Appearance of error code NE on LG dishwasher indicates problem with vario motor or micro switch, a switch which is responsible for signaling the position of the motor to the main board.
Basically, the water is redirected from the lower wash arms to the upper wash arms (back and forth) every 90 seconds, the motor and the switch are responsible for this task. When the main board does not receive the signal that tells the main board that the position of the micro switch has changed, the error code NE is displayed.
Like with all such errors, most of the time they appears because of some small issue that can be easily fixed by turning Off/On your dishwasher. If the error still persists after this practice, then it shows that there is a mechanical fault in the dishwasher.
Fix # 1: Check the Wiring
Turn off the dishwasher. Follow the wires to the microswitch and the engine. Make sure that these wires are connected firmly.
Fix # 2: Check Vario Motor for Fault(s)
If you have checked the wires and there seem to be no issue in them, then follow these steps:
Disconnect the wires first. Measure the resistance of the motor through multimeter. It should show about 4000(Ohms). If the resistance shown is infinite, you should replace the electric motor.
Steps to replace the electric motor:
Drain and inlet hoses must be removed. Disconnect the wires attached. Remove the bottom panel of the dishwasher. Find this number (4681ED3001D) and locate a green, round shaped part near it. Vario Motor should be installed here.
Fix # 3: Check Main-Board for Damaged Wiring
If you have followed all the fixes given below, now you should examine the main board of the dishwasher. Look for damaged wire tracks and fix them. Take a look at the parts, see if they are damaged.
If you cannot get the main-board fixed, then you should opt to buy a new one. These are all the suggestive fixes for the LG Dishwasher Error Code NE. Follow these solutions step by step to ensure that this error does not display again. Hopefully these fixes provided above, gets rid of the issue for you.
Fix # 4: Resistance of Diverter Switch
If none of the above solution/fix worked to fix the error code NE on LG dishwasher, then you should measure the resistance of the micro switch. The part number of micro switch is 3W40025C.
In case of the piston installed, the resistance should be infinite. If the resistance is same in both cases, then the micro switch is causing the anomalies. You should replace the micro switch with a newer one to get rid of the error code NE on your LG dishwasher.