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Troubleshooting
The following table lists causes and corrective actions for possible problems with the fan units. Review this
list prior to consulting manufacturer. The following table lists causes and corrective actions for possible
problems with the fan units. Review this list prior to consulting manufacturer.
Problem Potential Cause Corrective Action
Fan Inoperative
Blown fuse/Open circuit breaker
Check amperage.
Check fuse, replace if needed.
Check circuit breaker.
Disconnect switch in “OFF”
position
Place switch to the “ON” position.
Incorrect wiring to motor
Inspect motor wiring.
Verify connections with wiring
diagram located on fan motor.
VFD Overloaded
Check amps.
Reset VFD.
Motor Overloaded
Incorrect fan rotation
Verify that the fan is rotating in the
direction shown on rotation label.
Incorrect wiring to motor
Inspect motor wiring.
Verify connections with wiring
diagram located on fan motor.
Overload in VFD set too low Set overload to motor FLA value.
Insufficient Airflow
Incorrect wiring to motor
Inspect motor wiring.
Verify connections with wiring
diagram located on fan motor.
Poor airflow conditions
There should be a straight clear
path for air under the fan.
Fan speed too low
Increase fan RPM. Do not
overload motor.
Excessive Vibration and Noise
Damaged or unbalanced blade Replace blade.
Gears need lubrication or
replacement
Lubricate or replace.
Fan speed is too high Reduce fan RPM.
Room Temperature is too Warm
and Fans do not cool
Fan Activation Temperature Set
Too High
Reduce the fan activation
temperature
Fan running incorrect direction
Fan Should Spin Counter-
Clockwise when looking up from
floor in cooling mode
Equipment or Storage Items
blocking airstream
Clear equipment or storage items
from under fan
Fans Spinning Wrong Direction
3 phase Motor output wired
backward
Change 2 of the 3 phase wires on
the output of the VFD feeding the
motor, or change in software.
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