If you swapped the suspect 2-wire non-programmable with the known good 2-wire programmable from the bathroom and it works properly, there is no other conclusion. The 2-wire non-programmable is broken.

The ease of manually controlling the thermostat's temperature set-point, heating/cooling schedule, home/away and vacation features - when they are available. The Orbit Clear Comfort 83521 is part of ...

An evaluation based on the smart features and functions associated with thermostats. Considers things like messaging, reporting, features controlled remotely via a mobile device, occupancy sensing and ...