Where is the ice house? Some of them limit switches you can reset. If the furnace just blows cold air thats a fail safe built into the circut board in case of a malfuction in the gas valve stuck or limit switches poped. You’ll need a volt meter and a wiring diagram and start checking power. The video that fishing star posted is a good starting point…
It’s at our shack up near Orr. The furnace blows zero air. It doesn’t even turn on.