Furnace won't kick on

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ihave a coleman furnace model# 7975-856
serial# 078768098

i just replaced the burner assy (the old one was broken and the pilot light was bounceing around in there and wouldnt stay lit, but furnace would fire up when it was lit). now the pilot stays lit like a champ, but furnace wont fire up? did i do something wrong? how do i troubleshoot what is wrong?

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I figured it out already. there is a wall switch in the adjacent room that controls the blower. I never knew what that switch controled and have forgotten it. why it is there i may never know. But thanks again, this is a great forum!!!!!!!!