Commonly accompanies by the infamous LE error code.
The Hall Effect sensor is easily removed and replaced.
You’ll have to remove the rotor and stator to access the sensor.
The rotor is attached to the shaft by one large bolt.
When replacing the rotor, you’ll probably need a helper to hold
the drum in place when you push the rotor onto the shaft.
Otherwise, the drum may move forward enough to make replacing the bolt difficult.
The helper can also hold the drum from turning while you tighten the bolt.
Before going to this trouble, check the connector on the main board.
It is the red connector closest to the heat sink.
Pull the connector off and verify the board is receiving a signal from the sensor.
Part link to the Hall Sensor ==> http://www.repairclinic.com/PartDetail/Rotor-Position-Sensor/6501KW2002A/1268238?modelNumber=WM2277HW