White-Rodgers 1F97-1277 Programmable 1 Heat/1 Cool Thermostat Best Quality

Mine just died and I had to replace it to restore control of my heating system. My blue screen 1F97-1271 is only four years old. Luckily I was home when it failed, because the thermostat failed in the "ON" state, so my furnace would never have shut off until the house burned down. That's a very scary fault mode and I have no intention of trying another one of these thermostats.

The cause of the failure may have been the failure of one of the two AA back-up batteries which I found to be dead. The other battery was fine according to my tester. I haven't had a power outage in the past week, so I don't know why the failure of a back-up battery would cause a problem with the thermostat. If you have one of these 1F97 90 Series Blue thermostats, I suggest that, as a minimum, you plan on changing the batteries annually. Perhaps at the same time you do your smoke detectors.
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