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

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Connectoin wires for the RCT8100 are different that what's on my current thermostat. What do I do?

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Wire is differentonrct8100 then my current thermostats

Posted on Jan 07, 2010

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Need wiring diagram for Honeywell RCT8100


The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

Apr 02, 2010 | Honeywell Electronic Programmable...

2 Answers

Justgot a honeywell rct8100 thermostats and cant gerthe wireing rigt i only havered and white wire coming out of old thermostat


Hi,
On the new thermostat put the red wire under the Rh terminal and the white wire under the W terminal. If you heat does not work then it is because something else is wrong, not the wiring...

heatman101

Mar 30, 2010 | Honeywell Electronic Programmable...

2 Answers

RED BLUE GREEN WHITE ARE THE FOUR WIRES THAT I HAVE TO CONNECT. PROBLEM IS THAT I FORGOT TO (AND I KNOW BETTER) MARK WHERE EACH CAME FROM TO PUT BACK IN THE RIGHT PLACE -- USED TO HAVE A DEHUMIDIFIER NOT...


On the back of your thermostat, you should have a R (Red), W (White), G (Green), Y (Yellow), and a C (Common). If you have a thermostat that also has a set up for a heat pump, you will have additional terminals, but you don't have to use them since you have a 4 wire, ( in case you do, make sure your thermostat is set up for 1 heat, 1 cool). Your wires are all color coded besides the blue. Red to R, Green to G, and so on. Your Blue wire is being used for Yellow which will go to the Y terminal. Blue is usually meant for a common, but with only having a 4 wire, that's the color that was used. Red is your power, Green is your fan, White is your heat, and Yellow is your A/C. Hope this helps clear some stuff up and good luck!

Mar 12, 2010 | Honeywell Electronic Programmable...

1 Answer

Is there a wiring schematic available for a Honeywell RCT8100


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Feb 10, 2010 | Honeywell Electronic Programmable...

1 Answer

Hi Proper way on wiring furnace.


I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

Jan 06, 2010 | Goodman Heating & Cooling

1 Answer

I have a honeywell RCT8100 and I have a RED, white and black wire and the 8100 has a white yellow and green or ground which is which.


The black wire is usually a common but if you look inside the furnace or heat pump to see what the black wire is connected to in the furnace you would have a good idea where to wire the black wire to. If it is wired to a balck wire in the furnace then it is most likely a common or ground. If it is wire to green it is the green wire on the thermostat.

Jan 03, 2010 | Honeywell Electronic Programmable...

1 Answer

Wiring Trane/Honeywell TH8320U


use the outside designations for heat pump, and inside for standard, I would assume a heat pump since you have more than five wires attached to it now. Use the colors of the wire to match to the designations, use tan for y2, black for w2 rc and rh should already have a factory jumper. I would have to trace out the "U" and see where it terminates, I have not seen a bare wire on a stat in 27 years of doing this. before powering, verify the tan and black at the indoor unit circuit board and see if they are landed on the terminals designated at the stat. hope this helps

Jul 27, 2009 | Heating & Cooling

1 Answer

Dryer cord access


not sure why you wouldbe able to remove the one cord and having an issue connecting the other.
perhaps the old cord had like a y(open end) connectoin point and the new cord has eyelets(closed end)??? if thats the case and the y connectoin was behind hte terminal block( or sandwiched between) by removing the terminal block screw you can mount hte new infront of block, secured by main screw.

Mar 25, 2008 | Dryers

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