The 4 most common part(s) or condition(s) which contribute to the symptom Humidifier water supply problems are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.
For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.
The float assembly lets water flow into the reservoir until it is full. If water does not enter the reservoir, check to see if the float bulb is moving freely up and down. The float assembly also has a small, integrated orifice and fill tube. If water is dripping in very slowly the float assembly may need to be replaced - they are difficult to clean effectively. If after removing the water supply line from the float assembly there is still good water pressure, replace the float assembly.
If water does not enter the humidifier the water inlet valve might be burned out or clogged. The water inlet valve has an electrical solenoid which can be checked for continuity. If it doesn't have continuity the valve will need to be replaced. Also, check to see whether it's getting voltage. Most valves operate on 24 volts, but read the specifications on the valve to be sure. If the valve is working, and clicks when it opens and closes after turning the humidistat, it might be clogged. Most humidifier water inlet valves have a small orifice attachment. If the orifice is clogged it will restrict the water flow.
If water does not enter the humidifier the saddle valve might be restricted. The saddle valve is a small, brass water supply valve which is often clamped to a copper household water supply pipe. Often the saddle valve gets clogged with sediment or calcium deposits. It's usually not worth trying to clean these valves. They are difficult to clean completely and are inexpensive to replace. Turn off the old valve and leave it where it is. Install the new saddle valve in a different location on the pipe. Be certain not to use a self-piercing saddle valve because they clog very easily. Use the type that requires drilling a hole in the water supply pipe.
If water does not enter the humidifier the humidistat might not be set properly or working properly. Try turning the humidistat to its highest setting and see if water enters the humidifier. Listen for a click inside the humidistat to know whether the contacts are closing. If the humidistat is providing power but water still does not enter the problem is somewhere else, perhaps the water inlet valve or water supply line.