Troubleshooting; Troubleshooting Guide - Air Blower - Trane GXAA Installation, Operation And Maintenance Manual

Troubleshooting

For troubleshooting of the duct furnace, refer to the Separated Combustion Indoor Gas-Fired
Duct Furnace Installation and Service Manual. For Evaporative Cooler/Cooling Coil equipped
units, refer to these specific manuals for additional troubleshooting guides.
For additional troubleshooting, see following Troubleshooting Guide.
Troubleshooting Guide — Air Blower
Problem
Noise
MUA-SVX006B-EN
Probable Solution
Cause
Blower Wheel
1. Blower Wheel not centered in blower
Hitting Scroll Side
2. Damaged blower housing.
3. Damaged blower wheel.
4. Shaft loose in blower bearing.
5. Blower Wheel loose on shaft.
6. Blower bearing loose in bearing support.
Blower Wheel
1. Cutoff not secure in blower housing.
Hitting Cutoff
2. Cutoff damaged.
3. Cutoff improperly positioned.
Drive
1. Pulley not tight on shaft (motor and/or
2. Belts too loose. Adjust for belt stretching
3. Belts too tight.
4. Belts wrong cross section.
5. Belts not matched in length on multi-belt
6. Variable pitch pulleys not adjusted so each
7. Misaligned pulleys.
8. Belts worn.
9. Motor or motor base loose.
10.Belts oily or dirty
11.Improper drive selection
Bearing
1. Defective bearing.
2. Needs lubrication.
3. Loose on bearing support.
4. Loose on shaft.
5. Seals misaligned.
6. Foreign material in bearing.
7. Worn bearing.
8. Fretting corrosion between inner race and
Shaft Seal Squeal
1. Needs lubrication.
2. Misaligned.
housing.
blower wheel).
after 48 hours of operation.
drive.
pulley has same pitch diameter (multi-belt
drives).
shaft.
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