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The c in the furnace that is white is going to your condenser, it must stay. ADD the blue that goes to the tstat OR brown, which ever and then use that color on your new tstat and you will be fine. Always turn power off when changing stat
When you remove the wires from the old t-stat they should go to the same terminals you pulled them from. If R had an orange wire then the orange goes to R on the new t-stat. If that's not a good method, probably due to the style of old t-stat, then you need a tech. In order to wire it properly you will need to know what color wires are connected to what terminals inside the indoor unit. Normally inside the unit there will be R,G,W,Y,C where red-R, w-white, G-green, Y-to yellow or sometimes blue, and c-blue unless blue is used for the y circuit. We can use any color we want when wiring these units so honestly there's no way to give you a good answer. Work safe!!
This is if you have gas furnace and central air conditioning.
Normally this is the way.
Red wire to R (or if your stat has Rc and Rh, wire to both of these
White wire to W
Green wire to G
Yellow wire to Y
Blue wire to C
If you want to check, before you connect to stat. Connect red and white (heat should come on)
the connect red and green (blower should come on) Normally yellow is for air conditioning and Blue is common DO NOT CONNECT ANY WIRE DIRECTLY TO BLUE, if blue is common it would short out fuse
yellow is the cool wire, green is the fan wire, white is the heat wire, red is the power wire. these stats should have a 1 letter icon ,r for red on stat y for yellow and so on ,make sure that Rc and RH are jumpered and install batteris if needed
. 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.
The standard code is red is power or [R] on your t-stat, yellow is cooling or [Y], blue is common or [C], and green is fan or [G]. This is standard across U.S.A. if the installer, installed it correctly. I as a rule of thumb look in the air handler to make sure the colors are correct. I always tell my techs. that elec. doesn't any color and this could you from burning up your t-stat. Plus, while your in the a/h you can make sure your blue common wire is connected. You will need this to run your programmable t-stat. If you are replacing a reg. t-stat then it might not be in use, but without it your running the t-stat on battery back up.
This should be doable: First get pen and paper-start at the furnace, theres a group of 5-8 wires leaving the furnace anfd going to the thermostat and a group of 2-3 going to the condenser outside that all need to be identified and the location in the furnace recorded if your furnace has a control board simply right the letter and the corresponding wire color:and whether it belongs to the condenser grp or the T-stat grp.
Furnace R-red-to t-stat C-yellow to cond Y-red to cond and yellow to t-stat G- green-to t-stat W- white- to t-stat
If you dont have a circuit board youll be doing the same thing but using the components rather than letters;
Transformer 24v- red to t-stat transformer 24v com -yellow to cond Red from cond connected to yellow from t-stat fan relay - green to t-stat gas valve - white to t-stat
K then go to you t-stat and simply connect the corasponding component or leter to the thermostat gterminal
Cond Furnace Thermostat
yellow com- blue -C or B gas valve or w-white -W fan relay or g -green -G trans 24v or R -red - R red connection to cond or Y on board -Y Hope this helps.