PNEG-1756
18" and 24" Panel Pit Fan (78° and 90°)
19
9. Troubleshooting
Symptom
Probable Cause(s)
Corrective Action(s)
Excessive noise.
Defective motor bearing.
Defective pillow block bearing.
Parts are not securely anchored.
Damaged fan blade.
Replace.
Replace.
Check all bolts, screws and fasteners.
De-energize fan. Turn prop and check tip
clearance. Do they appear to be approximately the
same? (
NOTE:
They can be a little different without
any problems.
) If they are significantly different,
contact your distributor for more information.
Fan inoperative.
Electricity is turned OFF.
Belt is broken.
Defective motor.
Open power supply circuit.
Contact local utility supplier.
Replace.
Replace.
Replace fuse or reset circuit breaker. Check for
disconnected, cut or damaged power cord.
Insufficient airflow.
Intake/exhaust shutter is jammed/clogged.
Inlet/outlet guards clogged by dirt/debris.
Voltage supplied is not correct (must be
within ±10% of the nominal voltage).
Repair/replace/clean as necessary.
Repair/replace/clean as necessary.
Check line voltage at motor, verify wiring. Check with
local utility supplier for possible line problems.
Excessive vibration.
Fan blade has excessive dirt build-up.
Motor/drive shaft is bent.
Fan blade is bent or otherwise damaged.
Clean unit.
Replace.
Replace blade. Recoat shaft with anti-seize lubricant.
Motor overheats and
nuisance trips.
Intake/exhaust shutter is jammed/clogged.
Inlet/outlet guards clogged by dirt/debris.
Motor has excessive dirt build-up.
Fan blade has excessive dirt build-up.
Building operating static pressure too high.
Power supply voltage is too low.
Repair/replace/clean as necessary.
Repair/replace/clean as necessary.
Clean unit.
Clean unit.
Adjust air inlets to lower static pressure.
Check line voltage at motor; verify wiring is of
sufficient gauge for load and length of conductor.
Check with local utility supplier for possible
line problems.
