20
PROBABLE CAUSE
• Defective fan limit con-
trol.
• Defective Blower.
• Improper wiring.
• "OFF" setting on fan limit
control is low.
• Defective fan limit.
• Improper wiring.
• Backdraft damper is in the
“Closed” position.
• Screw on squirrel cage is
not tight.
• Balance weights on squir-
rel cage have become dis-
SUGGESTED REMEDY
Check by moving "ON" posi-
tion indicator to temperature
position where the blower
should turn on. If the blower
fails to run, replace the fan
limit.
Contact your supplier for
replacement.
Review wiring diagram. If
wired correctly, seek profes-
sional assistance.
Remove cover on fan limit
and check for the proper set-
ting. The point indicators
should be set at 100° "OFF"
and 150° "ON". DO NOT at-
tempt to adjust the fan limit
by manually adjusting the dial.
Check by moving "ON" or
"OFF" point indicator to a
temperature position where
blower should turn off. If the
blower continues to run, re-
place the fan limit.
Review wiring diagram. If unit
is wired correctly, seek pro-
fessional assistance.
Open backdraft damper.
Check squirrel cage alignment
and position so that it does
not drag on the housing dur-
ing rotation; then tighten the
screw sufficiently to fasten
the squirrel cage securely to
the shaft.
You may attempt to adjust
the weights yourself to obtain
PROBLEM
4. Circulation blower will
not turn on.
5. Circulation blower runs
continuously.
6. Circulation blower vi-
brates during operation.
TROUBLESHOOTING
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