Sorry, I was unclear. The thermostat usually connects to the wall
(whether that's a structural wall, furnace wall, or something else) with
a multi-pronged plug which includes the thermostat power supply. If you
have power to the thermostat power supp...
My Nest Learning Thermostat sometimes has a similar problem. It
sometimes fail to connect to the power lead in the wall jack. What I do:
pull the thermostat out from the wall (plug in the back of the
thermostat disconnects from the jack in the base) ...
