18
Symptom
Possible Cause(s)
Corrective Action
Insufficient air flow
1. Blower speed too low
1. Check for correct drives
2. Dampers or registers closed
2. Open
3.
Dirty or clogged filters
3. Clean or replace
4. Leaks in duct work
4. Repair
5. Elbows, cabinet walls, or other
obstructions
5. Correct
6. Belt slippage
6. Adjust or replace
Too much air flow
1. Blower speed too high
1. Check for correct drives
2. Filter(s) not in place
2.
Install filter(s)
Unit fails to operate
1. Blown fuse or open circuit
breaker
1. Replace fuse or reset circuit
breaker
2. Broken fan belt
2. Replace
3. Defective motor and/or
capacitor
3. Replace
Motor overloads or overheats
1. Blower speed too high or motor
horsepower too low
1.
See Specfications for correct
drives and HP
2. System static pressure too low 2. Check static pressure and
correct syst
3. Shorted windings in motor
3. Replace
