Hi thanks for the reply, 1. Yes at 6:00 this am the furnace ran and produced heat to 76 deg. When it got to the setting it shut down like always. 20 or so min later I tried to turn it down to 68 to nothing happened. 2 when I press the on/off button nothing changes. 3. I tried the mode nothing, the same with the zone, fan, clock, temp up/down, inside temp and the F/C. It seems to be locked-up.I unplugged it, let it sit for half hr turned off power to coach 120 and 12 v same thing nothing. It’s stuck in furn 76 deg and auto fan and zone 1 for the last 12 hrs. Dan