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Since the furnace actually fires off the Sail Switch ISNT what is causing your issue.. the furnace will not have ignition nor will the gas valve open if sail switch doesn’t make contact when blown closed to complete the circuit...
I’d suspect the flame sensor is not seeing the flame correctly due to dirt, mud daubers, or improperly positioned flame sensor/igniter.
The flame sensor is what tells the furnace control module “I see a flame” and tells gas solenoid valve to stay open...
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