Our original upstairs CT 100 thermostat failed, so I installed a new one today.
I wired it exactly like the original was wired, and verified that against a picture I took of the original wiring scheme.
I configured the thermostat for a heat pump with auxiliary heat, and all circuit breakers were turned back on after the install.
But the thermostat doesn’t seem to be communicating with the heat pump at all. The thermostat has power and you can work the screen, but inputs at the screen don’t elicit a response from the heat pump. It won’t cool or heat, and the fan won’t turn on.
Any ideas about what’s wrong?