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REPAIR PARTS:
3. Fan Blades – Repair of individual fan blades or propeller assemblies is not recommended. Contact factory
with blade size, number of blades, bore size, motor HP, air flow direction, rotation, fan RPM or sheave sizes
and any order/tag information that is available for replacement.
4. Misc. Parts – Not available from local trade channels should be returned for repair or replacement. Be sure to
obtain return tags or authorization before shipment.
5. Electric Motors – Repair or replacement of motors is normally performed by a repair station authorized by the
manufacturer. Contact your representative or the factory for locations nearest to you. DO NOT ship motor to
the factory without specific authorization.
FAN TROUBLE-SHOOTING CHART
PROBLEM
Excessive Vibration
Excessive Horsepower
Too Little Air
Too Much Air
Fan Does Not Operate
Excessive Noise
POSSIBLE CAUSES
Propeller, wheel or sheaves loose on shaft
Out of balance propeller
Excessive buildup of dirt/dust on propeller
Bent shaft
Weak mounting base for fan
Fan mounting bolts loose
Loose or worn bearings
Bearing or drive misalignment
Structures not crossbraced (wall fans)
Curb not flat and level
Static pressure higher than design
Wheel or propeller rotating in wrong direction
Fan speed higher than design
Restricted fan inlet or outlet
Filters are dirty or clogged
Wheel or propeller rotating in the wrong direction
System is more restrictive (more static pressure) than expected
Fan speed lower than design
Inlet or Outlet screens clogged
Filters not in place
Fan speed higher than design
System is less restrictive (less static pressure) than expected
Wrong voltage
Electricity turned off or note wired properly
Blown fuses
Overload protector has broken circuit
Propeller, wheel or sheaves loose
Accumulation of material on propeller
Worn or corroded propeller
Wheel or propeller out of balance
Wheel or propeller hitting housing
Bent shaft
Loose fan mounting bolts
Rattle of components in high velocity airstream
Electrical noise
Noise from high velocity air system
Vibrating parts not isolated from building
Vibrating duct work
4
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