Question about Honeywell Programmable Thermostat Heater

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The AC or Heat will not turn off once set temp is reached.

I installed the thermostat 4 wires. There was no Yellow but a blue wire was hooked up to the Y terminal so I am using that. The thermostat turns on both the heater (gas) and the AC(electric) fine. The fan auto/on switch controls the fan fine as well. Any suggestions would be welcome

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The yellow and the blue wire are commonly interchanged. as long as it is hooked up the same at the gas heater. It sounds like you did it right.

Posted on Jun 17, 2008

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Which thermostat to use 4-wire Goodman gas furnace


blue is common. never let that wire touch any other color or you will short the transformer. Use a thermostat for single stage gas heat. R=Red W=White Y=Yellow which should go to the outdoor ac contactor and C=Blue which should also go to the outdoor ac contactor. If in doubt call a qualified Heating contractor to help you install. It can get quite expensive letting the smoke out of your parts.

Aug 21, 2014 | Heating & Cooling

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Hey, I purchased your Honeywell RTH2510 Thermostat, but I didn't even think to label the wires when I took the old thermostat off. Upon installation of the new Thermostat (2510) the Air Conditioning...


The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

Heat Pump Wiring
Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
G- Green- Fan
W- White- Heat (Sometimes W1-W2, first or second stage heat)
Y- Yellow- Cooling (Same applies as above i.e. Y1-Y2)
C- Common (Most people use blue unless it is used for B terminal and sometimes cooling on older 4 wire systems.
B/O- Reversing Valve for heat pump. Either powered heating or powered cooling, depending on system installed.
Aux- Also used for heat.

Note: Considering that the installer had their own way to run all wires, use different wires, connections, etc. This is just a reference to common wiring in the field.

How the most common system is hooked up:
Thermostat:
Red wire goes to R terminal
Yellow wire goes to Y1 or Y2 terminal
Green wire goes to G terminal
White wire usually goes to W1 or W2 terminal
Orange or Black wire goes to B/O terminal
Brown wire usually goes to Aux terminal
Blue wire goes to C terminal, unless its being used as stated above.

This is without using a fossil fuel kit or zone control board.

Where do they go from the thermostat?
Red
goes to the air handler transformer or board and goes outside to heat pump to power low voltage controls.
Yellow wire goes straight outside to Y terminals on heat pump unless going to a board inside first.
Green goes to the air handler fan relay.
Common goes to the air handler and outside to heat pump.
Black or Orange will go outside to heat pump terminals for reversing valve.
White usually goes outside to heat pump,and inside to air handler. Will explain reason further down.
Brown will go to the air handler to the heat relay for the emergency heat.

On a call for heat, with a powered cooling system (more common).
The R, Y, and G terminals energize, sending a signal to start the blower and pull in the contactor outside. Note that the Y terminal is usually cooling, but since this is a powered cooling system, the reversing valve is not energized, causing the system to run in heat mode. If you have powered heating, the reversing valve terminal will energize also. Depending on thermostat, if you set the temp substantially higher than room temp, it may kick on the emergency/aux heat to quickly raise the room temp. On a call for emergency/aux heat, the R, G, and E/Aux terminals are energized, turning on the electric/gas heat instead of the heat pump. This comes in handy since the heat pump can only pull so much heat from outside before its not enough to properly warm the house, usually around 30 degrees outside temp. If you are running the heat pump and the system goes into "defrost", the outside unit will send a signal back to the air handler, through the white wire I mentioned earlier, to tell the emergency/aux heat to come on while it is in defrost mode, providing heat whenever needed.

Again, this is just a reference guide to some basic wiring, but hopefully it will tell you where the problem is or at the least, give you a good start. There are variables in which things can change the wiring like a zoning system or fossil fuel kit. Even then, you should be able to get pretty close. Hope this helps and Happy Holidays!

Dec 07, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

The thermostat (I installed myself) is not working. I have no heat. It's a combination heat/ac. I read instructions. I'm thinking maybe I have a wire connected wrong. before I go any further, I'd like to...


Wiring color to Thermostat Depending on what thermostat youhave and existing wires. Typically red and white are for heat and yellow andgreen are for cooling. On base of thermostat there should be initials stampedto identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most usesyou need to jumper these two together. You may have a blue wire instead ofyellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

Jan 09, 2011 | Heating & Cooling

1 Answer

I have a bryant model 702b packaged unit with 5 wire thermostat wiring coming out of the unit. R Y B G and W. The thermostate in the house is 5 wire and goes to the old central unit and them has a 4 ire...


R-Red is power
Y-Yellow is cool
B-Blue is cool as well
G-Green is fan leg
W-White is usually heat Leg


If you have no indoor unit and this is a ac/gas or
electric outdoor unit try this.

R to R/Red to Red
G-G/Green to Green
Y-Y/Yellow to Yellow
W-W/White to White
-Dont Hook up Blue.

Turn power back on turn the fan to on,fan should run
Turn to Heating, heating should come on
Turn on Cooling,if cooling does not come on switch yellow with blue.

Jul 02, 2010 | Heating & Cooling

1 Answer

Honeywell RTH230B cooling problems...


I printed out the instructions for your thermostat. It looks like you should have the following.

There should be jumper wire between Rh & Rc

Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.

Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.

White wire to W. Powers the heat relay

Yellow wire to Y. Powers the cooling contactor

Green wire to G. Powers the indoor fan relay

There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.

Hope this helps.

May 24, 2010 | Honeywell Electronic Programmable...

1 Answer

New thermostat..have heat but not A/C help....


What are you setting the thermostat to when you turn on the AC , if you turn on the AC and the house is warm you will need to turn the AC down to a lower setting before the the AC will start up.

Mar 14, 2010 | Honeywell Electronic Programmable...

2 Answers

Honeywell RTH230B works on AC not on Heat


check wiring to furnace check wire hook ups on board match letters and colors sometimes installer use what ever wiring they chose on letters

Oct 16, 2009 | Honeywell Electronic Programmable...

1 Answer

Thermostat Wiring Problems!!!


. your blue is probably common and if you hooked it to Y you shorted the transformer or blew the low voltage fuse. Green is fan, yellow is AC, Red is 24volt. Is it a heatpump or just ac? I think its probably a heat pump and your brown is your Reversing valve it needs to be hooked to O on the new stat. If its a heatpump your tstat must be a 2heat 1 cool stat w/ aux heat. Without knowing what terminals the wire were hooked to on the old stat you may have to look at whats hooked up at airhandler( furnace) and on A/C (heatpump) tobe able to determine what goes where on the new one.

Sep 20, 2009 | Heating & Cooling

1 Answer

I have an older Day & Night / Bryant / Carrier downdraft central heater. It was a heat only unit but has an aftermarket AC unit added onto it. I have the latest PCB that adds the AC cooling feature...


4 wire will not work properly.

You will need a 5 wire minimum.

Blue = common
green = blower fan
red = hot
white = furnace
yellow =AC

The wire from the thermostat to the airhandler would be like above.
The wire from the thermostat to the AC (via the airhandler) would be blue and yellow.

Aug 30, 2009 | Heating & Cooling

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