The drain light on my dryer comes on after about 2 min of running. I am unsure of how to clean out the drain system. In the manual all it says for the drain light is drain system needs to be cleaned. I have cleaned out all the filters and the hose in the back of the unit that connects to the drain. Every time I try to use the dryer I hear the drain trying to pump water out of the system. Is there an easy way to fix this???