My unit CW-3000, 80W, is not pulling water into the inlet and returning water then to the water tank. I’ve checked for blockages in inlet, right tube size, filled water tank full, but there is no suction coming from the inlet tube (that is submerged in water), I took the metal cover off to see functions and there is no leaks, cap is sealed right on water tank, and machine has been above and below my water unit for gravity and water flow reasons. Still no solutions. How can I resolve this?