The part(s) or condition(s) listed below for the symptom Humidifier drum won't turn are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
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
The drive belt might have broken or stretched out too much. If the motor is still working and the drive belt is in place but seems to be slipping, replace the drive belt. If the drive belt is broken it will have to be replaced. A broken drive belt usually does not indicate any other problem, over time they simply dry out and break. If the humidifier drum won’t turn, the drive belt might be broken or stretched out. First, make sure that the drive motor is working properly. If the drive motor is working, inspect the drive belt. If the drive belt is loose or broken, replace it.