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If you jump R & G fan will run continuously. You need to just jump R & W. How does the furnace behave then?
If you want to do this now then yes.
What are you getting for an LED flash sequence? What is the model number of the unit?
That's the board I need the furnace model not the board
model number? are the LED's lit?
Are the LED's lit? if not do you have the blower compartment door in place so the door panel switch is engaged?
There are 2 LED's on this control board.
That would explain a lot. That switch is not critical. Jumping it out is a good option.
So what are the LED's doing?
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Is the blower running when it does heat?
Sounds like you may have an air intake issue. If it runs fine with the door off and switch jumpered then I would check the air intake pipe for a blockage.
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So it runs fine with the door off?
That has to be an intake air issue. It is starving for air.