Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Hooking up honeywell model th8110

I have a red and white wire coming out of the wall. Which terminals do they hook to on the back side of the unit

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Red to "R" white to "W" assuming you have heat only

Posted on Jan 05, 2009

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2 Answers

Wiring with only 2 wires; which terminals to connect?


See RC and RH, RC is for cool, RH is for heat, you wire the red wire to the RH or red terminal ,either one will work actually but we generally switch the hot leg of power, W is the heat circuit


wiring-only-2-wires-terminals-connect-cp4yufdp500qfugpjpa1ch44-2-0.jpg

Dec 12, 2013 | Honeywell Electronic Programmable...

1 Answer

Hi! We have a really old williamson thermostat (not sure about the model but it says t87fi89i 2 8047 [dont know if it's i or 1 either]). We want to replace it with a honeywell t87n east-to-see thermostat....


On most applications for heating the red and white wires are used,however I would check what wires are connected to terminals on old thermostat. These connectons should be labled with initial of wire color,such as R,W,G,Y or Rc. If your green wire is hooked to R or whatever just hook new thermostat up like the old one and you should be ok. Hope this helps. Thanks.

Nov 12, 2010 | Honeywell Electronic Programmable...

1 Answer

Where do i hook up the blue wire coming from my wall to the 6400d unit and i don't have a white wire


Look at the terminal it is connected to on the other end, at the furnace. If it is connected to the C terminal at the furnace connect it to C on the thermostat. If your thermostat is battery powered it may not have a C terminal. If not, insulate the end of the wire with electrical tape and do not use.

Oct 18, 2010 | Honeywell Heaters

1 Answer

I am trying to install a RTH2310 but I do not know where the wires go. Brother in law took old Thermostat off and did not write down where they go. I have a white wire, a red wire and a green wire. Back at...


In most cases, the wires are used as this: Red=Power, White=Heat, Green=Fan/Blower Motor, Yellow=A/C. The other wires, like the one hooked to the yellow will be the condenser wires going outside. The thing I'm not sure on, is that Honeywell Thermostats usually have the terminals marked with R,W,B,G,etc. If it does, then the wires will be as color coded and just hook them back up that way. You can also test to see if those wires are what they are supposed to be by jumping the wires. You can start with red since that is supposed to be your 24v power. Jumper red and green, you should get the blower motor on, jumper the red and white, you should get the heat to come on. Same goes for a/c as explained above. Any other questions, I will be glad to help.

Jan 23, 2010 | Honeywell Focus 6300B 5-2 Days...

1 Answer

I bought a honeywell ct3200 and not sure how to hook it up to a two wire system. The wires coming out wall are black and white


If you just have two wires coming from the wall then attach them to the terminals marked R (may say Rc and or Rh, usually has a jumper installed between the two) and W. Hope this helps

Oct 05, 2009 | Honeywell CT3200 5-2 Day Electronic...

1 Answer

The wires in my honeywell thermostat are unhooked


You can do this yourself it is easy. Take the White wire and connect it to the R terminal then take the Blue and connect it to the Y terminal. For some reason he disconnected the Red which is power I don't know why he would do that and leave you just hanging. ken

Apr 30, 2009 | Honeywell Electronic Programmable...

3 Answers

Need to hook up a honeywell rth2310b with only 2 wires!


In some situations the wall plate has no markings, there are just two terminals hooked up to the control wire for the heater. I just installed this thermostat on my gas fireplace. I connected the black wire to the Rc terminal and the white wire to the W terminal. With the thermostat set to heat it works perfectly. Thanks to johnptaylor for the help!

Jan 26, 2009 | Honeywell Focus 6300B 5-2 Days...

1 Answer

Honeywell thermostat Model CT87N4450 heat works but not air 4 wires coming in red, blue, green, white


I had the same problem and decided to take a chance and call honeywell customer support. I am shocked, they solved my problem! At least in my situation we found that the blue wire ran the compressor. Instead of hooking up to "blue" on the thermostat, we hooked it up to "white." It works wonderfully now.

Jul 02, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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