Okay sorry, my mistake you do have 8 conductor. That makes perfect sense. There are setups where you can run less conductor and the tstat is a type of remote. But I digress...
So what I am curious now is what is energized at the tstat when HP
only is on. I'm betting Y and G (O/B should be energized for cooling). Then when you increase temp, by the 1 degree that brings on the furnace, what is energized then: E, Aux, nothing? Do you know how to use a multimeter to check this?
This should give us a definitive answer whether the tstat has anything to do with bringing on your furnace. BTW this is a good exercise for your tstat upgrade.
Interesting about the BP and LTCO contradictions. But I believe you're seeing your furnace and HP on together more than 30 seconds. Correct? Just curious what are your BP and LTCO set to?
Yeah, I'd want that L wired up. Put that on your list. If we follow that thinking we'd have to ban all Check Engine indicators.
