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Test the fan motor using a multimeter.
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A humidifier is an appliance designed on the principle of evaporation to increase moisture in the air. Water from a reservoir is added to an evaporation pad. A fan blows air through the pad. Fine droplets of water are placed in the air, thus increasing the humidity of the room. Both room and tabletop humidifiers work on this principle.
The two types of evaporative room humidifiers are drum and pump. A drum humidifier gathers water into an evaporation pad by immersing the pad, wrapped around a drum, into a reservoir of water. Water dripping from the rotating pad is absorbed by air current produced by a fan. A pump humidifier uses a pump to gather water from the reservoir and distribute it through the evaporation pad. Air from the fan blows through the pad and picks up the droplets to moisturize the air. Both types of humidifiers have operational controls, an evaporation pad, a fan, a water reservoir, and a humidistat. Some forced-air distribution systems include an evaporative humidifier that works in the same way.
An ultrasonic humidifier works on completely different principles from standard room humidifiers. It's electronic. Beyond normal cleaning and testing of the electrical cord or switch, service of an ultrasonic humidifier should be left to a service technician.
Service an evaporation pad on a pump humidifier:
- Unplug the humidifier or otherwise make sure that power to the unit is off.
- Lift the pad frame from the humidifier housing and hold it so excess moisture will drip back into the reservoir.
- Remove the pad from the frame.
- Rinse the pad with clean water or replace it. If you use soap or detergent, make sure the pad is completely rinsed of residue before reinstalling.
- While the humidifier is open, clean the reservoir and inspect the inside of the appliance for any obvious problems.
Service the float control:
- Remove the top cover and inspect the float. Make sure the float rod is straight and secure and that the float is clean. When cleaning the float, make sure you don't bend the rod.
- Move the float manually to determine at what level the float switch is activated. If necessary, adjust the switch to make sure it activates at the appropriate level.
- Check all electrical connections on the float switch to make sure they are tight.
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