Well, finally took the coach in
Thanks to Les,Haffie and Gary!
The thought is as follows ( and something I forgot to tell you guys) My fault
For the past year, the heater motor has been squeeling at startup, but after bearings (?) warm up would run just fine.
Then it just died a few weeks ago.
Took to RV techs, and they said either:
The motor finally died in the furnace and needs to be replaced
or the fuse has burned out.
When I get a definitative answer will let you guys know