Over the weekend my furnace went off (not out, there is no pilot light) two different times and the temps in my house went below 60F -- brrrr. Too cold for me. It did this back in December as well and I had a guy out the next day to fix it. Well, apparently not. Today another guy came out and explored the inner mysteries of the device and discovered that my control board was not up to date. About a year and a half ago they replaced all the control boards with an updated version. I somehow managed to get an old version in my furnace. Hopefully this will be the last time I need to see the furnace technician (it is a high-end Carrier, 97% efficient, looong warranty) and my fingers and toes stay toasty.