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

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I've tried to install a Honeywell 7500 thermostat. I believe I have it wired correctly. I have Red - R Yellow - Y Orange - O Blue - C Brown - X White - Aux

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  • Joseph Lillie
    Joseph Lillie May 11, 2010

    What is your question? That should be correct

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The colors aren't all that important.  make sure the letters on the thermostat and the letters on the furnace control board have the same wire connected.  that's all you need to do.

Posted on Dec 06, 2008

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1 Answer

How can I make a thermostat connection?


Good morning Yakup.

The best way is to write down how the old t-stat was wired. If that's not available, the only way to determine for certain where each wire goes, is to check what the installer did at the terminals in your home comfort system. Please note the there is high voltage electric in each piece of equipment so if you decide to open up panels, there is always the risk of damaging the equipment or worse, injury or death if you are not a qualified service technician. However, typical color assignments are as follows:
R= (24v from heating appliance) Red
RC= (24v from cooling appliance) Red
These two are only separated when you have two different appliances providing seasonal comfort, like a boiler and an air handler. If you have a warm air furnace with an air conditioner or a heat pump attached then R+RC will have a jumper across them and only one RED wire will be landed there
W= (heat) White
Y= (cool) Yellow
G= (fan) Green
Those colors are pretty standard
The rest of the colors depend on availability in the jacket and are really up to the installer. You mentioned 7 wires but 8 conductors is more likely so I'm assuming the remaining colors are black, brown, blue, and orange.
I always use the following:
C= (common) Black
O/B= (reversing valve for a heat pump) Orange if the valve is energized for heat and Blue if the valve is energized for a/c.
Aux/E= (auxiliary or electric heat) Brown
L= I believe this is a diagnostic terminal for some systems with feedback data and is not used frequently.
After wiring there is some programing to do to set up your new thermostat to your type of system.

Hope that helps. God bless and be careful.

Aug 06, 2014 | Honeywell RTH6350D1000 5/2Day Prog...

1 Answer

Installing a honeywell thermostat with a goodman cpke24-1ab heat pump


r is red c is blue w is white y is yellow g is green o is orange w2 is w2 is also white e is brown but some installers dont follow that pattern so maybe this helps red is 24voltpositive c is 24voltnegative yellow is compressor white or w2 is heat brown is emergency heat orange is reversing valve green is fan

Mar 31, 2013 | Goodman CKL30AR30 Air Conditioner

1 Answer

I am trying to install a Honeywell RTH2300B thermostat. I can't get the wiring. I have a red, blue orange, green, yellow, brown and white wire and B, O, G, Y, W, Not Used, R, and RC terminals. Can


what type of system are you wiring it to???? for general info b and o are used if heat pump system, g =fan (blower), Y =cooling (ac), W=heat, R and rc are 24v feed to stat, do not use rc if system does not have cooling. if it does and 24v is from one source then connect fed to r and install jumper between r and rc . you list wire colors you must identify where they are connected at other end.

Nov 16, 2012 | Heating & Cooling

1 Answer

I installed a Honeywell TH5220d 1029 thermostat on a American Standard AC/Heat pump and the install and setup went fine. It cooles for about and hour and quit. I found the 5 amp fuse at the furnace...


Red wire to R on thermostat red on furnace and red on heat pump Same with white except w1 on thermostat. Blue to common on thermostat common of furnace (probably brown but will be marked) and blue to common on heat pump. yellow to Y on thermostat and straight to heat pump. Orange to O on thermostat and straight to heat pump. If wired correctly with no shorts fuse problem should be solved. commonly people leave enough wire exposed inside the t-stat for wires to short together. This will blow the fuse. Hope this helps. I understand the frustration.

Jun 27, 2010 | Heating & Cooling

1 Answer

I need a wire diagram of a central heat and air with a heat pump


W- White (heat)
Y- Yellow (condenser)
G- Green (Indoor fan)
C- Blue (Common 24v)
R- Red (24VAC)
O/B (Only needed if system is a heat pump)

May 07, 2009 | Honeywell Heating & Cooling

1 Answer

I have a carrier air/heating unit with pump. It has 8 wires. Brown,blue, white, yellow, green, black, orange,and red. I'm trying to install honeywell thermostat. The wires from my unit are suppose to go...


Turn the power off to the air handler. Open the control cover. Write down what color wires go together at the wiring terminal. All 8 wires are probably not used.
Post the findings here.
In most cases,
E= brown-emergency heat
AUX=white-auxillary heat to supplement HP
Y= yellow-to compressor for heat or cool(hp)
G=green-indoor fan
O-orange-reversing valve on HP when energized in COOL
L=t-stat light(probably not used)
R=red-24v incoming power
B=black-reversing valve on HP when energized in HEAT
C=blue-common wire for 24v
Only one of the "O" or "B" will be used. Not both.

Apr 27, 2009 | Carrier Heating & Cooling

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

2 Answers

Heat will not shut off


Take white off of Aux, and attach it to L

Feb 16, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I am replacing a white rodgers thermostat with a honeywell rth3100c. i have matched my wire as e (brown) to e w2 (white) o aux y (yellow) to y g (green) to g o (orange) to o l blank r (red) t r b blank c...


Blue (C) or sometimes (B) should be your common wire. Look at your schematics and locate common. Your Brown wire is (E) and is emergency heat, white wire (W) is Auxilary Heat, green wire (G) is fan relay, red wire (R) is power, yellow wire (Y) is Cooling and orange wire (O) is reversing valve.

Dec 02, 2008 | Heating & Cooling

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