bottom of the dishwasher, behind the kick panel, on either
side), in which case replace the water valve.
If there is not enough water, the dishes would not get cleaned. This
could be caused by a partially closed water shut-off valve (located
under the sink), or a faulty dishwasher water valve (located at the
bottom of the dishwasher, behind the kick panel, on either side).
There is usually two, sometimes three spray arms in a dishwasher.
Make sure there is no debris blocking the holes inside each spray
arm.
The problem is likely that the cutter/chopper filter is plugged. This reduces or eliminates water flow to the cleaning arms. Solution: Remove dish baskets Remove bottom arm - Rotate the centre post until arm is free to be lifted out. Remove conduit to top arm(s) - Remove 2 screws, one at top and one at back. Rotate whole conduit 45 deg right and lift off of centre post. Remove bottom plastic assembly. - Remove 4 screws and lift off. Remove cutter cap. - Remove 1 screw at front left. Lift off plastic cap. Remove cutter filter. It is on a spring loaded pin. Pull cutter blade foreword and lift filter disc straight up. Clean filter disc thoroughly Reassemble!
One of 2 things is wrong. Either the direction solenoid has failed is not cycling the water between the upper and lower wash blades or the control board that controls it has failed. You will need a qualified LG technician to diagnose and repair the problem.
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