Also in this article:

• How to fix a noisy humidifier
• How to fix a humidifier that doesn’t humidify well
• How to fix a humidifier that leaks or gives off an odor

When a humidifier doesn’t run, it generally means it isn’t receiving electrical power or the controls have automatically shut it off. Do the following to source the problem:

1) Be sure the humidifier is plugged into an outlet that works and that the unit is turned on. Check the electrical receptacle for power using a working lamp, appliance, or voltage tester. If the receptacle seems to be dead, check the circuit breaker or fuse that serves the humidifier’s circuit.

2) Check the setting on the humidistat. If it’s set lower than the room’s relative humidity, the humidifier won’t go on; in fact, it may take several hours for the humidistat to respond to the room’s changing humidity.

3) Be sure the humidifier’s reservoir is full of water.

4) Unplug the humidifier unit. Check the power cord and, if need be, repair or replace it.

5) Remove the humidifier’s cover panel. Remove the humidistat and check it as described in Humidifier Troubleshooting & Repairs. Replace it if necessary.

6) If the humidifier still doesn’t work, call in an appliance repairperson, take the unit into an appliance repair shop, or replace the unit.

How to fix a noisy humidifier

A noisy humidifier may be the result of an unlubricated fan motor or a drive mechanism clogged with debris. Periodically clean the water reservoir, fan, and nozzle to ensure they are working properly.

Lubricate the fan motor bearings with SAE #20 oil. Be sure to consult your owner’s manual for other proper care and maintenance procedures to keep your humidifer functioning smoothly and efficiently.

Another cause of noise can be vibrating parts. To check for this:

1) Unplug the unit, remove the cover, and look for any loose parts. Tighten any loose screws.

2) Wiggle the fan to see if it is loose on its shaft. If it is, tighten the mounting fasteners.

3) If the humidifier continues to makes noise, call an appliance repairperson or take the unit into an appliance repair shop.

How to fix a humidifier that doesn’t humidify well

If your humidifier doesn’t do a good job or runs constantly, it may be undersized for the space or humidified air may be escaping from the room. Perform these diagnostics:

1) Check the unit’s specifications to be sure it can handle the room size.

2) Be sure your home’s doors and windows are closed; also check the fireplace damper.

3) Be sure the reservoir has plenty of water.

4) Be sure walls or curtains are not blocking the unit.

5) Disconnect the power cord and clean the unit according to the owner’s manual.

6) Lubricate the fan motor bearings with a couple of drops of light oil if the motor has oil holes (some units are oil-less).

7) If the humidifier still operates poorly, call an appliance repairperson or take the unit into an appliance repair shop.

How to fix a humidifier that leaks or gives off an odor

If water drips or pools at the base of your humidifier:

1) Disconnect the power. Check the pan or reservoir, and empty it if necessary.

2) Be sure the wick, hose, or other water-delivery system isn’t kinked or fouled.

Odors are common because water stagnates in the tank. If the humidifier gives off an odor:

1) Unplug the unit, empty the reservoir, and mop up any damp areas.

2) Clean the tank and evaporator belt with a mixture of 1 gallon water and 2 tablespoons chlorine bleach.