Carrier furnace

I had the same problem of furnace running on and off frequently. I opened the covers of the furnace and replugged the wires after unplugging them... esp the white wire of igniter traced back to it's origin. It was plugged with many wires into a white box. I just took that whire box out and put it back in... I was without heat for almost a month... but its fixed now... I wish if I can upload picture of the box whixh I took out and put back in... may be some loose connection... Njoy and Stay warm.