Okay. I have installed the thermostat and it seems to be working. But. I had 7 wires. White W/E, Red RH, Green G, Black W2, Yellow Y, Blue C and Orange O/B. I wired all but the Black wire. Is this correct? Included a pic of the original wiring. It’s a Westinghouse system
This is going to take a little bit of an explanation. You have a Heat Pump system with a forced air cabinet that has electric heat strips installed it. Your wire attached to the old thermostat W/E is your emergency heat wire. The wire attached to W2 is your auxiliary heat.
You will need a Nest Learning Thermostat in order to support Auxiliary Heat and Emergency Heat with a heat pump. Your wires should be attached as follows:
Rh, Red Wire, goes to Nest Rc
OB, Orange Wire, goes to Nest OB
Y, Yellow Wire, goes to Nest Y1
G, Green Wire, goes to Nest G
WE, White Wire, Goes to Nest *
C, Blue Wire, Goes to Nest C
W1, Black Wire, Goes to Nest W2/AUX.
It should look like this picture I created for you.
AC Cooling Wizard
