No power to RV Furnace or Thermostat

Furnace normally gets it's power from the house fuse box.. Then, at least on an Atwood, it goes to a circuit breaker (looks like an on-off toggle switch) that is on top of the blower housing accessible from OUTSIDE the RV (remove the cover) From there via a MOLEX connector to the control board and from there via a different pin to the thermostat, So if there is no power to the furnace, there is no power to the thermostat.

NOW.. Normally a bad control board would be suspect. but as I recall. not in this case but the switch/breaker is.. Check for power on the control board.