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Sounds very likely that ductwork is damaged or loose if you can hear the unit running and burning fuel, but get no air flow at vents.
If you turn to AC or just fan, do you get any air flow then?
OK if you get air through ducts in ac mode, we should get air in heat mode.If blower does not come on in heat mode burners should shut down and give us a limit error code.Is that happening?