Quote:
Originally Posted by legion
Weird. My furnace uses a spark to ignite. It has a lead that runs from the flame box to a control module. Much like a spark plug, its surface can become fouled and the expansion/contraction cycles can increase or decrease it's gap from the grounding components to the point it will not ignite.
Christian, I think your first step is to identify what kind of furnace you have.
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Chris maybe has the intermittent pilot type?
http://homerepair.about.com/od/heatingcoolingrepair/ss/furn_electr_ign_3.htm
this is the more common version...
http://homerepair.about.com/od/heatingcoolingrepair/ss/furn_electr_ign_4.htm
this is a good reminder. I need to go buy a spare! those little f'ers go out every few years. good for the hvac business, but a pita for the homeowner.