Specifications

11
3002443 04.14
Problem Probable Cause What to do
Fan is making too much noise. Ducting is too small for the volume of
the air.
Resize ducts.
Ducts/Filters are dirty/clogged. Cleanandinspectductsandlters.
Fan inlet or outlet is too close to the
customer.
Relocate duct or fan.
Fan is vibrating and making noise. Damaged during shipping or
installation.
See if blower wheel is damaged or
if motor shaft is bent. Replace if
damaged.
Dirt build-up on blower wheel. Clean wheel.
Fan and air ducts not installed with
vibration dampers.
Install vibration dampers.
Fan is not working Power is off. Switch on power to the fan.
Capacitor is not wired correctly. Rewire connection.
Fan speed control is bad. Bypass fan speed control. If fan now
operates at 100%, replace fan speed
control.
Fan is getting power, but will not
run.
Blower wheel is stuck due to dirt build-
up.
Clean blower wheel.
Fan speed control is set too low. Set fan speed control to highest setting
until fan is up to speed. Then reduce
speed.
Motor bearings have seized. (Refer to
section 1.1 “Use”.)
See that the fan is operating within its
design parameters. Replace the motor.
Motor capacitor has failed. (Refer to
section 1.1 “Use”.)
Please refer to Fig. 12 and insure
that capacitor is connected correctly.
Check amp draw with and without the
capacitor being connected. If amp
draw is the same, replace capacitor.
Fan is overheating and cycling on
and off.
Dirt build-up on blower wheel. Clean blower wheel.
Motor capacitor has failed. (Refer to
section 1.1 “Use”.)
Please refer to note in section above.
Motor windings or bearings are failing.
(Refer to section 1.1 “Use”.)
Check amp draw. If incorrect, replace
blower motor.
6.3 Troubleshooting