Here is a thought, if the thermostat is on Auto and the temperature you want is set at say 70 degrees but the ambient temp is less than 70 then the AC would look at that and say, whoa, it is already as cold as you want so you must want heat to warm the room so lets switch over to the furnace. If your propane is on does the furnace then try to come on, you say it goes back to calling for heat.
I don't run mine on Auto but I could sure go and try this to see what happens if that would be of use to you.
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