[masterdrago]

Our 3791 has the Dometic digital stat and I've never noticed this behavior b4. Over Christmas holidays some of the family resided in the 5r and had to run the heater. I explained the operation and left it with them. The next day, I noticed the rear a/c unit running. When I checked, the stat was set on furnace. Warm air was blowing out of the floor registers and I could only tell that air was also coming out the ceiling registers. It felt the same temperature by hand as the air going in the return. I have to assume the compressor was not running. I turned off the breaker for the two a/c units. I just checked again now and when the stat in the bedroom is set to furnace, the front a/c blower also comes on. We camped last December and February and I did not notice the a/c running when the stat was set on furnace. Are both stats broken or was I too enthralled with the new camper last winter to notice the a/c units running? We were in the wild blue then and the 5r is under a covered building now so maybe I just did not notice. I sure wish I could wire up a home stat for the a/c and heat operations!