26
TROUBLESHOOTING
Fan Service
SYMPTOM
POSSIBLE CAUSE
REMEDY
Fan will not run
Blown fuse or breaker in
disconnect switch.
Replace fuses or reset
breakers.
Main power not turned on
Turn power on at all.
disconnects ahead of the unit.
Defective wiring or loose
connection
Follow wiring diagram and
tighten any loose connections.
Incorrect wire size
See wire size chart for proper
wire size and change if needed
Overload kicked out
Check manual reset, push in to
reset.
Defective motor
Replace motor.
Defective magnetic contactor
Check the magnetic contactor.
Fan runs for a short period of
time then it shuts off
Undersized wiring
Check to see that power supply
wires are the proper size, contact
your local power company.
Low line voltage at the
installation. Power failure.
Call power company after
making sure wire size is
correct.
Magnetic contactor
malfunctioning.
Change magnetic contactor.
Wrong heater strip
Replace with proper heater
strip.
Fan vibrates.
Fan not mounted securely to
mounts.
Mount fan securely
Fan has dirt deposits on blade.
Clean blade.
Motor shaft bent.
Replace motor.
Blade not properly mounted on
shaft.
Mount blade properly on shaft.
Blade out of balance.
Replace or have blade balanced.
Fan makes ticking noise.
Fan blade hitting fan housing
Motor bearing bad
Replace motor bearing.
Stop fan and turn off power.
Remove motor and blade assembly
from the housing.
Check for rub marks on blade and
fan housing.
Adjust motor for proper clearance.