-42 below and the furnace quit

Dam coldest day of the year and the furnace quit.
The wind chill is sitting at -42c below.
got ahold of a heating and pluming company and because it is after hours, he said $240/hr.
since im going to get it up the wa-zoo i might as well go take a dump before he gets here, ... jezzz

if the igniter has gone the safety valve doesnt release and the gas doesnt flow........or, the heat sensor has gone and the warm air is not being distributed?

crank the tstat to max heat......does the furnance light?

Plugged up with cigar smoke?

The air intake was plugged with frost $275 #@$&

We have the opposite problem down here in Florida Brad. Air conditioners fail when the drain line gets clogged with "glop" and algae. I own some rental properties; I've learned how to tape the hose from a wet/dry vac to the drain line to suck out the crap and make the air conditioner work on the cheap. Most of us down here don't have heat- We have heat pumps that are basically an air conditioner that can work in reverse. This works fine in my house down to about 7 degrees C/ 45 degrees F, which happens about two nights per year.

Good luck!

N