By turning the dial of your manual humidistat to a setting above the “click point” you should see water coming out of the drain line within a few minutes which would indicate your humidifier is working.Click to see full answer. Moreover, how do I know if my humidifier is working properly?Check the humidity and reduce it immediately if the room feels particularly dense and moist, curtains and pillows feel damp, or condensation is building up on windows or window sills, which are all signs that the humidity is too high in the room.Additionally, what should my Aprilaire humidifier be set at? Aprilaire humidifier’s are designed to maintain a relative humidity level of 35% anytime the outside temperature is 20F or above at an indoor temperature of 70F. Accordingly, how do I know if my humidifier solenoid is bad? You can see that the multimeter is showing approximately 24 volts AC to the solenoid. If you see this voltage being displayed and the solenoid is not allowing water to flow to the humidifier, then the solenoid is defective and needs to be replaced.Why is my whole house humidifier not working? Remove the furnace humidifier that’s not working Furnace humidifiers are pretty simple gadgets. When they Stop working, the cause is usually a clogged or burned-out solenoid water valve or a bad drum motor. Turn off the power to the furnace and humidifier.