Troubleshooting
Problem: Circulation blower runs constantly.
Possible Causes:
Remedies:
• Review wiring diagram. If unit is wired correctly, seek professional
assistance.
• Open backdraft damper.
• Improper wiring.
• Backdraft damper is in the
“closed” position.
1.
Problem: Circulation blower vibrates during operation.
• Screw on squirrel cage is not
tight.
• Check squirrel cage alignment and position so that it does not drag
on the housing during rotation, then tighten the screw sufficiently to
fasten the squirrel cage securely to the shaft.
Possible Causes:
Remedies:
• Balance weights on squirrel cage
have become dislocated.
• You may attempt to adjust the weights yourself to obtain an
acceptable balance. If you are unsuccessful, contact your supplier.
• Return the blower to your supplier for replacement.
• Defective main bearings.
2.
3.
18
Problem: Circulation blower will not turn on.
• Defective fan Thermo-Disc switch.
• If the blower fails to run, replace the fan Thermo-Disc switch.
Possible Causes:
Remedies:
• Defective motor.
• Contact your supplier for replacement.
• Review wiring diagram. If wired correctly, seek professional
assistance.
• Improper wiring.
• Defective capacitor (makes
humming noise without engaging
motor.)
• Replace capacitor.
Summary of Contents for SF2400
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