RTH7500 - old thermostat has 8 wires - how do I wire it?
Hello,
I recently purchased an RTH7500 and went to wire it. My old thermostat is a honeywell T7512. I suspect it is from 1994 when the house was built. I can't find anything that will tell me how to wire this... Since I have 8 wires coming out of the wall, and all 8 were connected...
On my old thermostat, I have
E Y O R C G W2 B attached. Any idea how I wire the new one? The guide says if you have O C and B - stop... call a contractor...
I believe I have a heat pump, I do not know if it is multistage/etc.
Thank you!