Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container
Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)
If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to detrmine the reason(s). Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.
If no click, it could be the humidistat or there is no power to the unit. If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.
Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.
One more thing....although not every water valve has one, check for a plugged inlet screen at the entry to the water valve (solenoid)One more thing....although not every water valve has one, check for a plugged inlet screen at the entry to the water valve (solenoid)
Answers & Comments
Turn off the water to the humidifier
Disconnect the water line to the inlet water valve (the solenoid), catch any excess water or drips in a small container
Turn the water back on slowly and see if water flows through the open line (the one you just disconnected - catch the water in a small bucket)
If you have water to the valve, it's probably the solenoid valve - you can test this by reconnecting the water line and turning the humidistat all the way up. You should hear a click as the solenoid tries to open. If it clicks and no water comes out it's the valve. If there is no water to the valve, you'll need to detrmine the reason(s). Sometimes the small line tap valves commonly used with humidifiers can plug up or malfunction. If you try to repair or replace the tap valve, make sure the water is turned off.
If no click, it could be the humidistat or there is no power to the unit.
If the humidistat is bad, you won't hear any click and no power will be sent to the solenoid valve. In that case, the humidistat may be defective.
Depending on your comfort level and knowledge, you can try applying power directly to the valve by bypassing the humidistat, but only try this if you are comfortable working with electricity. The voltage should be around 24 volts (in the USA) , which is low, but requires some knowledge.
One more thing....although not every water valve has one, check for a plugged inlet screen at the entry to the water valve (solenoid)