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We cooked the mother board in our 15 y.o. furnace. Cost about $150 as I recall. There are a bunch of sensors, relays and other mayhem in any "modern" furnace that could cause your symptoms. There is a "trouble code" that is translatable with a chart inside the door of our furnace that tells you which system is non-op - it's a series of flashing led lights.
Since yours is lighting it's not likely the "hot surface ignitor" - another part that dies - usually on the coldest Sunday night of the year... I keep a spare on hand anymore.
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Bone stock 1974 911S Targa.
1972 914/4 Race Car
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