been and bald, you guys are funny on this subject matter
personally i think in dual fuel mode (8000) the aux comes on if temp keeps dropping in dual fuel application!
at this point i may not beleive honeywell tech support
i got an 8000 running my 18seer with od stat i will test it myself after baldie tells us what honeywell says!
So you could just walk over and disable the lock out. Set the stat up 2 or so degrees above room temp and test it. But you won't.???
doesn the aux heat also come on when hp is in defrost? also i don't think you need od sensor, isn't their a setting where if the tstat sees the house temp. dropping while the comp. is running, it will switch over to fossil fuel? or did someone already say that