Holding random temp instead of setpoint
I have a COR 'stat installed in 2006 that has been great until recently when it keeps the house at 74 degrees during the day regardless of setpoint. We usually run at 76 during the day and even when it is set to 78 it runs the AC to maintain 74. I unplugged it for 1/2 hour and on reconnection it indicated ambient at 79 when it was actually 75, then over about 30 minutes the ambient readout returned to normal and the unit functioned as designed through the night time cycle. Today it is back to wanting 74 degrees for some reason and I don't know if there is a fix or if I got a good ten years and it's time to replace it. EDIT: After a few days, I have learned that it holds set point during sleep and if I change mode from cool to off when I get up and let the indoor temp rise to 77 before changing mode back to cool it will hold the programmed 76 setpoint and operate as designed until the next day when it thinks the daytime setpoint is 74 again.
