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22
Two TTimes
Flash PPattern
Begins TTwo ((2)
Minutes AAfter
Condition
Occurs. PPattern
Indicates LLack
of AAir PProving iin
Fan SSection oof
Unit.
Repair.
Is Air-Proving Switch
Stuck Open? Check
Continuity.
Yes
No
Yes
Is Airflow
Switch Binding?
Replace Air-Proving Switch.
No
Is Fan Loose On
Motor Shaft?
Yes
Tighten Fan Blade Set Screw
Is Proper
Voltage Supplied
to Fan Motor?
No
Yes
Defective Motor or
Capacitor. Replace
Motor or Capacitor
Is
Ignition Module
Receiving Proper
Voltage?
No
Defective Ignition Module.
Replace Module.
Yes
Defective Wiring or
Connections to Motor
Repair or Replace
Wiring and Connections
No
Provide Proper Voltage,
Check Electrical Supply,
Circuit Breakers, Etc.
Is
Proper
Voltage Supplied to
Heater?
Yes
No