Hi,
Without knowing exactly what brand and model number your furnace is I will take a shot at this.. If you have a condensing furnace which I think you probably have, and the temperatures got below freezing where the furnace was then you have condensate frozen inside the furnace.
This frozen condensate will keep the inducer fan pressure switch from making and allowing the furnace to start. Had this problem just last year at a camp in a building that they did not always use and turned the furnace off.
To get it working the easiest thing to do is set a little electric heater in the return plenum under the furnace and let the heat slowly thaw the small passage ways that are frozen in the furnace.
It may take at least a few hours till you can get everything thawed enough to turn it on.
The other simple explanation is that the pressure switch is simply so cold that the diaphram is too stiff to work... a heat gun or hair dryer on that will help that out. The pressure switch in usually 2-3 inches around and silver in color with a small hose or two attached to it.
I hope that this will help you to solve your problem!
Thanks for using Fixya!!
Heatman101
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We'll see. But it makes sense in this situation. I am woking on heating the area described. Thanks. Who would have thought a furnace would freeze! Isn't that what the furnace is supposed to prevent!
Bruce
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