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

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Can't get thermostat to work

Have a honeywell2520 7 day progammable thermostat it only has 5 term. i have 6 wires coming out of the wall 1 green,1 red,two black and two white can't figure it out what wires go where

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Do you have an a/c. you need to go to the furnace and find ware the t-stat connection is the connections will be R= power, w = Heat, G = fan, Y = cool, C or X = common, you will connect the same wires that connect to the furnace to the connections R G Y W C on your tstat. for the 2 black and 2 red i would turn off the power to the furnace twist one black and one red together then take a continuity test between the reds and blacks that will tell you witch ic witch.

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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1 Answer

I have 2 wires coming from the wall, 1 white and 1 blue and want to wire a new honeywell 5-1-1 day programmable thermostat.


likely one wire to TH, the other to W if the thermostat operates on batteries. If the thermostat requires a 24 volt power source it is not compatible with your system.

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I have only 2 wires coming from the wall. Which terminals do I connect to?


Are you replacing an older thermostat?

If so, you'll need extra cabling. Because of the danger this can cause, this should be carried out by a competent person, usually an electrician.

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We just bought a house that the thermostat had been removed and the wires were just coming out of the wall not labeled. The furnace is a Tempstar gas model 9MPT125L20A serial # LO13778617.As far as we can...


The Red and White wires coming from the furnace are the only ones that call for heat. the Green wire turns on the fan continuously, the yellow is for AC. If you have another wire color, it may be a Common wire and should not be used if your t-Stat has batteries. If no batteries, it goes to the C screw.

Sep 29, 2009 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

I just bought a repo house and there is no identification on the wires coming out of the wall for the thermostat. I have a red, green, white, and blue wire coming out of the wall. I need to know where to...


The best way is to see where the wires are connected at the furnace and duplicate them at the thermostat but typically the connections are:
Red wire to "RC and RH"
White wire to "W" (for heating)
Blue wire to "Y" (if you have central air)
Green wire to "G" (this is for the furnace blower)

Aug 27, 2009 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

Hi I am replacing a trane thermostat it has 8


call hunter fan co. you will have to jump out some term.

Jul 01, 2009 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

Switch a rheem thermostat to a hunter thermostat for heat pump


You can take the front cover off of your programmable thermostat. Unscrew approximately 2 screws that attach the base plate of the thermostat to the wall. Look in the back of the base plate after removing it from the wall to see how the 2 or 3 different colored wires (ex: red, green, black) are hooked up. Make note of this. Remove the wires from the back of the base plate and attach the wires to the same posts that they were connected to on the original base plate you removed. I believe the posts on the back of the base plates are color coded. (Ex: attach green wire to where it says GRN on back of base plate).
Make sure the thermostat that you are replacing and the new thermostat are similiar in shape, otherwise you will have make repairs to cover up a space that may appear around the new thermostat.

Good luck!

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2 Answers

Wiring on a RCA RJ-45 wall jack


the RJ45 wallplate is not meant for ethernet. It's an 8P8C connector for a phone. Will it work as a network jack? Maybe. I wouldn't use it, but if you really want to try, wire it thusly:

1 Blue --- Orange/White
2 Orange --- Orange
3 Black --- Green/White
4 Red --- Blue
5 Green --- Blue/White
6 Yellow --- Green
7 Brown --- Brown/White
8 White --- Brown

I'd still recommend a CAT5 wallplate with a CAT5 jack.

Apr 11, 2009 | Computers & Internet

1 Answer

Rewire an old 2 wire thermostat to a honeywell 5-1-1 programmable


I connected the blue wire to the R and the white wire to the W on the old thermostat and shoved the new Honeywell 5-1-1 Day programmable thermostat up the first guys *** that i ran into at Canadian Tire

Thanks for your help

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1 Answer

Ethernet cable


568-B Wiring
Pair Wires RJ-45 pins
1-White/Blue White/Blue 5
Blue/White 4
2-Wht./Orange White/Orange 1
Orange White 2
3-White/Green White/Green 3
Green/White 6
4-White/Brown White/Brown 7
Brown/White 8
568-A Wiring
1-White/Blue White/Blue 5
Blue/White 4
2-White/Green White/Green 1
Green/White 2
3-White/Orange White/Orange 3
Orange/White 6
4-White/Brown White/Brown 7
Brown/White 8
RJ-45 Pins are with the spring tab down and read left to right. Do you have an RJ-45 Crimping tool?
Just use 568-B or 568-A on both ends of the same cable.

Jul 05, 2008 | Computers & Internet

3 Answers

Wall gas furnace


look inside the control panel of the heater. look for a 120 volt to 24 volt transformer.  There may be a fuse on the transformer secondary.  The thermostat switches a hot 24 volt wire so you won't find a common at the thermostat.

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