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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.

Troubleshooting Chart

Problem

Potential Cause

Corrective Action

Fan Inoperative Blown fuse or open circuit breaker Replace fuse or reset circuit

breaker and check amps

Disconnect switch in “Off” position Turn to “On” position

Motor wired incorrectly Check motor wiring to wiring

diagram located on fan motor

Broken fan belt Replace belt

Motor starter overloaded Reset starter and check amps

Motor Overload Fan rotating in the wrong direction Be sure fan is rotating in the

direction shown on rotation label

Fan speed is too high Reduce fan RPM

Motor wired incorrectly Check motor wiring to wiring

diagram located on fan motor

Overload in starter set too low Set overload to motor FLA value

Motor HP too low Determine if HP is sufficient for

job

Duct static pressure lower than

design

Reduce fan RPM

Insufficient Airflow Fan rotating in the wrong direction Be sure fan is rotating in the

direction shown on rotation label

Poor outlet conditions There should be a straight clear

duct at the outlet

Intake damper not fully open Inspect damper linkage and

replace damper motor if needed

Duct static pressure higher than

design

Improve ductwork to eliminate or

reduce duct losses

Blower speed too low Increase fan RPM. Do not

overload motor

Supply grills or registers closed Open and adjust

Dirty or clogged filters Clean and/or replace

Belt slippage Adjust belt tension

Excessive Airflow Blower speed to high Reduce fan RPM

Filters not installed Install filters

Duct static pressure lower than

design

Reduce fan RPM

Excessive Vibration and Noise Misaligned pulleys Align pulleys

Damaged or unbalanced wheel Replace wheel

Fan is operating in the unstable

region of the fan curve

Refer to performance curve for

fan

Bearings need lubrication or

replacement

Lubricate or replace

Fan speed is too high Reduce fan RPM

Belts too loose, worn or oily Inspect and replace if needed

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