I am having an issue with a 8 month old installation of a York Affinity 18 SEER 2-stage heat pump with an Affinity gas furnace and Communicating control. It seems that the backup heat is not being staged on at the 35* balance point and running for over 3 hours causing a "pipe freeze protection" fault. I was told by one York tech rep that the thermostat settings override the heat pump jumper settings, and told that they do not by another rep. All in all those guys are not helpful literally 95% of the time. So the low temp cutout is whats designed to completely shut off the heat pump from what I'm told, and there has to be a 10* difference in setting between the low temp cutout and the balance point. So what is the damn difference between the two? It feels like I should just set the low temp cutout to 35* and ignore the balance point.