I'm having a problem with my furnace that I hope someone can shed some light on. The furnace will run and then usually get to the desired temperature set by the T-stat and stop. Then when the T-stat thinks it should run again the the T-stat will show that the furnace is running (it's an electronic T-stat), but the furance will not kick on. If I am near the furnace, I can only hear a real faint buzzing sound (which goes away if I shut the power off to the furnace). If I either turn the T-stat off and on a few times or turn the power to the furnace off and then on, the furnace will usually kick on (until the next go around).
It seems to be a furance issue and not a T-stat issue, but I'm looking for some help. Unless it is something really easy to fix, I plan on calling a repairman, but I would still like to be knowledgable of the problem beforehand.
It is a forced air Lennox furnce about 18 years old. I will mention too that it started doing this a couple of days ago soon after I used the electrical outlet on the furnace to power a shop vac (I rarely use this outlet -- and I don't know if this would be related anyway).
Thanks.
Jim