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Problem Probable Cause Solution
Blower Motor Does
Not Run
Damper limit switch not closed
or inoperative
Repair or replace switch
Motor thermal overloads tripped For tripped condition-reset
Fuses blown or missing Replace
External power source lacking Have incoming power lines checked
Motor inoperative Repair or replace
Blower Motor Runs,
But Fans Do Not
Supply Enough
Make-Up Air
Intake filters dirty Replace or clean
Obstruction in intake
Check dampers for proper operation
Clear all intake passages of obstructions
Fan wheel loose on shaft Reposition and tighten
Access doors and panels not closed Close
Excessive discharge resistance from:
Dirty filters in discharge
External dampers
Clean filters and/or readjust dampers
Excessive Fan Noise
Fan bearing Replace
Fan wheel loose on shaft Reposition and re-tighten
Fan wheel rubbing
Loosen setscrews Reposition cone
and tighten
Fan wheel dirty Clean
Loose duct Tighten or reinforce
Foreign article in fan or duct Remove
Table 13.1: Supply Fan
PR Series Installation, Operation, and Maintenance Manual
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