Thank you guys for the manual and suggestions. All of the required tests seemed a bit too complex and I didn't want to do all of that if I didn't have to.
So, I methodically thought about every step of the installation to see if I could come up with an error (because it happens a lot)!
And it occurred to me that I had difficulty getting the squirrel cage back on..... could it be installed wrong? Yes, it can with some persuasion! And it was.
Now that it's installed correctly the air flow kicks the sail switch on and the furnace blows hot. The only thing that would have tipped an experienced tech off is how quiet the fan was inside.