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Identify Problem
03
Find Solutions
01 - Humidifier Drive Motor
If the drum does not rotate and the drive motor is not turning, check to be certain the motor is getting power from the humidistat. If the motor is working but doesn't seem to have the strength to turn the drum, replace the drive motor. If the drive motor is clicking or only seems to spin the drum partway before giving up, replace the drive motor.
If the humidifier drum won’t turn, the drive motor might be defective. First, make sure that the motor is getting power. If the motor Is getting power
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Top Solution
02 - Humidifier Control Board
The humidifier gets its power from the furnace control board. If no power is getting to the humidifier and you've determined the furnace control board needs to be replaced, you will have to use the furnace model number to get the correct part. The humidifier model number will only show parts specific to the humidifier.
Highly Likely
03 - Humidifier Transformer
Some furnaces have a separate transformer to provide voltage to the humidifier to turn the drum. If the humidifier is not receiving the proper voltage, but the contacts in the humidistat are closing as expected, it's likely the transformer has failed and the component will need to be replaced.
Common
04 - Humidifier Humidistat
If you've determined the humidifier's drum drive motor is functional but not receiving power, you should confirm the contacts in the humidistat 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
05 - Normal Operation
The humidifier drum only turns when the furnace is on. If the drum is turning when the furnace is running and the humidistat is on, this is normal operation.
Less Common
06 - Humidistat turned off or not set properly
If your humidifier drum won't turn, 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.
Uncommon But Possible