It may just need to be replaced. This is most likely a defective motor. It may occur straight out of the box, or after using for awhile.
1) Unplug and reconnect the lifter cord to the GN wireless system. Try turning the headset on and
off to test.
2) Adjust the lift level switch from “-” to “+” and test the headset.
If there are no changes after trying these simple steps, then replace the lifter.