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© Munters Corporation, January 2020
QM1041r5
Troubleshooting
6.
6.1 Troubleshooting
WARNING
!
High Voltage, disconnect
power before servicing.
WARNING
!
Moving parts, disconnect
power before servicing.
Fan Operating-
Insuf
fi
cient
Air
fl
ow
Excessive
Vibration
Excessive 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
1. Variable speed control improperly
adjusted
2. Shutter jammed or dirty
3. Guard dirty
1. Propeller blade contacting fan housing
2. Motor bearing or shaft bearing defective
3. Frequency drive improperly adjusted
1. Motor loose on mount
2. Propeller damaged
3. Motor shaft bent
1. Set to a lower temperature
2. Replace fuse or reset breaker
3. Realign motor in fan housing
4. Repair or replace control
5. Repair or replace motor
1. See Operation, Step 2 for adjustment guidelines
2. Unjam and clean shutter
3. Clean guard
1. Sand fan housing to remove high spot
2. Repair or replace motor or shaft bearings
3. See operation, Step 2 for adjustments guidelines
1. Tighten fasteners
2. Replace propeller
3. Repair or replace motor
Fan Not Operating
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Fan never turns off
1. Override thermostat set incorrectly
2. Control set for continuous operation
1. Set to the correct temperature
2. Set speed control correctly
