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Symptom
Excessive noise
Fan inoperative
Insufficient air
flow
TROUBLESHOOTING
Possible Cause(s)
Dry motor bearings
Loose propeller
Bent or damaged
propeller
Loose guard assembly or
motor fasteners.
Blown fuse or open
circuit breaker
Defective motor
Switch in OFF position
Blocked intake or
exhaust opening
Low voltage
Speed control set too low Increase speed with
Solution
Re-lubricate motor
bearings as per instructions
or replace motor.
Tighten set screws on
propeller hub.
Replace propeller
Tighten as required to 15-
20 lbs. per inch.
Replace fuse or reset
circuit breaker
Replace motor
Turn switch ON
Clear intake and exhaust
openings of any
obstructions.
Clean motor, guard,
propeller, and shutter
assembly. Increase the
opening of the fresh air
intake.
Check electrical wiring.
controller
8
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