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d. If there are no signs of distortion, remove the blower wheel (see: Blower Wheel
Removal
) and activate the unit. Notice if the motor shaft rotates without the blower
wheel. If the motor shaft operates, the problem is related to the blower wheel.
4. If the motor shaft does not turn on all speeds, or seems sluggish, it may be due to a
build-up of dirt and grime on the motor shaft. To remedy this.
a. Clean the dirt and grime from the motor shaft using a soft cloth.
b. Squirt a few drops of lubricating oil (“3 in 1” type oil, not WD-40 type oil) in the slot on
the shaft to lubricate the bearing.
5. If the blower wheel vibrates:
a. Check for bent or warped blades.
b. Check for loose or worn drive grommet.
Motor Shaft
10
Troubleshooting Guide
Replace the blower wheel if
blades appear warped or
bent.
Replace the drive grommet.
If the motor shaft rotates
then replace the blower
wheel drive grommet and
bearing wall. If the motor
shaft does not rotate, replace
the motor.