<<<I am sure there are plenty of updates on that model which is very dependent on the serial number.>>>
<<<However, grinding noise during wash cycle coupled with an LE, sump WILL need replaced.>>>
While it is entirely possible that the SUMP ASSY is at fault---it's not likely.
All LDS4821 dishwashers had the revised/corrected SUMP ASSY.
The original dishwashers (5800s/6800s/7800s etc) had the *flawed* SUMP ASSY.
Original/flawed SUMP ASSY: 6871DD1002B (in most cases)
Revised/corrected SUMP ASSY: AJH31248604
(last of the AJH series)
It's doubtful that Anita Marcoff is still researching possible solutions for her dishwasher (first & last post was July 07).
The most likely cause of Anita's dishwasher failure---is from an obstruction in the WASH MOTOR impeller.
LG re-designed the FILTER HOUSING (ADQ32598202
)---which better prevents hard debris---such as shards of glass or a toothpick---from entering the filter housing.
The typical complaint that an owner will give is...
"The dishwasher made a grinding/growling/chirping noise and then threw an "LE" error."
"Prior to that fault---the dishwasher never really functioned adequately---even when new".
"Now it does not work at all".
It is necessary to remove the Filter Housing and discard.
Inspect and clean the Wash Impeller area.
Add a new CHOPPER (5832DD4001B
)---also known as a Macerator. The CHOPPER used in all LDS4821 dishwashers---had an *arrowhead-type tip*---which is different than the original used in earlier LG dishwashers.
The CHOPPER with the pointed tips/ends---will cause "whistling/grinding/whine" noise---but this does *not* in and of itself cause functional or performance issues.
I've had customers call me and request service on their LG 4821 dishwasher.
The symptom that was described over the phone was something like this...
"My LG dishwasher---which I've never been too happy with---stopped working and is showing an error of---I think--"LE".
After arriving an examining the dishwasher---I had found that the error was in fact "1E" (the customer misread it).
On the LG dishwasher model LDS4821---built from September 2010 through January 2011---there was a defect in the GUIDE ASSY (manufactured by one of numerous suppliers for LG).
This defect caused fill water to enter the wrong pathway within the GUIDE ASSY (and into the FLOAT ASSY).
The symptom will be "air sucking sounds/poor wash results/E1 or 1E errors".
The correction is to install a new GUIDE ASSY (4975DD1001A
Additionally---models built from March 2010 through April 2010 (small number of units) did have a ***missing*** Guide Rib in the Wash Motor/Filter Housing.
Replacing the FILTER HOUSING (ADQ32598202
)---resolved this issue.
Lastly---if a customer complains of poor wash results (ie.,"crappy dishwasher")---check the DRAIN HOSE installation.
The Drain Hose must be connected to a ***Sink Air Gap***.
Lacking an Air Gap---can cause *siphoning* of wash water during a cycle.
To correct siphoning (which can cause noise/E1-1E errors)---several possible solutions are available.
1) Add a Sink Air Gap (easiest and best solution)
2)Replace the Drain Hose with a re-designed one (AEM69433801)---this would also require replacing the Guide Assy (4975DD1001A
The new Drain Hose (which is now on all LG dishwashers--and therefore a Sink Air Gap is not needed) has an anti-siphon break on it---of which a small diameter hose is attached---and is to be installed on the top nipple fitting on the re-designed Guide Assy.
3) Replace the MAIN BOARD.
The revised software of the Main Board---eliminates the *PARTIAL DRAIN* of dirty wash water and re-fill of clean/hot water during the cycle.
This feature of the wash cycle---is what caused the siphoning problem---especially in homes where the drain has no Sink Air Gap.