Trouble Analysis
Use the tables in this section to assist in identifying the cause or causes of a malfunction in Air Handler operation. The column
header RECOMMENDED ACTION will suggest repair procedures.
Note: These tables are intended as a diagnostic aid only. For detailed repair procedures, contact your local Trane Service
Company.
General
41
Symptom Probable Cause Recommended Action
Bearing noise Poor alignment Loosen bearing setscrews and realign
Inadequate lubrication Grease bearing(s) (Plummer block)
Bearing is excessively hot Overtensioned belts
No lubricant (plummer block type)
Overlubrication
Misaligned bearing
Retension belts
Apply grease
Clean surface of grease and purge
Correct alignment and check that shaft is level
Motor stalls
Low line voltage
Short circuit, phase to earth (open Phase)
Overloaded motor
Check across AC line. Correct voltage if possible
Check line phases and terminal block connection.
Reduce system load, fan driven speed or increase
motor capacity
Motor overheats Motor fan is clogged with dirt preventing
proper ventilation
Overloaded motor
Motor fan damaged
Remove fan cover, clean fan and replace cover
Reduce load or replace with larger motor
Replace motor fan / clean
Excessive vibration Poor pulley alignment
Transport brackets not removed
Overtensioned belts
Fan / unit vibration isolator collapsed
Check pulley alignment
Remove items used for transport only
Retension belts
Replace vibration isolator
Excessive vibrator Misalign drive Align drive
Excessive motor noise Motor mounting bolts loose
Worn motor bearings
Fan rubbing on fan cover
Tighten motor mounting bolts
Replace bearings and seals
Remove interference in motor fan housing
Excessive fan noise Fan rubbing on inlet cone or guard
Worm fan bearings
Loose impeller
Remove item and repair
Replace bearings and seals
Retighten hub
Premature belt wear Incorrect tension or alignment
Dirt or grease on belts
Belts rubbing
Odd belts being fitted
Re-tension and align
Clean belts and pulleys; check for grease leaks
Remove obstruction
Replace with full set
Filter collapsing Blocked with dirt
Air velocity too high
Filter wrong size
Change at advised dirty condition
Check unit running conditions Replace
with filter sizes as supplied from Trane
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