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Yes
Yes
Yes
Three Times
Indicates Lack of
Air Proving in Fan
Section of Unit.
Is
Proper Voltage
Being Supplied to
Motor
Relay?
Is Fan Wheel
Binding?
Yes
No
Yes
Repair or Replace
Yes
Tighten Fan Wheel Set Screw(s) to
Flats of Motor Shaft.
Defective Motor or Capacitor.
Replace Motor or Capacitor.
Check Wiring and Electrical
Connections to Motor Relay.
Repair or Replace as Necessary.
Check Wiring Between Control
Module and Motor Relay. Repair
as Necessary. If Wiring is Good,
Replace Ignition control Module.
Replace Motor Relay.
No
Is Fan Wheel
Loose On Motor
Shaft?
No
Is
Proper Voltage
Supplied to Fan
Motor?
No
No
Is Air-
Proving Switch
Stuck Open or
Shorted? (Perform
Continuity
Check.)
Is
Ignition Control
Module Sending 24
Volts to Motor
Relay?
No
Replace Air-Proving
Switch Assembly.
Repair.
Yes
Is Air Proving
Switch Arm
Binding?
No
24