Mistakes made when hooking up a thermostat Avoid them watch

Often when installing a thermostat people have no or little idea of what to do. Thermostatscan be a little tricky BUT this is a pretty good plain answer what each terminal does on the back plate where you hook your control voltage wires.

[@maryjanemoore7261]

Great info! The “main” speaker obviously knows what he’s talking about! The camera guy really should be quiet and let the speaker finish. He’s rushing him. Switch places if you need to, but don’t talk on top of the speaker.

[@ema8909]

Aw. :/ His questions clarified a lot for me while watching. I appreciated it.

[@koningklootzak7788]

It's not bad enough for you to complain. So you be quiet.

[@Keifsanderson]

Thanks. This was a basic but clear and helpful video. I was swapping thermostats and the connections on the two were not the same, and this helped me get it correct.

[@unkhammunankh7252]

Excellent video! Definitely gave me a greater understanding on how the basic wiring of the system works as I prepare to embark on a diy thermostat replacement adventure. Thank you, guys!

[@Environc]

Unkhammun Ankh Your welcome and thanks for your very kind comments!

[@fly4fun24]

for the first time I understood..When you comparing with a car was BRILLIANT. the y is alway running the O determine if it is cool a heat.

[@meghanmccarthy879]

you are the best, 2 hrs on the phone w/someone in India 2 min watching you. thanks dm

[@Environc]

+Meghan McCarthy Excellent glad we can help out

[@JoeLinux2000]

I can imagine the person in India saying in a very strong accent "You see sir, you connect the Green wire to the G and to the G." And you say, "There is no green colored wire. I only have a black and a white, and a red. I'm able to connect the red and white wires, but I don't know what to do about the black. Can I use the black wire to connect G to G?" The person in India says, " It is very important sir, that you have a green colored wire. Without a green wire it will not work. I'm sorry you will have to call a service technician and have him install a green wire, as my manual says only the green wire can be connected to the "G" on the thermostat and to the G terminal on the EFCM. Is there any other way I can be of help sir? "

[@jillflanagan3994]

Glad these guys had the answer I was looking for! The O/B solved my problem, the manual said nothing!

[@JoeLinux2000]

This is a good and helpful video, but I think on your large chart it would be better to show not only the Thermostat connections, but the connections on the furnace or AC (heat pump) unit that the thermostat is connecting to. Also for some archaic reason the industry continues to use the colors of wire as the recipe for hook up. In other words, a red wire is connect to "R" on the Thermostat and to the "R" terminal on the furnace control board. However you could actually use any color wire to connect "R" to "R". It would make a lot more sense to have "R - 24 volts" printed on the furnace board and more importantly in the manual or documentation. I've found the documentation included with a new Goodman furnace to be particularly pathetic in this regard. Another oddity if there weren't enough is "G" to stand for room air fan or Fan . "Y" for AC compressor. Who would have guessed? Why not "AC" for AC, and "F" for fan? On the control board and eeven inside the the thermostat it could be printed as "G - fan" Then there could be a note or sticker or printed into the plastic "Note large letters = traditional wire colors make sure the proper devices as specified are connected together regardless of actual wire color. Apparently a traditional simple thermostat had two terminals and a single insulated wire with individual red and white wires inside. "R" was meant to hook up to one side of a 24 volt transformer, and "W" (the white wire) was meant to go to one side of the gas valve with the other terminal of the gas valve connected to the transformer. When the thermostat closed, the circuit was completed and the gas would open, and the gas would be ignited by the pilot light. Perhaps all of this should be taught in Jr. High School, making American education more relevant and practical.

[@tredogzs]

Educationat school is not to be helpful, its indoctorination to allow govt and coorporations to make money. If it was simple and made sense... what would mech contractors do? And since they build this stuff why would they eliminate their own jobs. That would be like a Doctor selling antibiotics over the counter!

[@waterfalls209]

Keep it simple stupid great job guys!!!!! Understanding makes it so much easier

[@SPECIAL3RD1ZED]

Wasn't sure about this video at first but as I continued to watch it helped me a lot. The O/B section solved my problem.

[@Environc]

Great !!! Glad out HVAC channel helps you out. Its nice to be able to get the thermostat fixed, good job

[@aminzarif4324]

Can you tell when I put nest when I have Y R G W O/B For nest generation 3

[@michaelmorgan1134]

Excellent video. Didn’t get bored. Very well presented and understood. Good job!

[@ronaldharris5562]

good video thanks. im an Electrician but ran in a few. i have a customer that wants to replace a programmable thermostat with a Horizontal non programmable thermostat. i havent even looked at the situation yet but its good to know what each one actually does instead of replacing wire for wire.

[@Trully1949]

Informative and entertaining at the same time. I clearly did not know what color wires served which function. There are several small colored wires coming out of the overall insulated wire. Wish Honeywell would have put together a "how to” video for the thermostat I just bought. Only one was of HW selling their products.

[@thomasferry4255]

Thanks you really help me out. I was having trouble connecting my new thermostat and the OB was the problem when I switched it to heat pump it came on correctly. Thanks again.

[@bminus23]

I have a solar system and a WiFi thermostat. If power cuts off, internet cuts off, I can’t control my thermostat while running solar for my house. Just bought a cheap thermostat and need to wire it. Thanks for this video!

[@NathanRChristie]

I just wanted to say thank you for this video, it is a very good explanation of the thermostat wiring. I just purchased a home and am installing a new thermostat, this really helped. I just wish you were closer to Mississippi so I could hire you.

[@Environc]

That's what we like to hear about!. Enjoy the new house thanks for the comment !

[@joesmith9763]

Good video, comprehensive, easy to understand. Well done

[@Environc]

Thank you for your comment awesome great to know we are making a difference

[@tansit2344]

Good video. This helped me clear up some confusion with my Honeywell RTH8500 and its separate "E" and "W2" wires from the old 7-wire bi-metal mercury switch thermostat. I have W2 running to Aux on the Honeywell terminal block and the system tested fine, just wanted to be sure.

[@Environc]

+tansit2344 Thanks for your comments !

[@bwj999]

Great video. Love your blue collar NC accent - it let me know that you were the guy in the know!

[@jamalbenthall151]

Great video

[@bobc5696]

Well done. Confirmed my recent hookup of a Honeywell unit. Thanks!

[@enviro-ncenvironmentalheat6502]

Its great to help out the community with a video glad it helped

[@Environc]

excellent ITS WHAT WE WANT

[@Environc]

+bob carrothers Great comment thank you

[@je3421]

@@Environc hey any advice on a Honeywell thermostat, that needs a Y wire where there isnt an existing wire from unit? On the previous thermostat there was a yellow jumper wire that was a part of the unit from the factory. Right now, both the T and the unit are running as they should but it seems to be just recirculating air. Any advice on that missing Y wire would be appreciated. Btw, already contacted HW, and their recommendation was quite helpful: "call an electrician". Lol. 👎 * Edit: so just saw that my ac unit outside isnt running, assuming that missing y wire is what would power that?

[@JoeFlemke]

Not sure why there are so many dislikes. Great explanation - thanks!

[@CM-sd4gi]

Never sure why people are so creepy, but I liked it

[@justincase3880]

Decided to watch this video as an afterthought/follow up .. well, I guessed thru it, and got it right .. thx 4 posting this …

[@raedsalem8540]

Great explanation through out especially about the jumper wire.

[@Environc]

Any time you have wires you are not sure about trace it back to the other units , make sure you understand what colors are on what terminals. Because often if they are mismatched you clearly are going to have problems. Sounds like you need to trace it back to the root.

[@JoeLinux2000]

It's not actually about colors but more about having the proper terminals connected together regardless of what color wire is used to connect them. Naturally in a perfect world the colors of the wire would match the color labels on the terminals, but that's not what makes it work. It will only work properly if the proper terminals are connected together on each separate device.

[@lees5402]

Very clear concise information, in spite of the rocky start lol

[@codylynd8097]

90% of the issues we've seen in the field with wrong installations Are following colors. W, to white , Y, to yellow G to green R,to red which is correct until Blue goes to o/ b which is incorrect (C,to Blue) most customers see fuses blowing while attempting to operate the heat, months later. The r jumper you mentioned is if your thermostat controls a separate unit for heat vs cooling like space board heaters and a Ac or swamp coolers. If there is a jumper from rc/rh it stays inplace if not always go to Rc/R with the Red Nice video

[@jollyscaria1922]

Thermostat fiximg conshion ..Ris R y y. W.w..G G .c.c 24v cool .. conter conroll . Outer unit coil contrlled

[@donreece655]

Great Video! thanks guys. Best explanation I have seen.

[@chrishidden6674]

Thank you, a great straight forward explanation of the basics.

[@deenadclute1182]

THANK YOU SO MUCH FOR THIS!!!! EXTREMELY HELPFUL!!! :) Great job explaining what all the letters represented.

[@sigbn]

Great video. However I believe and I could be wrong on this, but I'm sure many of the units I've operated functions as I describe. At about 3:40 talking about the Fan mode and System Mode, you stated if they system is in off mode then the fan will not operate, that the system is in complete off. I believe even if you place the System switch to off, you can still run the fan mode only. It is designed this way to allow the user to be sure that the System settings in heat or AC are not on and can only operate the fan only mode. Say you just want to move air in the house without having heat or AC.

[@dannyrosario750]

This video was so helpful! Thank you so much for the breakdown and understanding of the wiring as this help me with an issue I had with my Nest where the reversing valve was glitched or not working properly, and when resetting helped me make sure the wiring was correct and I set the O/B correctly. You saved me a good 750.00! Thanks again! AWESOME VIDEO!

[@sethj7071]

Thanks! all i needed to know was what the other color for my AC unit was. one was on the 24v, which made sense but was having a hard time finding out where the other wire went to compete the circuit

[@ev4christ]

very clear and precise instructions.

[@carolstrode1493]

Excellent explanation it helped us fix our problem!!!

[@jejouelaflute]

So I put in a thermostat for my mom... Her a/c was acting up and this was an easy fix to try as settings on it were changing when you didn't touch the buttons... I labeled the wires as I pulled off the old thermostat... Holes in the new thermostat exactly the same as the old one... Matching the letters to the now lettered wires... Set up the thermostat and turned it to cool... The heat ran! Mind you I hooked the new thermostat up identical... From what I read maybe an electrical problem actually IN the new thermostat?

[@darrylbranch6818]

You did a fantastic job in the explanation of all of this! Bravo in clear up up something that was as clear as mud to me before...now everything is crystal clear!!! GREAT JOB!!!

[@darleneford8232]

I agree....the cameraman really detracts from the speaker

[@haroldbrown3452]

that vertical video though. and they got subs...

[@peterj.haskett6994]

Hello and thanks for the videos. I am replacing an old mercury based Dayton thermostat with a White Rodgers 1F78. It appears the wiring scheme is unorthodox for this old thermostat but it worked perfectly, I just wanted to convert to digital. Anyway, the blue wire was connected to R5, White wire to Y6 and Red wire to W4. I am trying to figure out which ports are equivalent on the 1F78 because it seems to simply stay on. I have heat only; a Weil-McLain boiler

[@jamesdavis7775]

EXCELLENT! Cleared up a ton of questions.

[@stewart200t]

Very good, Thank You for taking the time.....

[@Environc]

Your welcome glad to help out. simple mistakes can often be avoided with a basic overview

[@aussiewilkins]

Good explanation. Thanks, but please turn your iPhone when doing video so we get a landscape view.

[@Environc]

Thank you and good advice for us. We are android users here is it the same. Gave up the iphone after 4GS. Samsung Galaxy is versatile for our needs.

[@DaltonMcVey]

Yep. All camera censors are rectangular, and are not dynamic. So all phones will be landscape when you hold your physical phone in landscape, and as such, portrait when held in portrait. In other words, when using your phone as a camera, hold it like you would a camera.

[@Environc]

Dalton McVey Thank you again its helpful advice thanks for sharing :o)

[@kthunder079]

Thanks for the break down of what the wires do. However, I have this one question. The orange wire at the Goodman Heat pump which is for the reversing valve, does not have a mating orange wire to be connected in the 5 wire harness arriving from the Heat Exchanger. How do I apply control voltage to the reversing valve?

[@Environc]

Just saw your comment glad to be of help with the youtube

[@OGKenG]

Very amateurish video.

[@jlit1618]

You helped me big time when you said o or b controll switching value. My shit not color coded

[@gimpeyLegs]

Should you have a wire to each terminal? I only have heat, no central air, and only have 2 wires coming out of the wall.

[@nabakorp6219]

No. For heat only, with natural gas or oil, furnace or boiler, two wires are all you need......unless you have a thermostat without batteries, then you'll need an extra wire for power.

[@michaelraddish7898]

Use r and w for heat only

[@denflows]

What if there's no wire attached to o or b on a thermostat?

[@babyboyzgotchu]

what happens if you accidentally run the common wire from the air handler in to (B) in thermostat? is that bad? or will it just do nothing and not affect anything

[@george2916]

nice, clear explanation.

[@ranhill62]

Would have been extra good had you had the wire colors connecting to the terminals as well.

[@karlt10]

Wire color doesn't matter. They may be the same. They may not. You never wire based on color of wire.

[@samuelferrer805]

thanks for the video, I have the L8148E, and I want to change my thermostat for the RTH6580WF. I only use the heat and my old thermostat works with two wires. where you should connect the wires for the other thermostat. Thanks

[@newnanfire4110]

some stats have one terminal for o/b and a switch in side that you flip.

[@bentorres925]

Thanks Great video!My tenant hooked up a thermostat without letting me know and I want to check if it is what I should do to correct it since I think there is an error. The thermostat is a Hunter 44272 that does combine Aux/E my unit is an old Trane (GE). X2 (emergency heat) is going to Aux/E on the thermostat and and W/Aux heat is going to a spot listed as blank in the thermostat diagram that is usually w for conventional heat contactor will my fear is this will activate the heating coils in heat mode no matter what. Should I disconnect w/aux wire from the blank spot (for heat pump) on the hunter thermostat wire nut it and leave the X2 (emergency heat wire connected to the Aux/E? Or should I add the w/aux wire to the Aux/E terminal on the thermostat and just wire nut the X2? or as you said in the video it doesn't hurt to jump should I just add X2 and w/Aux to the Aux/E on the thermostat? Thanks

[@TimKGrimes]

Awesome instruction.

[@Environc]

+Tim Grimes Thank you

[@jerryrobinson7588]

Thanks man. Great video. Very useful

[@Xingularity]

thank you this was clear and precise. just the info I needed...

[@Environc]

+J. José Rivera Torres Thanks glad it help

[@ricardoortiz5790]

When I set up the thermostat to heat my house, it just activates the fan but wt does not give me hot air, just room temperature air. I wanted to upgrade the thermostat and I bought and installed the T5 thermostat. The AC works by the way.

[@Scott.B70]

Thanks, Ryan. Awesome!

[@thomashuddleston6348]

My thermostat for a system has a red white and green wire. My question would be, would green be placed in O or B to close the zone vavle

[@woofdawgg69]

Wonderful video thanks

[@willdixon9525]

Very helpful video. Thanks

[@networth8754]

My existing system is Gas Furnace and single AC unit. My existing thermostat has C,G,W,Y and R (no jumper). The new Thermostat has the choice of RC or RH with a jumper. (no R). Question: Which terminal do I place the existing "R" wire to? RC or RH? Do I leave the jumper in or remove?

[@salinasdoubledutch]

Thanks Ryan

[@reggierichard9052]

Thanks Ryan !!

[@bigeminicbemcbigeminic9196]

"I'm the producer....face the camera" he says while shooting vertically!! hehe

[@wildorchids3657]

LOL..Sorry , I can't help it.

[@lblvnv8039]

I enjoyed your video. I have two Robert Shaw thermostats....9600 and 9610. I have gas/electric units. One thermo will activate a/c-or heat unit by adjusting temperature one degree at a time....normal I think. The other termo will only a activate heat or a/c when you adjust "two degrees"....very frustrating. Do you think this an improperly wired problem or something else? Can you help.lblvnv1 second agoI enjoyed your video. I have two Robert Shaw thermostats....9600 and 9610. I have gas/electric units. One thermo will activate a/c-or heat unit by adjusting temperature one degree at a time....normal I think. The other termo will only a activate heat or a/c when you adjust "two degrees"....very frustrating. Do you think this an improperly wired problem or something else? Can you help.

[@TortureBot]

My Goodman heat pump sometimes will turn the outside compressor unit on but fail to turn the air handler on and then it just runs and runs while the temperature in the house gets either really hot in the summer or really cold in the winter. I was told this could be a sequencer inside the air handler or it could be the thermostat which is not programmable but is a Janitrol with two mercury bulbs inside. If we turn the system off with a switch on the thermostat and then switch it back on later usually the fan will kick on and run fine for a while but then it will start acting up again. Does this sound like a bad thermostat or a sequencer inside the air handler? By the way thank you for helping me understand what the W & E screw terminals are for in my heat pump's thermostat.

[@Environc]

Hi Just saw your question. Yes it could be a sequencer and or the thermostat often best thing check with your meter and see if its calling properly when the system calls for heat. Then you can start to break out where and Isolate.

[@traindisp]

Replacing Thermostat (7 wires) This is the way the OLD one was wired. C - Black Wire O - Orange WireE - White WireW2 - Brown WireR - Red WireG - Green WireY - Yellow WireOn the NEW One - All I had was these letters in this order so I did this: - Blank - no letter to identify this screwC - Black WireY - Yellow WireR - Red WireG - Green WireW - Brown WireRC/O - Orange WireRH/B - White Wire On Cool: Thermostat works like a charmOn Heat: None Stop RunningAny suggestions please?

[@andystitt3887]

Could someone jumper W G and Y to make the themostat control the fan in both heating and cooling modes?

[@bd867869]

Just bought a new Honeywell thermostat looking at the old one i don't have a wire going in to C its say to put the G wire into C slot then to go to furnace and move the G wire to C and jump G to Y. when i look at the furnace there a wire going from Y to C (2 wires in the Y slot) not sure what to do

[@aussiewilkins]

Works the same on Android. Just rotate your phone before filming.

[@mathteacher4140]

Excellent! thank you.

[@Environc]

+math teacher Your welcome

[@mahmoudibnemir8704]

Great video. I have a 2H/1C system that is NOT a heat pump but I am having a hard time finding a thermostat that will reliably work with the system. Biggest issue with the universal tstats is that I'm trying to determine which wire will control the 2nd stage of the gas valve. Any input is much appreciated. Thanks!

[@anthonym7130]

Y2

[@mahmoudibnemir8704]

@@anthonym7130 Needed a furnace to fit into a small space and a Goodman 2H/1C was the smallest. Chose ecobee and it works fine now.

[@ReelGuyTv]

What if there is no orange wire to go into o/b?

[@lanceguilin]

Very helpful. Thanks! thumbed up!

[@n.d.2100]

Hi Sir, my Emerson programmable thermostat 1F78 have green wire and a small screw but doesn’t have slot/hole to screw in. The available terminals that have slots/holes are O & B. Where should I connect the G wire?

[@dp66ny]

I hope you see this... I have a two floor house - 1 heat pump, 1 air handler. Upstairs thermostat is exactly as you state. However the PROBLEM is in the down stairs thermostat... There is NO "G" for the fan... Does it not need one because the upstairs unit has one? Doesn't seem that would be the answer because they are both separate and I can turn off the top thermostat and turn on the bottom thermostat. HELP !!!! I don't understand.

[@Environc]

We have just discovered this string on this HVAC youtube on avoiding mistakes. Have you solved the problem you are welcome toilet us know and we will help you troubleshoot your thermostat issue.

[@zarkus6]

Great video! I have a honeywell three stage furnace. The old thermostat had "W3" but i bought an Emerson smart thermostat and it has a no W3 terminal, but does have a WE terminal. Do you figure it would be ok to just put the old W3 to the new WE terminal? I might be being overcautious, but figured it wouldn't hurt to ask.

[@Josemejia-ln4tp]

hi, nice video. i want to install a nest. my old thermostat has the white wire and black wire connected to the same terminal "w." i was told that i couldn't do the same on the nest. so my question is why are the white and black wire comnected together on my pld thermostat...and if i install the nest how what terminals would the white and black go into. any help is appreciated.

[@reshmapatel3853]

i have abcd green,black,white,red four wire how to installed nest 3rd genration thermostat

[@mrgodfatherful]

Same here. Except I have Blue, green white and red.

[@cat2972]

I don't have a heat pump but I have aot condition when heat is on but not when cool is on. I think my blue needs to be in O. Not. B. THANKS

[@georgelast9991]

Hi, I was wondering if you could tell me what color wire goes to the letter C here in Florida. Thank you

[@naya50]

Great info. Thank you

[@thihal123]

Are there HVAC systems that fill up all the holes in the thermostat?

[@Fliplove00]

What about a 2 old gas furnace without a C wire. How to add a C wire to an existing gas furnace?

[@josevidal-fi4sb]

I have an issue. I tried replacing an old analog thermostat (2 wired), with a newer programmable Honeywell thermostat on an old Coleman presidential 2 on my mobile home. Once I switched the power on on the furnace, the ac started blowing. No matter what function I changed on the new thermostat the ac would not turn off. Any suggestions?

[@baylifehvac991]

Are your 2 wires going to R and G on thermostat.

[@ksystems872]

I like how he says how o/b work but not how to change it like everyone automatically knows

[@mobitechaz]

Im stumped. Trying to install a smart tstat that requires a C wire. Ive got 29V from R to Y, G, O at my tstat. My R to C has 29v at the heat pump unit. I ran a blue wire from the C terminal at the heat pump unit down to the tstat. The other end of the same blue wire that reads 29v at the heat pump only reads 16 to 17v at the tstat end of the wire. WTF? What would cause the wire to lose 10 Volts? Its no longer than 7 feet of length (at least that's the physical distance from the tstat to the bryant heat pump unit on the roof. The connection to the C term is solid. There is continuity. Somehow, as that blue wire is snaking through the drywall down to the tstat it is losing 10 volts. I can't explain that. I tried a different wire, and same result. 17 volts. Makes no sense.

[@johnh6788]

I have two black wires plus a ground. What terminal does the ground go to? Also, is R positive and W negative? Thanks!

[@topherdean1024]

What the hell? That's a lot of wires for a wireless device. I was assuming that I would have to connect some wires to my boiler from a device that would receive signals from the thermostat, so I don't have to fish wires from upstairs down into the basement. My boiler is all set up for two zones, presumably upstairs and downstairs, but there's no thermostat for the compressor for upstairs and only one thermostat located downstairs. Consequently, the upstairs is intolerably hot. Isn't there some kind of thermostat that I can install to activate my other zone without running wires to my boiler?

[@Sporking]

How about a Amazon thermostat. I spliced G and C and it seems to be working fine. I tried using a C adapter but failed miserable lol

[@RINEYMOTORSPORTS]

I know this is going to sound stupid but I got mad and smashed the thermostat in my hallway I went out and picked up a new one I put the white to W the red R the blue to b the green to G and the yellow to y now when I turn on the heat the outside unit wants to run and no it's not a heat pump but when I kick it to AC the outside unit does not come on just wondering if you could give me any idea what could be wrong

[@eliavila4202]

my ac unit just got installed.. and the green (g) wire was put on the (o )spot and the fan is runing continuously on automatic.... now I have a gas furnace... should I move the green wire to the (g) spot???

[@JulesBartow]

The G spot? Is this sex ed?

[@aplusmhs]

Can I wire my thermostat to run heat only? I was going to run power for AC in the spring. (heat pump)

[@nabakorp6219]

Yes. Run the red wire to Rh, and the white wire to W. That should work, but if not, check the wires connected to the furnace or boiler. Are they red and white, or did somebody use a different colored wire? This is done at times when the original wire fails, or when a homeowner who knows nothing decides to try their hand at hvac. So, if you see differently colored wires connected to the boiler or furnace, hook up those same wires to Rh and W for heat only.

[@warham4155]

Awesome video.. GUys do you have codes for honeywell thermostats? mine is displaying E2. its an old unit from 2002 T8411R

[@Environc]

What type of model and make of thermostat? We will look it up. Thanks for asking it took us a long time to realize you asked a question.

[@michaelcampaniello9515]

Environc rth2300/rth221

[@atiqsmail]

I was trying to install a new 5 wires thermostat replacing an old 4 wires. I used extra wire as c wire but the furnace terminal board side already has a wires attached to it(C and Y), which runs to out side compressor unit. when I attached the new run c wire to this c terminal it is blowing out my 3 amp fuse. where should I connect the c wire of the new thermostat then?

[@virtualtube1]

I have an old Snyder General but my wiring is different to that of what should be standard. I have X, R, B/C, G, W. I'm trying to connect Honeywell Wifi thermostat. What does the X and B/C really mean? I can email a picture. There are 4 wires coming from my old thermostat (no common).

[@alessandrapanella9100]

An old humidity control as well I installed a new digital AC but I don't know what the humidity control how to remove it what do I put those two wires the ride and the Y

[@tonykwamekey7499]

C is common and that was hooked up to my old thermostat. Where would I put that on a honeywell RTH2510?

[@77yokie]

I Have W..... Y..... G..... Rc..... and C wires from my wall but the new thermostat i got doesnt have Rc .......its just R...is it possible to connect Rc wire from my wall to R to my new thermostat?????

[@donschop367]

Hook up my wiring seems my common is blowing the 5 amp fuse when i switch it into heat mode. Why i dont see any bad wiring

[@katw3553]

THE FURNACE TURNS ON WHEN I RUN MY AC! HELP! ANY IDEAS? TROUBLESHOOTING?