Don't Laugh but I live in a 100 year old home with two very old furnaces with Honeywell programmable thermostats that worked great until today. One is still working fine. I am not currently interested in one of the new fuel efficient models. The problem is with the oldest one. The burners are not lighting nor is the blower coming on even when I change the blower from the automatic setting to the constant on position. The blower motor was replaced about 1 year ago. The circuit breaker is on. It is supposed to get very cold this weekend and I need to fix the problem quickly. Where should I start looking?