3 ton Waterfurnace, 1 year old, 300 foot well fed open loop, 4.5 gpm. 2700 SqFt 2 story, slab. Honeywell TH6320R1004 FocusPro Thermostat. System runs almost constantly for heat and is keeping up fine in Stage 1. 30 Deg F outside. Setpoint is 69. All of the sudden, it calls for aux heat. Thermostat is at setpoint at 69. I am using all of the Honeywell default settings for a geo heat pump. What gives?