attwood furnace motors fail to start

No air flow may be a stuck sail switch, obstruction in inlet air duct, failed fan motor. Is there a separate on board fuse or in the fan wiring? I would make sure you're working with a set of fully charged batteries, initially.

If the furnaces have made three attempts to start, it may be necessary to reset them. There are different ways to reset, depending on model of furnace. Can you find the Model # and post it up. If you're lucky, one of the furnace experts on the Forum will log in and lead you through the diagnosis and repair. I'm not that guy.

No power to the furnace
Thermostat not sending message to start the furnace.
I am guessing that the thermostat needs to be reset. What make and model of thermostat and does it control the AC units as well?

thermostat is ICM controls AM7812. it controls 2 ac as well the furnaces in 2 zones

The furnaces are atwood 8531-iv dclp 30k btu

I didn't find much information on your thermostat.
I would suggest you try to reset it.
Turn system to off
Remove cover
There should be a fuse (on many anyway) Remove it for a minute or two
Re-install fuse and let system think for a while, maybe 5-10 minutes, Short cup of coffee will do.
Start system and see if it comes alive.