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Wires don't match the new thermostat posts. The wires from the furnace are Red,Blue black and white The posts in new thermostat are B O G Y not used R and Rc Can't figure which to put

Bryant 340 Mav and RHT111 Honeywell thermostat. Just starting not sure where the Blue goes in the thermostat

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The wire colors are for the following functions ......red - 24 volts white - heat yellow - AC green/blue - blower (fan) red is connected to the R with a jumper between R and Rc What type of furnace/heat do you have ???? Electric. oil, gas .Forced hot air, baseboard, steam, heat pump, or ?????? Different systems use different connections and need a specific thermostat for that application !!!

Posted on Dec 18, 2014

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SOURCE: My we Honeywell RTH6450 thermostat does not have

Here's the colour of wires someone else used

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Posted on Nov 26, 2013

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Thermostat wiring on carrier furnace.How to??


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We just upgraded our thermostat to a Honeywell RTH2310. Our old wires were blue, black, orange, green, yellow, white and red. The new one used all but the blue, black, and orange. Every wire is in it's...


Kasie,
It sounds like you need to find "common". This may be a "c" on the thermostat. What you will need to do is look at the blower unit or the furnace, whichever you may have. All those wires should be connected in the blower (furnace). You need to find which one of those wires; blue, black or orange is wired to "c" in the blower. For example, if you see that the blue is wired to "c" in the blower, it needs to be wired to "c" on the thermostat. It sounds like by your wire colors you have a heat pump, so this makes it a little difficult to figure out because evidently you don't have one. I hope this helps. Just email me back if you have questions Mark

Aug 01, 2011 | Heating & Cooling

1 Answer

We are trying to install a HoneyWell programmable thermostat (model RTH6350) and the colors do not match up. We have an orange wire, blue wire and white wire without a connection. It says to wrap the O,...


T-stat wiring is commonly connected with the following color codes:

On a straight heat and cool system:
White = W on T-Stat
Yellow = Y on T-stat
Green = G on T-stat
Red = R on T-stat

On heat pump systems:
Blue = W2 on T-stat

There is no guarantee that your system is wired using this system so you will need to look in the furnace and see where the wires are connected to. You will have another set, probably 2 wires, going to your outside A/C unit. They are typically red and white but could be any color as long as they are hooked up to the same connections. I.E. blue on R at t-stat and to R on furnace would be OK, it just makes it harder to service the unit if you don't know what wire is for what.

Just check your furnace connections and connect the same wires to your t-stat no matter their colors.

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1 Answer

I put a new thermistat o a/c heat but only the fan is turning on the colors where white yellow red blue I did not put the blue on the O/b screw


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Normally the installer would do red - R, White - W, Yellow - G, and Blue - C.
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I have a Rheem Gas Furnace with an old analog thermostat (Wires conneected to terminals R and 4 for the thermostat). I went to install a Rheem digital and programmable thermostat and it indicated that it...


if you have 2 wire at thermostat Terminals at furnace that the thermostat wire attach to should be R & W if your new thermostat has R & W terminals is should work, an easy thing to remember is the red wire on R the white wire on W. If 4 wire at thermostat at furnace green on G, Blue on Y, red on R,and white on W same at thermostat If these do not match find a thermostat with these terminals

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1 Answer

I am tying to install an RTH6400 5 in 1 thermostat but the colors of wires i have on my wall are RED, GREEN, BLUE AND BLACK, where as the book has RED , YELLOW,WHITE AND BLUE. please which do i connect to...


You need to open up the panel at your furnace(air handler) and find the terminal strip and see what your existing thermostat wires are connected to. Normally your red wire connects to the R terminal(24 volts), the yellow wire to the Y1 terminal(cooling), the white wire to the W1 terminal(heating), the green wire to the G terminal(indoor fan). You can use whatever color of wire you have existing, just make sure that the R,W1,Y1,and G wires at the furnace match the R,W1,Y1, and G terminal screws at the thermostat. Also make sure the power to the furnace(air handler) is turned off before you make any wiring connections at the thermostat or furnace.This is very important! If you don't and you short any wires to ground(especially the R wire) you will possibly ruin the system step down transformer or blow the low voltage fuse.

Nov 10, 2009 | Honeywell Electronic Programmable...

1 Answer

Installing thermostat - extra wire?


you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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I need to know how to rewire my heil air conditioner 6 wires are lose?? they are red white orange black red and purple!!!! Model number ph5036akb4


the wires at the thermostat????...this can be very tricky because the colors could mean nothing...every installer can wire it differently...if they used one continuous thermostat wire it's not too bad....you have to go down to your furnace and look in the fan compartment or wherever the thermostat wires enter the furnasce....generally a brown wire with 5 wires colored inside....find the wires where they connect to the furnace circuit board , terminal strip or fan centre and write down all wires and their corresponding terminals...for example...Red wire is on "R"white wire is on "W" and they may not match their color....thats ok.....then connect them at the thermostat accordingly////if you only have 4 wires you will require the jumper wire between RH & RC ...if you have 5 wires...remove the jumper or ignore that....good luck :)
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1 Answer

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the normal wiring for stats is white=w=heat,red=r=24volts,green=g=fan,blue=c=common,yellow=y=cooling.
see what ties into your furnace board and match the terminals.

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