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Found this -
The Water Level Frequency Sensor operation is based on the displacement of the *coil* attached to the diaphragm.
When the *coil* raises or lowers---it changes the electronically resonant characteristics of the oscillator circuit.
The water level is measured by the Main Board---by frequency readings.
I've never had a failed Water Level Sensor.
It is best tested while on the washer---by using the TEST MODE.
On most LG washers---the Test Mode is enabled by pressing and holding the SPIN SPEED and SOIL LEVEL buttons---and then pressing the POWER button (release all 3 buttons and wait for the door to lock).
Press the START / PAUSE button 4 times at one second intervals (Prewash Cold Water Fill)
The display read-out on the Control Panel will show the *frequency*
Empty---the frequency read-out should be about 255
A tub full of water should show a frequency of about 214 (depending on model number)
Some of the errors that can be displayed---relating to water fill are...
Little or no water---usually caused by a failed Water Valve
Too much water (overflow detected)---Can be a failed/stuck open Water Valve or blockage in the black air tube which is connected to the Water Level Frequency Sensor. Disconnect the tube from the sensor---and blow air back into the tub to clear obstruction.
To test the Water Level Frequency Sensor outside of the washer...
Use a test meter to check the ohms between pins 1 and 3 (should have between 21 & 23 ohms).
Found here - https://appliantology.org/blogs/entry/698-understanding-how-the-water-level-sensor-in-lg-washing-machines-work/
common faults include the rubber pressure hose rubbing and a hole forming causing the pressure switch not to recognise the water level. un plug the appliance, take the top off, find the pressure switch and you will see a rubber black or clear hose running from what is normally a circular item approx 2" diameter and a hose running doen to the drum, check this hose for splits or tears.
Possible there are errors in the program memory. Power off the washer for half an hour, press and hold down the start button , then switch on. Try also with another program. Also check if the inlet filter is clogged and the water flow is good, if not clean. Also check the water level pressure sensor.
In my research, the PE error relates to the fill level of the washing machine. The fill level sensor is a pressure operated device. There is a sealed air line that goes from the bottom of the tub to an air pressure sensor. As the tub fills, it compresses the air in this air pressure sensor. When the tub is filled to the level selected on the dial, the sensor stops the fill cycle.
This air line can be plugged or the sensor itself can be faulty. This air pressure sensor is usually located near the top of the tub just under the top cover. If you can locate it, disconnect the air line from the pressure sensor and blow through it - it may be blocked by lint and soap from several washing cycles. There may be a filter in this line to help prevent this blockage. But the filter may have become blocked itself.
your fill switch is either bad or "gllitched" and the timer cannot move until this switch senses the right amount of water for the load unless its an electronically sensed water/load capacity filled machine,when it starts,the water fills the unit and the pressure switch shuts the water fill off when at selected water level and powers the timer to continue the wash cycle,it works off a "bellows" on air pressure to change a switch by air pressure to operate the machine when full of water
If you can unplug the washer and the washer keeps filling with water, then the control valve assembly is shot and needs to be replaced (not hard, just takes a bit of time).
If you unplug the washer and water stop filling, then there is a problem with the timer switch and / or water level sensor. Timer switch is not big deal to replace either (easier than valve assembly, but costs more). Level sensor hard to replace since located near the top of the basket inside the washer.
If washer doesn't fill with water until you start a cycle, and then won't stop filling, then it is level sensor, or possible timer issue.
You can probably get replacement parts from local appliance shop, as well as some pointers on how to change the parts based on above testing.
Hi, If you turn the water source valve on and water starts filling the machine even tho the machine is off, change the inlet valve. If you have to start the machine so water will fill but, the water does not shut off at the desired level, there is a problem with the water level switch. I hope this helps you. Please let me know if I can assist you further.