
FORM: QM1070
Rev.3, February 2010
Page 12 of 15
Munters Corporation
4215 Legion Dr. Mason, MI 48854-1036 USA
(517) 676-7070 Fax (517) 676-7078
www.munters.us/aerotech
TROUBLE SHOOTING
Fan Operating-
Insufficient
Airflow
Excessive Fan
Vibration
Excessive Fan
Noise
1. Fan control set above room
temperature
2. Blown fuse or open circuit breaker
3. Propeller blade contacting fan
housing
4. Fan control defective
5. Motor defective
1. Variable speed control improperly
adjusted
2. Shutter jammed
1. Variable speed control idle speed
set to low
2. Variable speed control defective
3. Propeller blade contacting fan panel
4. Motor bearing defective
1. Motor loose in mount
2. Propeller damaged
3. Motor shaft bent
Set to a lower temperature
Replace fuse or reset breaker
Realign motor in fan housing
Repair or replace control
Repair or replace motor
See Operation, Step 2 for
adjustment guidelines
Clean shutter & fan housing
Clean guard
Increase idle speed setting
Repair or replace control
Realign motor in fan housing
Repair or replace motor
Tighten fasteners
Replace propeller
Repair or replace motor
Fan Not Operating
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
3. Guard dirty
WARNING
!
High Voltage,
disconnect power
before servicing.
WARNING
!
Moving parts,
disconnect power
before servicing.
Fan never turns off
1. Override thermostat set
incorrectly
2. Control set for continuous
operation
Set to the correct temperature
Set speed control correctly