On a recent trip out west we hit some pretty cold weather in Tucson, so we were running both furnaces and both heat pumps. Wife noticed that the front was getting pretty warm, so I checked the read-out on the control station. The front temp sensor said 48! I shut down the heat pump and the sensor jumped up to 75. Turned on the heat pump and it went back down to 48!
Over the next couple of days, I monitored what was running against the sensor. The sensor would occasionally drop to 40's or 50's, but at other times showed 70 or so (as appropriate). I noticed the sensor is next to a air return duct up front. Usually the temp reading worked right when running only the gas furnace, but even then it flaked once or twice. The back systems and sensor were rock steady.
What do you think? Just a bad sensor? Kind of important, as there is no way to manually override the furnace or air conditioning settings.
Niel & Carol Powers
Tiffin Allegro RED 33aa