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Okay thanks to every one who responded to my problem. So everyone take note because it took some one who has worked installing and repairing carrier systems for several years to figure it out. He...

Checked all of that and thats not it. this is a very unusual situation and hard to figure out. Not a typical trouble call!

Ive replaced the pressure switch and cannot get the furnace to close the pressure switch. any ideas? ive removed the flue and fresh air intake and it did not change any thing.

It seems to have to much negative pressure acording to out digital magnehelic guage. we taken off both the flue and freshair intalke and no change

the venter motor is working and I have replaced the pressure switch

Im having trouble figuring out why this 6 year old furnace wont close the pressure switch?