I am upgrading my old cheap mercury thermostat with a Honeywell programmable model - RTH6300B (a 5-2). When I removed the old unit there were two wires - black & white (labelled B and W). The new unit has 6 connections - C,G,W,Y,R & Rc. There are a number of alternate letters given: C - X or...

I just purchase a new Honeywell RTH4300B programmable thermostat for my oil furnace. My old thermostat was a White-Rodgers and was connected with 2 wires; one red and one black. There was no coding on the terminals and everywhere I look they are always talking about a red and a whir wire. I think I...

Im having a problem installing my new programmable thermostat. The connected wires on the old mercury one are Y, Rc, W, B, G. The ones on the new one are G, Rc, Rh, Y/O, W/B, Y1 and I can't figure out where to put them off the diagram that they sent in the package.

We have moved into a home that had no furnace, and we are installing a carrier brand furnace, and have a programmable thermostat to install. We have had this thermostat for a while, so I have lost the installation instructions. Every thing I have found on the net say to label the wires when...

I have a 10 year old Carrier thermostat and want to install a new programmable thermostat. The thermostat has 5 wires (red, yellow, green, blue and white). All of the programmable thermostats only instruct you on how to install with 3 or 4 wires. Does anyone have a suggestion on a...