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Humidifier not working

Brand:Bemis

Model:4900

Product:Humidifier

Common Problems

Diagrams & Manuals Related Videos

Common solutions for: Humidifier not working

01 - Clogged Saddle Valve

The saddle valve is a small brass water supply valve which is often clamped to a copper household water supply pipe. Over time, the saddle valve can become clogged with sediment or calcium deposits. Because it is difficult to clean a saddle valve thoroughly, and because the replacement cost is fairly low, we recommend replacing the saddle valve if it is restricted.

Top Solution

02 - Transformer

Some furnaces have a separate transformer to provide 24 volts to the humidifier. If the water inlet valve is not receiving 24 volts and the contacts in the humidistat are closing as expected, it's likely the transformer has failed and the component will need to be replaced.

Highly Likely

03 - Humidistat

The contacts in the humidistat should close when the dial is set higher than the actual humidity in the room. You can use a multimeter to confirm the humidistat contacts are closing. If the contacts do not close as expected, the humidistat is defective and should be replaced.

Common

04 - Water supply valve turned off

Confirm the water supply shut off valve is in the on position. You may have to rotate or pull a knob or move a lever to open and shut the valve. You can follow the water line from the humidifier's water inlet valve to find the water supply valve.

Less Common

05 - Humidistat turned off or not set properly

If your humidifier is not working, first verify that the humidistat is on and set properly. If there is a on/off switch, make sure it's turned on. A normal comfortable humidity range in a home is between 40% to 50%. Refer to owner's manual for guidance.