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11
1. Disconnect power source before servicing.
2. Periodically clean off accumulated dirt from the propeller, guard, motor, and
shutter.
Do not depend on any switch as the sole means of disconnecting
power when installing or servicing. If power disconnect is not visible,
utilize OSHA Lock out/Tag out procedure.
Failure to do so may result in fatal electrical shock.
Employ proper lock-out/tag-out procedures when performing
maintenance.
Symptom Possible Cause(s) Solution
Excessive noise
Loose propeller Tighten set screws on
propeller hub.
Bent or damaged
propeller
Replace propeller
Loose guard assembly or
motor fasteners.
Tighten as required to 15-
20 lbs. per inch.
Fan inoperative
Blown fuse or open
circuit breaker
Replace fuse or reset
circuit breaker
Defective motor Replace motor
Switch in OFF position Turn switch ON
Insufficient air
flow
Blocked intake or exhaust
opening
Clear intake and exhaust
openings of any
obstructions.
Clean motor, guard,
propeller, andshutter
assembly. Increase the
opening of the fresh air
intake.
Low voltage Check electrical wiring.
Speed control set too low
Increase speed with
controller
TROUBLESHOOTING
MAINTAINANCE
AND CLEANING
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