Furnace is propane. If you look at it, you should see propane line. There is also a 12 vdc lead. Depending on the model, this could be just for the fan or it could also be for electronic ignition.
You don’t say what lights are flashing.
Good luck,
Dennis
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2006 Gulf Stream Friendship G7
350 Cat, Crusier Lift w/ Honda VTX
Blue Ox and 2019 Chevy Blazer RS AWD V6
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