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GENERAL TROUBLESHOOTING
Some issues can be resolved before requesting service. Review the troubleshooting tips listed below before
contacting Customer Service for support.
Customers in the United States
For questions about your product or
customer service inquiries, please call our
toll free number (877-BIG-FANS) or visit
www.bigassfans.com/service.
Customers outside of the United States
For questions about your product or customer
service inquiries, please contact your local Big Ass
Solutions representative or fill out a contact form at
www.bigassfans.com/service.
Symptom Possible solution(s)
The fan is turning in the wrong
direction.
To be eective, the fan should be rotating in the counterclockwise
direction when viewed from the floor. If the fan is not rotating in the
counterclockwise direction, press the F/R button on the controller.
A popping noise is coming from
the fan.
Airfoil noise comes from airfoils
that are not tightened to the
specified torque.
Disconnect the fan from power, and then tighten the airfoil fasteners
to 29 ft·lb (39.3 N·m). If the popping still occurs, verify that the airfoils
are not contacting each other. If they are, contact Big Ass Solutions
Customer Service.
The fan will not start.
Verify the following:
• Make sure that all wires are securely connected.
• Verify that supply power is adequate and functional.
If the fan still does not start, contact Customer Service.
The VFD generates radio
frequency noise (RF).
VFDs generate RF noise in many
ways, but this can be prevented
using the proper wiring practices
outlined in “Electrical Installation.”
Verify the following:
• Do not run your controller and sensitive equipment on the same
power line.
• Ensure proper grounding at the motor, controller, and from the
controller to the utility.
If the noise is still present, contact Customer Service.
The motor makes noise when fan
speed is increased.
Audible high frequency carrier
noise may be an indicator of a
stall condition.
Verify motor currents are within limits. Reference the technical
specifications in this manual to confirm motor currents for your fan
size.
The fan wobbles during operation.
• Verify that the mounting structure is rigid enough to support the fan
and that the fan is not being exposed to external air forces.
• If guy wires were installed, confirm proper installation. If guy wires
were not installed, contact Customer Service.
Note: Some motor, gearbox, or drive noise is to be expected and is normal.
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