<<<I had thought the problem was a low water level, and the cyclical snoring sound was the pump sucking air.>>>
If the water valve malfunctioned---and allowed too little water to enter the tub---this will trigger an "IE" error.
If the DRAIN HOSE is incorrectly installed (through the floor,for example--rather than to a sink disposer) and loses water gradually during the *wash cycle*---this will cause an error---"1E".
In addition to the "1E" error---the Wash Motor will run normal (sound) and then accelerated (higher pitch motor sound)---then back to normal. Continually---until the correct amount of water is in the tub (or the "1E" error occurs).
While replacing the Sump Assy---take a moment to inspect the FLOAT ASSY (4769DD2001A
) located on the left side of the dishwasher.
Older LG dishwashers have a metal side panel---which must be removed to access the Float Assy/Guide Assy.
Check the condition of the two *styrofoam floats* within the Float Assy.
If *well water* is used---it's entirely possible that the *floats* are "gummed up" with dirt/clay/grime---occasionally affecting water level accuracy/consistency (correct amount needed).
If heavily contaminated---an attempt to clean out the Float Assy chambers can be made---or replace the Float Assy altogether.
However---all LG 6810 dishwashers *did* have the "flawed" Wash Motor.
Typical symptoms of a failing Wash Motor...
1) Poor wash performance/results
2) Noisy during wash cycle (chirping/growling/grinding/howling/"dirt bike sound"/"hooting owl" are some of the descriptions that owners have mentioned over the years)
3) "LE" error (dead unit).
Remove the front panel/cover of the dishwasher.
Check/inspect the wire loom that runs/routes from the bottom of the door---up to the detergent dispenser assy.
Verify that none of the wires are damaged (pulled apart).
Wrap the entire wire loom with electrical tape---from the bottom of the door---up to the detergent dispenser.
Cut a small section of cardboard and place it between the wire loom and the sticky door liner/insulation.
This will prevent future damage to the wires caused by the black tar-like insulation.
Newer dishwashers use a *cloth* liner.