Hi, I am replacing an old T8085a 1004 with a new rth221. There are 4 colored wires from the old thero, colored red, white, green and blue. They were wired Red --> R, White --> W, Green and Blue --> to 2 separate C. Can someone please advise how they would relate on the new RTH221 thermo. There are...

I'm replacing a Honeywell T8575D2003 with a Honeywell RTH8500. Didn't think there would be issues, manuals are all straight forward. However when I removed the T8575, the wiring set up did not match what the RTH8500 was expecting. The T8575 has 8 wires connected as follows < 1 ...

Hello everyone, I am new here. I found this site which trying to troubleshoot my problem. Any assistance would be GREATLY appreciated. Basically I have an older honeywell programmable thermostat with 7 wires attached. They are as follows... C - Black wire L - Blue wire R- Red wire W2 - brown...

I need help getting my new, programmable thermostat to work. I currently have a dual-stage Heat Pump and A/C unit that works fine. The current thermostat is the Honeywell T8411R. I don't know the number for the subbase, but it's the one that came with the thermostat. The current (operational)...