Did you check the fuse in the thermostat? I think there is a 5 amp fuse behind the cover of the thermostat.
Does the stove have gas? Turn the stove on and see if it will light. If not you might have a problem with the regulator on the propane tank. Tiffin has had some problems with the factory installed ones. Or you could have the same problem I had and the valve wasn't turned back on when I had the tank filled.
What is the temperature outside? The heat pump will only work if the temp is over 40 degrees.
Jon & Sue Francis (Retired U.S.A.F.)
Lil Girl-Rescued, Abby Rescued, Peaches Rescued
06 Allegro 35TSA Workhorse Chassis
2013 Chevy Spark Dinghy