The fan stays on no problem
You have a dirty flame sensor. turn the power off to the furnace. you will find a "single" wire under the burners connected to a porcelain base. unplug the wire. use a 1/4" nut driver. remove the screw holding in the sensor. gently pull out the sensor. clean the metal rod on the end with a fine grit sandpaper or fine steel wool. reinstall the sensor. turn the power back on. this should restore your heat
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