Chosen Solution
Does any one now what causes a high pitch squeal noise when a LG dishwasher is running its cycle? It is very frustrating and I need to fix it but don’t know what is causing it. I thought that there was just some dirt in the pump so I flushed it out and ran a empty load with just water and vinegar to clean it out and it still does it.
Most likely is: The circulation pump motor has bearings that wear out over time. When the motor bearings fail, they generate a continuous drone. If the motor bearings have failed, you must replace the entire circulation pump.
It may have to do with buildup of residue (soap scum, scale, lime, etc.) in the recirculation system. I contacted LG about this on numerous occasions and they advised running white vinegar or a commercial cleaner through the system. I tried both vinegar and commercial cleaners numerous times, with no positive results. Then, quite by accident, we switched dishwashing detergent from Cascade liquid to Cascade Platinum pods with Dawn. After about a month using the pods, the dishwasher is as quiet as it was when it was new, with absolutely no whistling.
