Lg ld2131sh dishwasher makes a constant, metal on metal grinding sound

Check the drainage line to make sure nothing blocks. If you replaced the garbage disposal recently, make sure there is metal piece that you have removed it. It is called knockout plug. You can use a screwdriver to poke it through. You need to take it out. Check YouTube, there are helpful videos to teach you how to remove it. Sometime there are residuals inside the drainage lines. You may need to take them out to clean it.

Could be the hinge, most likely the lower hinge. Fridge hinges usually have a plastic insert in the door to prevent metal to metal contact. This insert sometimes wears prematurely and then metal may start to make contact , thus the grinding sound. The insert can be changed fairly easily if you are so inclined.

bearings are possibly going out on the motor. If the sound is like metal grinding on metal then that's the problem. To repair it you will need to remove the dishwasher from under the cabinet and flip it upside down to access the motor assembly. Take the model # and serial # to an appliance part supply for proper motor replacement. It isn't hard to do if you have the time. Make sure the unit is unplugged and the water line has been disconnected before any repairs start.

Hope this helped you

Dave

I need operating manual of LD2131SH, thanks

If the machine works fine other than the grinding sound, there is a blade that is in the center and grinds up residue, somtimes it gets a object in the
space and wont grind it up. If you are ok at taking things apart and puting back together, disasemble the center sprayer, screen and tube to top sprayer, the blade is under the screen housing. clean out and reasemble and should work fine. not hard to do really, when you reasemble do not tighten screws as you intall them as they allign everything, intall then all loose then tighten snug NOT to tight as they go into plastic.

debris in pump. unplug and disassemble pump. clean out and reassemble

Well done by resolving this problem. The other way to avoid the siphoning problem through the drain hose is adding an air gap valve/connector (available at any hardware store). You can use it even if you don't have a garbage disposal in your kitchen sink. That will assure that you have the proper height of the drain hose.
Hope this helps!

E1=Water inlet Error

Not reached to the normal
water level in spite
of 10 min. water supply

Causes:

The Water Supply Tap is closed.
The Water Supply is shut off.
The Inlet Hose is kinked.
The Water Pressure is very low.
(below 10 psi)
Inlet Valve is OK?
The filter of Inlet Valve is clogged
by impure water.
The Hall sensor is OK?
The Impeller of Air Guide is bound

Solutions:
Take action on Water Supply
device.
Measure the electric resistance of
Inlet Valve. (950-1300 )
Clean the filter of Inlet Valve.
Check the frequency of Inlet Water
by the Test Mode.
Replace the Air Braker.