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this dishwasher had many design flaws that generally cannot be fixed even with multiple service calls. lg has scrapped the design and replaced it with their "direct drive" line of dishwashers specifically to remedy the problems with stationary spray arms. my advice would be to replace the unit.
I have the same problem, well - similar. The diverter is moving for me, however it is moving to the wrong position. It seems to move between the upper arm and then blocking off, rather than upper arm and then lower arm. Did you manage to find a solution?
These spray arm will only get water several times in the wash and rinse cycle.They do not turn at the same time the lower (bottom large spray arm under the bottom rack).
There is a chamber that diverts water either to the bottom sprayer or to the top sprayers, not to both at the same time.
If your top spray arms never get water, then there must be an issue with that chamber motor to divert the water. A new sump assembly that has all the new parts.
When you say the top arm does not spin, remember that the LG model x811 family has the Vario feature that alternates between routing the pumped water to the bottom arm and then the top arms alternately. So anytime the dishwasher is washing and rinsing, either the lower or upper arms will be spinning.
If the problem is not above, then the motor that drives the check valve may have failed (or the check valve is obstructed inside.)
Hope that helps. Please post back here with what you find, OK?
The LG LDF6920 dishwasher has an innovative "Vario" motor/check valve. It switches between full power spray on the upper arms and the lower arm. So, if you are looking inside the dishwasher to see which arm is spinning, you just have not opened it when the lower arm is turning.
if the root problem is that your dishes are not getting clean with this water conserving DW, go out and buy a name brand detergent powder - like Electrosol or Cascade. And use less powder then you have been using.
I have an older dishwasher also and recently my wife also complained about it not cleaning right... so me being the man I am tried in vain to clean the things... Bought new spray arms online and installed them in minutes...now the thing works like new... However I have also found that if the heating element goes bad then that also can mess things up bad... So I would buy new spray arms, and also check out the heating element to make sure it is working... Here is a tip that will help you with the online buying... Dishwasher Spray Arms not Spinning
You've done every thing the way I would of done it but check the float switch it is located in the front of the tub near the door if this is open it wont allow power to go to the solenoid see if your getting power across this switch and let me know what you find out god luck