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Troubleshooting
Symptom
Possible Cause
Blown fuse or open circuit breaker
Broken fan belt
Blower fails to
operate
Defective motor or capacitor
Motor starter overloaded
Airflow too high
Static pressures are higher or lower
than design
Blower rotation is incorrect
Motor overamps
Motor voltage incorrect
Motor horsepower too low
Shorted windings in motor
Mixing box damper not fully open
System static pressure too high
Blower speed too low
Mixing box dampers closed
Insufficient airflow
Dirty or clogged filters
Leaks in ductwork
Elbows, or other obstructions may
restrict fan outlet
Belt slippage
Blower fan speed too high
Filter(s) not in place
Too much airflow
Insufficient static pressure
(airflow resistance)
Wheel rubbing on housing
Loose wheel on shaft
Loose motor or blower sheave
Belts too loose
Belts too tight
Worn belt
Excessive noise
or vibration
Motor base or blower loose
Worn bearings
Bearing and drive alignment
Motor out of balance
Wheel out of balance
Sheaves eccentric or out-of-balance
Accumulation of material on wheel
8
Model LFC Low-Profile Fan Coil
Corrective Action
Replace fuse or reset circuit breaker and check amps
Replace
Replace
Reset starter and check amps
Check airflow and adjust drives if needed
If higher, ductwork should be improved
If lower, fan RPMs should be lower
Check rotation and correct
Check motor nameplate and supplied voltage
See specifications and catalog for fan curves to determine
if horsepower is sufficient
Replace motor
Adjust damper linkage or replace damper motor
Improve ductwork to eliminate losses using good duct
practices
Check for correct drives and RPMs with catalog data
Open and adjust
Clean or replace
Repair
Correct or improve ductwork
Adjust belt tension
Check for correct fan RPM
Install filters
Induce static pressure into system ductwork
Center wheel
Tighten wheel setscrew
Tighten sheave setscrew
Adjust belt tension after 24 hours of operation
Loosen to maintain 3/8 inch deflection per ft. of span
between sheaves
Replace
Tighten mountings bolts
Replace
Realign
Replace
Replace or rebalance
Replace or rebalance
Clean wheel and housing
®
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