Fan Size Calculator
This is rarely a problem with a motor. Ensure there is proper voltage going to the fan with a volt meter. Check to see if someone has chained pulleys on the fan. Another possible solution is a faulty fan blade.
Possible causes: loose or worn belts, defective motor bearings and/or defective fan bearings
Possible causes: loose belts, pulley or fan blade, defective motor or no power. Corrective actions: Tighten the belts and clean guards.
Possible causes: faulty switch, defective motor, no power. Corrective actions: replace the switch, replace the motor, check to see if power cord is plugged in.
Before ordering replacement parts, make sure you have the fan model and serial number.
If this is a three-phase motor, simply reverse two of the three phases to reverse the motor direction. If this is a single-phase motor, see the wiring diagram on the side of the motor for reversing instructions. If this is a replacement motor on a barrel fan, check the fan label to ensure it is a Triangle Engineering fan. Many times our motors run in the opposite direction from other manufacturers.
Check for adequate voltage at the motor. Check if the blade and motor can turn freely.
Generally, this happens when the motor reaches the end of its life. It also can be low voltage supplied to the fan. Check to ensure there is voltage at the motor. Check if the blade and motor turn freely.
This is rarely a problem with a motor. Typically, the issue is with excessive intake restriction or excessive exhaust restriction. Read more about excessive intake or excessive exhaust restrictions.
Check to see if the blade and motor shaft turn freely. Check for adequate intake area and exhaust area. If these checks do not stop the humming, the motor most likely needs to be replaced.
