Question about Honeywell Programmable Thermostat Heater

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Installing Honeywell RTH7000 - I have too many wires!

I am replacing a Honeywell dial thermostat from 1995 on a gas fired forced air system with an airconditioning unit attached, with a Honeywell RTH7000 programmable thermostat. The house has two zones and I am only replacing the thermostat on the first floor. When I removed the old thermostat I have 6 wires - R-red, Y-blue, G-green, B-black, W-white, O-brown. The manual does not show where an O wire is connected. The old thermostat has a fan setting for On - Off and Auto on one side and on the other side it is Heat Off Cool. Any help would be appreciated!

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  • MegBarnes Oct 26, 2008

    Thanks, I'll try connecting it that way and see what happens!

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Check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats

Posted on Oct 26, 2008

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Does thermostat have to be on Auto or On to make my heat come on?? Dont know if i have thermostat problem or Furnace problem. Furnace clix on whenever it wants to, doesnt use the schedule i have...


If the thermostat is wired correctly, and matched to the type of heat you have ie electric, heat pump, boiler, forced air, gas or oil, the heat should run in either Fan ON or AUTO. Maybe you can explain your system a little more in depth...furnace type, M#, & thermostat brand w/ M#.

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which colors are they? one should be from the igniter that goes to W on the thermostat and the other goes to Rc just make sure that the one from the igniter goes to W

email me if you need additional help hvac.tech7872pr@gmail.com

here's some additional instructions if you need them:

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2104ES.pdf

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