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good evening, I am Kevin from Ja.......
can I get the model # ***** your furnace?
do you have a heat pump or electric heat?
you could have a defective contactor or relay. the coil could be shorted causing the blown fuse.
first thing I would do is shut off power to electric heat, pull both wires off coil and check the coil with ohm meter from coil to ground, if you have any continuity, replace the contactor.
I know this is probably NOT what you want to do, but try it on AC, It could be the contactor out in the condensing unit for the compressor. If it works in AC, that is probably not the case.