My washing machine makes a high pitched whining noise

Two possibilities: the water is coming in under pressure through a solenoid valve that is not fully open or the pressure pump is whining on its bearings.

What is the model number of the unit?

If your washing machine is making a high-pitched whine or squealing noise while running, the main culprit is usually worn motor bearings. To check the motor bearings, remove the belt and run the motor by itself, listening for the noise. If it makes the noise, than the problem is most likely the result of worn motor bearings.

If your washing machine is making a high-pitched whine or squealing noise
while running,the main culprit is usually worn motor bearings.To check the
motor bearings,remove the belt and run the motor by itself,listening for the
noise.If it makes the noise,than the problem is most likely the result of worn motor bearings.

Hi
to chek what is wrong follow the bellow instruction....
Check the motor bearings
If your washing machine is making a high-pitched whine or squealing noise while running, the main culprit is usually worn motor bearings. To check the motor bearings, remove the belt and run the motor by itself, listening for the noise. If it makes the noise, than the problem is most likely the result of worn motor bearings and has nothing to do with issues in the rest of the washer.
Check for Obstructions
Sometimes coins, bra underwires and other metal objects come loose in the wash and become stuck between the tub and the drum. Using a flashlight, take a good look inside the washing machine. If you see dents, scratches or dings, that's a sign that there either are or have been items bouncing around in there that can make a horrible racket.
Check for Grease Spatter
A high-pitched squealing can be caused when the grease thins around the bearing that's located under the tub. Open up the washing machine and check the interior for grease spatters or spots. That could mean that the grease has thinned out around the bearing and it's making the noise because of rubbing.
Check the Drum for Irregularities
Spin the drum by hand, listening for the noise. If it makes the noise in the same spot with each rotation, the problem could be with the washing machine drum itself. Parts of the drum can corrode over time, leaving it vulnerable to cracks or rust.

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1) Make sure valve is open all the way 2) some machines have a screen inside of the hose hook up which could be clogged. 3) last check to see if it is the hot or cold by switch your selector switch on your machine to hot then cold. If one of these positions eliminate the noise then the valve in the machine is bad.

The LE error code means that you have a motor problem.  The high pitched noise means that the motor sensor has failed and needs to be replaced.  You will need to call a qualified LG technician to replace the sensor.

How deep do you want to get into this?It sounds like the wash pump motor bearings that are worn.You can pull the unit out flip it over and wd40 the bearings in the motor or you can replace the bearings.Try to lube them first.

A loud high pitch whine while running the dishwasher means that there is something caught in the chopper assembly. To get to the chopper assembly you need to take the racks out and take the pump apart from the inside of the dishwasher. The chopper assembly looks like a metal grate with holes in it. And it might not even be stuck in the grate but somewhere in the pump area due to the water being pumped out, so the best idea is to take the whole thing apart and clean everywhere. However I do not recommend doing this unless you are completely certain you will remember where the screws and gaskets go, otherwise you risk damaging your pump or house from a leak or improper installation. You have been warned.

Suggestion: Try some anti-squeek on the belt, or some soap. Plug off the wall first.