Does anyone know how to convert an old thermostat to a new one?
7 whire harness with colors, Orange (O), Yellow (Y), Black (X2), White (W or U), Red (R), Brown (T), Green (G).

New has S1, S2, RC, R, O/B, Y, G, C

Can you furnish the make and model of each stat? Is this a heat pump system?

Need to know more about your heating cooling system, describe it.

Old Stat is a weathertron (GE ?) 3AAT80A1A1
New one is a Honeywell Pro 8000

I also asked for:


is this a heat pump system?

Need to know more about your heating cooling system, describe it.
Are you telling me the stat is GE? Where did you see GE on the stat?

"Weathertron" is a old brand name of Trane equipment. If you have a Trane system you may need to contact a Trane dealer to find the correct stat. Also sounds as if you have a heat pump system, I asked but still not sure what you have. A heat pump system will have auxiliary electric heat that must be controlled also along with the compressor, important to know which control wires are for what.

Pro 8000 is a Honeywell series, and not the model number.

Big problem here! I just removed my old thermostat that goes from 45 to 75 let me remind you that this is a wall mounted heater ONLY. I just want to upgrade to my new FREE Trane z-wave electric thermostat and the new one says to hook up like 5-6 colors and when I took the old one off the wall all I have is 2 white wires and 2 black wires and they are so thick now what do I do in order for me to get this new thermostat work? PLEASE HELP