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What is the make of the thermostat? Are you plugged into shore power? Have you used it on A/C and just not on heat since you installed it? The more information you can provided the better here.
See the attached link and tell me if this is your thermostat? http://www.atwoodmobile.com/manuals/ac/MPD_15078_AC_IOM_DUCTED_%2012_03_2014_Rev_8.pdf
Did you look at the link I gave you? See if that is your thermostat........I am in the middle of dinner, so give me 20 minutes or so. Thanks!
So you decided not to hook up the LP furnace? You are just trying to get the heat pump to work here?
Did you press the furnace button to disable that portion so that it works on heat pump only? What setting do you have the fan on? You don't need to take the LP furnace out.........just disable it per the furnace mode setting.
Scroll down through it to the instructions for settings. Have the fan set on "Auto" here. See pages 13 and 14.
Even with the LP furnace not connected I think you have to select the correct mode on the furnace switch so it isn't the primary heating source.
You are welcome, Jeff............thanks for giving us a "shout" here at Just Answer!
I happened to see under trouble shooting that IF the ambient temps are under 45 degrees inside, the furnace mode HAS to be on and used. So you might want to reconsider hooking that up. I can tell you that it is a better source of heat as well.