Mark, thanks.
I remembered a trick I learned with computers and just switched the thermostats to an another location, wired exactly the same as it is the same system in the whole house, obviously. One red, one white for heating only. The problem followed the thermostat as it didn't work in the different location, but the one that was working before continued to work in the different location, after a short reset. The refurbished one, further more, would not work in the location that the prior working thermostat had.
With the problem following the newly purchased refurbished thermostat, I made the one-hour drive Best Buy to take back. I'm giving Google one more chance. I ordered another refurbished since one of my previously 3 working thermostats was refurbished as well.
I think was a problem with the Q.C. in this particular unit. We'll see how the incoming refurbished one works out when it arrives in a few days. Thxs for checking in.
