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problem is with main board MOSFET ,FET or Transistor , that are not switching your drain pump at right time , if your'e pump is fine, , you should check drain pump separately by giving it separate supply. ( see its data sheet for power )
Check for clogged/kinked drain hose then open the small door at the lower left of the machine. Located behind the small door is the drain filter and the emergency drain hose. Remove the drain plug and drain the water into a container that's enough to hold such. You may need to drain the water by gravity by placing the drain hose (main) over a container. Position the container as low as possible to extract as much water. Once fully drained, remove the drain filter by turning the knob counterclockwise. Place a piece of the towel under the filter to catch residual water. Clean the filter and try to reach in the pump impeller and check it for restriction or damage. Replace the drain pump if the impeller is damaged or restricted and cannot be freed, or if it just whirs but water doesn't drain.
The water pump can be blocked and thus stop the machine from finishing the wash cycle. In front on the bottom there is as hatch that can be opened with a flat screwdriver, the small black rubber pipe can be used to first drain all the water before the opening the filter. Small objects such as coins coluld be found in here, blocking the pump. Clean the pump by removing these, optionally blowing into the outlet (yuck!), to dislodge anything. If that does not help to fix the problem, you can clean that actual water pump, but this requires you to use a screwdriver to remove the pump.
Tilt the machine on its side, the pump is attached with 3 self-tapping screws. (if you can't figure out what the pump is you should probably let a technician do this). The pump has 2 parts to it, take it apart carefully and clean out all the dirt that has accumulated in there. Plastic friendly, waterproof grease can be applied to the pump spindle and bearing if available.
If the problem still persists a new pump is available from LG at a reasonable cost.
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