Furnace is not working :-(

[The Codfather]

Ill pm you my number.
First I would do a hard reset on the module, there should be a power switch near your furnace. Just shut it off and turn it back on. This should reset the module, and the furnace will start through a cycle.
If a safety switch was tripped it will try to fire again, if the manual reset switch was tripped(flame rollout switch) it will have to be manually reset, this off course is telling you a bigger problem though. I would watch the furnace, just to get the temp up in the house but would definitely call someone in if this happened, as there is a problem that has to be solved.
Make of furnace and age will help me as well.
Furnace should go through a pre-purge from anywhere from 30-90 secs before trying to fire.
It may be something as easy as the door has vibrated loose and it cut the power to the gas valve.
On newer furnaces there is a troubleshooting led light that will flash the problem, might be worth a look as well.