Nest Wiring Diagram How To Install C Wire or Common Wire

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We teach you how to install a C (common) wire on the Nest Thermostat
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In this video we do through the wiring diagram for installing a Common wire with your nest thermostat. You can install a common wire to provide power to your nest thermostat without needing to run new wiring. You can use the G wire as a Common wire if you also convert the connection in the furnace. This is a possible solution to provide power to your Nest Thermostat if it has been determined that your nest thermostat is not receiving enough power.
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Опубликовано:

23 июл 2024

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Комментарии : 367

@dmband123104 5 лет назад

Great explanation! Was so confused with the "cooling delayed for x amount of time." This was quick, easy and it worked!😁

@alurnaxe5470 2 года назад

Simple and to the point! I spent hours asking folks at Home Depot, etc, and searched the web reading about its possible to use the green wire as C wire but was confusing, wasn't sure if I need to bridge green with C or how to do it. This answered all my questions as a noob and save some serious $$ booking an HVAC "specialist" for a home visit/ thermostat install. Thank you!

@danthompson69 4 года назад

I cannot thank you enough for your video on using the green fan wire plugged into the c slot to power the thermostat. I would have never thought of that in a million years. My nest was a mess. No decent power supply. The adjustment I made based on your video was done minutes before the ac tech was due to arrive for my summer ac check up. Had I not done this work around the tech would not have been able to due the check up. The standard visit for a check up is 60 dollars. The charge for diagnosis of a problem is 90 dollars. Your advise saved me 90 dollars!! Thank you so very much. Dan Las Vegas.

@jonathangrossmann8708 4 года назад

Thank you for your helpful video with an excellent description of what to look for and how to fix the common wire problem. I was able to pull a new thermostat wire from my unit in the basement up to the thermostat and using the wiring diagram figure out the common wire and add power to my Nest thermostat. It had worked for about 2 years but with the heating system and Hot water heat, not running the fan, my battery was low on voltage. Fixed for the cost of a new wire.

@pauldalton8282 3 года назад

Thanks so much for the clarity and such an easy fix. Took me less than 5 minutes to complete. PERFECT!!!!

@jessicalee4318 4 года назад

It worked!! Took just a few minutes to figure it out after watching your video. Thanks for making this video it was very helpful.

@briangotthardt7968 Год назад

Amazing!!! After watching this video I was able to switch the 2 wires in a couple of minutes. It was exactly as described. I am a visual learner and the white board you used was perfect. The symptom of my Nest was it would turn on and turn off right away over and over. This fixed that. Tks so much!!!

@glennroid2833 3 года назад

Really helpful. I wouldn't have considered doing this unless it was this easy. It made sense and seems to have worked. Thanks!

@OneHourSmartHome 3 года назад

Glad it helped!

@bjdpenne 3 года назад

This tip worked for me!!!! Last night was the first night I really needed heat in the house since I installed my Nest. I was freaking out because we were cold this morning and the Nest kept saying delayed for 2:30 and the furnace wouldn't stay on for more than 60 seconds. Now... the house is getting warm with the furnace running until the room hits temperature. A most sincere thank you to you from me, my wife, my children, and my pets. We won't freeze again tonight.

@Blackdog4818 3 года назад

That's sounds awful. Why would Nest make a system that isn't transferable from existing systems with the same electronics? Is the C wire for wifi/app control?

@cbarbs638 3 года назад

Thaaaaaaank youuuuu!! Going to try this in the am. Video is sooo simple to follow! I’m Living on space heaters in Winnipeg atm brrr 🥶 ❄️ 🧊 ⛄️

@user-hs9pi1rq3c 2 года назад

Works great! Exactly what I needed.

@hiorti 4 года назад

Thank you! Nice and clear explanation. Much appreciated.

@OneHourSmartHome 4 года назад

Glad we could help!

@garywoodard1983 2 года назад

Thanks for the easy fix and simple explanation!

@tomsteffan2 3 года назад

Finally a fix for my Nest to keep the A/C from short-cycling. Thank you.

@MiyahSundermeyer 5 лет назад

I bought the 24 v transformer/common wire after seeing one of your other videos additionally to talking with my Hvac guy

@OneHourSmartHome 4 года назад

Glad we could help, this is the transformer:ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gahPxCcPDto.html and the other video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gahPxCcPDto.html

@johndixon6747 4 года назад

This is a great solution for those who have only four wires running from the thermostat to the furnace/blower unit; however, it's been my experience that most electricians will use a cable with six or seven wires and just not use them all. The easiest solution is that, if you have this situation, connect the black (common) wire to the Nest, and go to the furnace/blower, and connect the black wire to the common terminal. Another solution (if you don't want to sacrifice the functionality of turning on and off the fan from the Nest) is to use your old (4-wire) thermostat cable to pull a new 6-wire thermostat cable. Securely loop individual wires form the old cable to the new one and then tape over the connect so you have a smooth surface to pass over any tight spots along the root. Go to the attic/basement/furnace closet and use the old wire to pull the new one through the wall/floor/ceiling, etc. and connect it as diagramed here.

@CitizenPerkins 4 года назад

Nice solution, sir! Might you be a fellow IT tech who has fished a few Ethernet wires in his day?

@srodaki7417 3 года назад

I watched 20 videos before this one. This video answered everything in a short time.

@DrShout 5 лет назад

Thanks... all other videos didn’t address only 1 Red wire connection location. 👍🏼

@resandor 4 года назад

You're a great teacher

@melyvaldez2715 3 года назад

Thank you so much for this video it helped me set up my new smart thermostat without a c wire.

@justincamp3679 3 года назад

Worked like a champ! Thanks!!

@bjpayne03 4 года назад

Worked perfectly. Thanks!

@OneHourSmartHome 4 года назад

Glad I could help!

@brandonevershed5362 5 лет назад

Very good tip!! I was trying to figure out what I was going to do, now I know!

@OneHourSmartHome 4 года назад

Glad I could help.

@user-tk7zn6pc5x 5 лет назад

Good explanation and clear. Keep it up!

@OneHourSmartHome 5 лет назад

Thanks!

@ChicTiff 5 лет назад

Wow this is brilliant. We started using the air for the first time with the nest and have had problems so I’ll have to try this.

@OneHourSmartHome 5 лет назад

Glad to hear it helped! Thanks for the comment.

@rgruenhaus 4 года назад

I am going to be replacing an infinity thermostat from 2007 to a wifi thermostat. Do you know if the infinity thermostat uses a C wire?

@craigfredryk8205 4 года назад

@@rgruenhaus an infinity thermostat is communicating. You would have to rewire the furnace to the conventional terminal block and use the r,c,y,ect terminals instead of the abcd plug infinity systems use

@tinarenaud 5 месяцев назад

Thanks for this video and advice!

@ganthonychaparroful 4 года назад

I only have the Y1, R, and W wires only. My old thermostat had a bridge-wire. Do I still need to add a wire for the C?

@brandonharelson2843 4 года назад

Great instruction James! Keep it up.

@OneHourSmartHome 4 года назад

Thank You!

@supermaxd22 4 года назад

It worked out great, thanks!

@OneHourSmartHome 4 года назад

Great!

@lorensmith5095 5 лет назад

Hi, I have found your videos very informative hence the following question: I currently have 2 thermostats 1 for my evaporative cooler (Dial) and 1 for my heater (Honeywell), I am trying to setup a 110vac evaporative cooler w/ 2 speed motor with my 2 wire 24vdc heater on a single programable thermostat a Nest (tired of constantly fussing with 2 thermostats including recalibrating them almost weekly).I know that I need to step down the voltage to the thermostat to 24vdc from the cooler, what is the best way to go about this … I purchased a Mastercool Master Stat control box but from all I can gather the interface wires only output 3.5 vdc (only 3 wires not identified beyond Red, Black, White), and I know I will probably have to rig a "C" wire per your video, any suggestions on how to step down voltages from the cooler to interface w/ the Nest?I have tried a single stepdown transformer/relay but probably need multiple is my thought and I am assuming that I will need to connect the low to Y1 the hi to Y2 but not sure where to connect the pump O/B maybe?

@scottsiegers 4 года назад

HELP - I have an HRV, can I run a common wire to the star terminal similar to your video on humidifiers? thanks

@TheRealKasseim 5 лет назад

Great video, very helpful!!!!!! Right to the point!!

@OneHourSmartHome 5 лет назад

Glad we could help! Thanks for the comment.

@De-niro31 4 года назад

Gracias señor. thank you this video really help me get my new term... install

@OneHourSmartHome 4 года назад

Glad it helped

@maxvanbeek4527 4 года назад

Thank you. I have had my Nest set up for years, but never had cooling working. Heating has been fine. I watched 2 minutes. Went to my Nest, made the changes, and we have cooling. Thank you..... My family thanks you too....

@OneHourSmartHome 4 года назад

Great to hear!

@westlee9334 2 года назад

You saved me from a headache lol very well explained. Thanks bud

@colleenhearn7419 2 года назад

This was the fix I needed.

@shauncooper7447 День назад

This helped so much thanks!!!

@PRINCEAND0104 3 года назад

great information but looking at some other video and some are saying to use a jumper to Y and G on the control board @ the Furnace any help on that ...

@MrPiper27 11 месяцев назад

Excellent video, thanks so much

@user-ql7xu6oc4n 8 месяцев назад

Great job, thanks bra!

@anandcosta 4 года назад

I’m going to install Nest Thermostat E today following this video. Hope all goes good. I’ll comment after installation.

@OneHourSmartHome 4 года назад

Good to know, glad we could help.

@anandcosta 4 года назад

@@OneHourSmartHome i installed it in the same exact way in this video. Works without any problem. Saved money from new wiring and installation charges. thank you

@OneHourSmartHome 4 года назад

@@anandcosta Thanks for the update and happy to hear it worked for you!

@leviwatson8946 2 года назад

Great video and instructions

@BleedCubbieBlue 3 года назад

I was ready to break some walls, you’re a life saver.

@anthonygervolino7662 3 года назад

Lmao.. same here

@Singkhorn.S 4 года назад

Great video! Lucky for me the C wire from the thermostat was just left unconnected to the control board. So I just connected that using wire nut the C wire which is already going to the outside AC unit.

@OneHourSmartHome 4 года назад

Glad it helped!

@rettjet8062 3 года назад

Very nice presentation. 👍 Some suggest to put a jumper wire between Y & G terminals at furnace side. What do you think about the jumper?

@woodytheman2497 Год назад

Excellent excellent explanation.

@javierdomenech8221 4 года назад

Nice explination i have 29.6vlts at the termostat 2nd issue my air handler has relays i didnt see a board. I called nest i was told too much volts at the termostat do i conect a common wire and how thanks

@ljhasbun 2 года назад

Thanks this was alto off help I had 5 wire so I just added it from the furnace to the c terminal

@JamesHoy1 5 лет назад

Thank you

@OneHourSmartHome 5 лет назад

Glad we could help!

@carlosmtravels 3 года назад

Hey man, live the videos. I have a current Trane comfortlink thermostat with three wires, D,R,B. Do you think it’ll be compatible with a nest? There are extra wires that I could use for common.

@warrentran4015 5 лет назад

Hello James, Excellent video, have questions below to confirm situation before approach. I have a typical single family fan forced heating/cooling system, converted to NEST thermostat, heat works fine but does not recognize AC per follow hookup (the outdoor condenser fan is constantly “on” unless I pull fuse). Here is the wiring details, please help. Thanks. NEST to HVAC Rh R W1 W C Y G G Com24v There are two wires coming from condenser are connected to “Y” and “Com24v). I have access to add new wire if needed. Thanks again.

@jgfarms 4 года назад

Have a Nest thermostat E . Purchased a 24V DC common wire. But i dont get where i hook up my wires to existing RGYW ? please help

@cuttingedgecool7235 5 лет назад

Great tip to steal the G (Fan) wire!

@OneHourSmartHome 4 года назад

Glad I could help.

@1djkksullivan 4 года назад

I have a Nest E thermostat but only 2 wires coming in so no power, am thinking of adding and external transformer but the transformer has 2 wires . One will go into the C terminal, but where does the other wire go, the Nest E has no other R labeled slots? Do I just cap the wire? Great presentation. Thanks for any help.

@Downfallofusall91 4 года назад

What would cause the nest to cause my furnace to short cycle? i installed my nest and when i emailed nest support to see if my system was compatible i was told to wire to the white and red i tried to turn on my furnace and it would turn on.. then off shortly then on then off.. I installed my old thermostat and my furnace works fine. so i'm not sure if the nest support gave me the right set up.. but something isn't working correctly. my thermostat that i took off had a W wire.. and red wire to RH with a jumper to RC, when i contacted nest support to see if it was compatible she sent me a picture showing to hook white to W and red to RH for the nest. i did this and it caused my furnace to short cycle. i have a green wire in my wires but it wasnt hooked up to anything previously and i'm not positive if it even goes to my furnace. any assistance would be awesome.

@kristincheng2990 4 года назад

Life saver!

@OneHourSmartHome 4 года назад

Kristin, thanks for watching glad we could help!

@MrFrankom21 5 лет назад

I have a dual zone setup. My fan is set to constantly circulate air at a low speed but is controlled by the downstairs Nest Thermostat. I want to replace my upstairs thermostat with a Nest so can I still use the G wire solution and not affect the fan?

@Saddnnd 5 лет назад

I've been trying to figure out how to fix the COOL setting on my Nest Learning Thermostat (Gen 3.) I don't have a yellow wire, but I do have a black wire. I also have a white wire, a green wire, and a red wire. Can the black wire be used in place of the yellow wire? Been trying different combinations all day. No luck. Seems like I need the Green wire as a fan wire since it doesn't auto turn on the fan when changing temperatures. The house heats no problem but the AC unit turns on and doesn't pump very cool air. The temperature seems to stay at the same temp with and without the COOL setting on. My current set-up is Black wire into Y, White wire into W, Green wire in G and Red wire into Rh. (I've also tried the same setup with Red wire into Rc instead)

@feyrband 5 лет назад

In most cases the colors don't technically matter, they just help keep things standardized and consistent. So long as the end of each wire goes to its mate.

@patrickn2298 3 года назад

Thank you for saving me money. As a bonus, my upstairs is no longer a few degrees warmer than the surface of the sun.

@OneHourSmartHome 3 года назад

Lol, thanks for watching!

@jollyscaria1922 2 года назад

1 steaged 2nd steaged Y,iY2 c common g 24 vpk

@jollyscaria1922 2 года назад

W,1w2 heatar

@davidhulbert2527 4 года назад

Your videos are very helpful but I am still having a problem with getting the Nest to work. I have a Lennox HVAC and an Lennox iComfort WiFi thermostat. The termninals are labeled R, i+,i-, and C. There are five wires: the 4 usual ones and a light blue one. The green and the blue wires both went into the C terminal. Is the blue wire a common wire?

@abujabi 3 года назад

I don't have cooling, can I just use the y wire for this if it's already there?

@jamescoombs2569 4 года назад

Very good trick!

@OneHourSmartHome 4 года назад

Thanks!

@jasonruft2952 4 года назад

Hey love the videos. I have r and its jumper to rh. Do I not use the jumper and just connect the r to rc on the Nest? Thank you

@CitizenPerkins 4 года назад

If you're saying your heater's control board has R and Rh jumpered, then, yes, just connect the thermostat side to EITHER Rc or Rh. According to Nest, they're internally connected/jumpered.

@aldolevano9230 4 года назад

Thank you for your information.. I have a question- its possible just do a jumper wire in thermostat from G to C?

@OneHourSmartHome 4 года назад

No, that won't work. You can either do this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gahPxCcPDto.html with a common wire adapter: amzn.to/2UEerxs or you can change over using this method: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-w0BZPx8-Q5o.html

@skmk88 4 года назад

Hello, I followed your video. Thank you. I’ve had my nest running for a week and then it stopped. Issue with Rh power not giving enough juice. Changed out my transmitter, worked great, then same thing happened after like 10 days. Not sure what else to do. I have the G and the C wire. Would it be smart to connect the W1 and Rc wires together?

@icur 4 года назад

Get a C Wire Adapter, it is a thin white wire, drill hole all the way through the wall where the wires come out behind the thermostat (that is if you have a room there? and nothing is in the way?), push the wire through the wall with a coat hanger etc., now all you do is plug in the adapter (in the other room) and you will never have a problem again, you have to buy a 8-10" long drill bit and say 1/4" wide or so? It is easy.

@poolshark1520 4 года назад

Watched this and had to figure out that the previous owner had swapped the brown wire so we're all set. Thanks for the info, we've got our Nest back!

@OneHourSmartHome 4 года назад

Glad it helped

@ammar36000 4 года назад

Thnx

@sudeshputran69 3 года назад

Super

@erinparks1486 5 лет назад

Wonderful video

@OneHourSmartHome 5 лет назад

Thanks for the support!

@pintsav Год назад

What if I have a hvac from 1980. Since the C wire need 24v is there another place I can tap into?

@idealdirecthomeimprovement1639 3 года назад

You are the man! Thank you so much! Your explanation was amazing! I have one question, my nest thermostat doesn’t activate the furnace above 24 degrees Celsius, 75 degrees Fahrenheit. It takes it sweet time to get there. I have a two stage 80k btu brand new keeprite furnace. All the wires are connected, or at least I think they are. An hvac guy installed everything, I didn’t do it myself. He blames the nest thermostat 3rd generation at says it’s a piece of garbage. Is it me? Is it the thermostat or is it him? I’m trying to figure this all out. Hence I’m here and subscribed to you because you explain everything so simply. Please let me know your thoughts. Thank you in advance!

@rgruenhaus 4 года назад

Each time you mentioned the C wire and G connection it was helpful, but as you mentioned earlier a heat pump might be different so you might have wanted to say something added about the fan not being needed because the furnace turns on the fan "Except" when you have a heat pump and the fan is turned on without the furnace or compressor to circulate air when minor changes in temp are only needed which saves money!

@OneHourSmartHome 4 года назад

Robert thanks for the insightful comment. We're adding a video on heat pumps also.

@JuanCarlosRosas 4 года назад

Excellent idea. However I don’t have a C terminal on my HVAC 2 stage Trane. Connected I have a W3, W2, W1, G, Y2, Y1, R, B, Yo. Open I have BK and O. Can I use my green cable connected to the G terminal to either the BK or O terminals to my WiFi C terminal? I have to add a C wire for my two stage ac to work properly. A million thanks in advance!!!

@rickmcculloch374 2 года назад

Only two wires on a hot water boiler, can I use the new Nest thermostat without any modifications? I have the gen 3 in the house but bought a basic Thermostat today at HD and now concerned that it won’t work without another power wire? Mine are W and Rh

@Mr1973240Z 2 года назад

I like your videos, they are very clear. I have a question, my air handler has two wires on the C terminal but my Nest thermostats C terminal doesn't have a wire on it, can I put a third wire on the C terminal on my air handler and run it to the C terminal on my Nest thermostat?

@shahabh8942 3 года назад

i have a 2 zoned system so i started by moving the fan wire from thermostats 1 & 2 on the zoned control board to the common. I then traced those wires to the 'equipment' section of the zoned control board and moved the fan to the common. Lastly, i traced that back to the main circuit board and found the fan wire was not being used so i plugged it into 1 of the commons (the board had 2 - 1 that was going to ground and a 2nd). After i turned the breaker back on and tried to run my thermostat, i must have blown something - now the furnace and zoned control board LEDs are not working. Any tips would be greatly appreciated - hoping i didn't just create a big invoice for myself from this! Plus it happens to be very hot today.

@loverespectkindness4864 3 года назад

Greetings, I was wondering if you could help me. I had the following wires on my old thermostat: R, Rc, Y, W, G, and C. I recently bought a nest, but when I hooked up the wires, R to Rh on the new Nest 3rd Generation thermostat, W wire to W1, G to G, Y to Y1, and the common wire to common, but the nest product wouldn't power on, when it did come on it said that the common wire didn't have power, so I manuvered the wire that was in the common spot and plugged it in O/B and my heat and cooling are working. Will it be okay, or should I take it out?

@vicalisauskas6029 5 лет назад

Thank you ! It helped to fix issue , without spending any 💵

@OneHourSmartHome 4 года назад

Glad I could help!

@gundamkei3756 3 года назад

This is actually kinda genius. Yes we don't ever use that "fan only" function on ours and i think we just have four wires. Using the green fan wire as common is the best solution, I never would have thought of that. They sell AC adapter plugs for 20 dollars if you can't change the green wire for some reason.

@Reviewerguy1228 3 года назад

i also have a orange wire... does it go in the OB slot? i have yellow (y1), green(g), orange(ob), white(w1), blue(c), and red(rh).... do i need to swap my rh to rc?

@honeymu5tard302 Год назад

I also have an orange wire. Any solutions here?

@landrykilpatrick949 Год назад

@@honeymu5tard302 my setup was… y1- yellow G- green OB-orange Rh-red C-blue w1- white

@jackdup 4 года назад

Because I use the fan to continue running for a few minutes at the end of the cooling cycle, I decided to use the W wire as the C wire. Yes, I will have to switch this back in the late fall, and can then use the Y wire at that point, but I won't loose the Fan feature of an extra few minutes of cool air after the cycle completes.

@shawnglass8458 3 года назад

What do you do if you have a common wire but it’s only putting out 16.5v ac? My friends house has a thermostat for upstairs and downstairs but it’s not two independent systems. Everything in your video matches the wiring. But no power detected because the common isn’t putting out enough voltage. Any advice you can offer would be much appreciated.

@jonathandelapaz8679 Год назад

I have the thermostat installed into my AC unit. The heat is separate. The heat has a control unit that has all the terminals nicely labeled. But the AC unit doesn’t have a control box like that. Everything is wired directly to the relays and transformers. Any suggestion on where I could install the C/Common (ground) wire too?

@davidgardner3792 3 года назад

Thank you! This fixed my problem! I installed a nest e thermostat late last spring. When in cooling mode, my draft inducer fan (for heating) was turning off and on continuously when the air conditioner was running. After what you said about sometimes using the "common" wire, it turns out that I had to connect the blue wire to the "C" terminal and also to the "C" terminal on the furnace circuit board. My old t-stat did not use this wire. The nest e directions did not require me to do this. It solved my issue, no more draft inducer fan running during the cooling mode. THANKS!

@OneHourSmartHome 3 года назад

Awesome! Thanks for sharing the comment as this can help other people with the same issue. Thanks for subscribing.

@samlahidji 3 года назад

I think I’m in the same boat. My 5th wire is blue and unused at the thermostat and at the furnace. I’m planning to use it as a common. There are already two white wires connected to the common screw at the furnace (probably to the AC and to the humidifier like you said). Sounds like it is okay hook up a third wire (blue) to the common screw. Sound right?

@andyargueta6948 4 года назад

Can l hook up the fantech to the thermostat?

@Dpixtion 5 лет назад

Could you run a wire from the connected G wire and bridge it to the C terminals..? so one green wire (fan) connects to both G & C ..

@OneHourSmartHome 5 лет назад

Your fan would most likely be running 100% of the time if you did this because current would be going through the c wire. Never tried it, and have not recommend it as a solution but share the results if you try it.

@DrSushilPanda 3 года назад

Can you please let me know what wires correspond to A+ B- R and C in google nest 3rd gen . Currently I have a Honeywell water furnace thermostat connected to my Geothermal

@lesio333 4 года назад

Brilliant and simple. Thank you :) Can you put a jumper between G and C (if there are other wire on C already)?

@hokanut 4 года назад

No. A jumper from any of the other terminals to C will cause a direct short and at best blow your 24v fuse in the furnace circuit board or at worst burn your new 200 dollar nest stat.

@OneHourSmartHome 4 года назад

No, you cant jumper. The c wire goes in one terminal for providing power and the g wire is fan control.

@lesio333 4 года назад

@@OneHourSmartHome thank you

@nathanmellott2262 4 года назад

So I only have a 2 wire setup, (no AC) and no common wire. Furnace has been super finicky lately, so I'm going to try to run a new wire as I have access to the inside of the wall through the opening where a French door once was. Do I need a transformer of some kind or am I good to just run a wire from C to C?

@jillwagner4455 3 года назад

I have this same issue. Were you able to run wire from C to C? And what kind of wire do I buy???

@nathanmellott2262 3 года назад

@@jillwagner4455 so I actually didn't end up running another wire, but they do sell furnace wire at a Lowe's or a home Depot. It looks like one big wire but there's actually five smaller wires inside of it. As for my actual issue, it was the circuit board itself inside my furnace that was bad.

@us-unclesam6566 2 года назад

I got a hot water heater with only two wires, red and black hooked to thermostat. No bus bar at heater hoked up with three zone vales each controlled by a separate thermostat. Need a C wire and need a good idea how to hook it up.

@amontoya4705 3 года назад

thnks for the info. have problem my furnace board don'g have a c connector what can do

@OneHourSmartHome 3 года назад

Glad to help!

@PeHtr Год назад

Very informative. Question what happen if you have a blue wire instead of yellow??, I used the blue as a yellow it work until today it gave me a message saying e75 ??

@gevorgnersesyan4904 3 года назад

Great presentation! Is their any opportunity to connect two various devices, like conditioner and boiler to one Thermostat?

@wholio50 3 года назад

Thank you, looks simple. Now, ...my furnace circuit board does Not have a screw terminal. The 18-5 cable from the thermostat is attached with wire nuts to other wires, to a plug, and connects into the board. The C wire is wrapped up, ' Not used'. So, at what point, or where can I attach the loose C wire to ...(is the common pin/wire connection on the same plug? )

@jenniferzee7190 4 года назад

I just replaced my fan coil HVAC system in my NYC coop apartment. My contractor only ran one wire for the thermostat. I just purchased a 3rd generation Nest. How should this be connected? Does that one wire power the Nest and control the fan?

@hokanut 4 года назад

No thermostat uses only one wire. Look at it again.

@Mr12timoteo 7 месяцев назад

hi good video but i have 5 wires Rh,Rc,W,Y,G, how can i stup the C wire in the nest thank

@arnelbantugon2678 2 года назад

Hello,is it applicable to a zoning also? I tried to wire it like you do but it look like it’s not working on zoning.Hope for your kind response.Thanks

@geegeevenkat6415 5 лет назад

HI I have Red and Blue wires in my carrier Thermostat,It says V+, Vg, V+ Red and Vg Black. Will 3rd gen Nest work with that? I connected to RH and W1 only Heating shows up.

@OneHourSmartHome 5 лет назад

You would need to take out your existing wiring and wire up new wires to from your furnace to your thermostat. The V+, Vg, V- wires are typically associated with proprietary wiring and thermostats from carrier, so as is your wiring is not compatible, but you can replace all of the wiring from the furnace to the thermostat and it will work. Rather than open up walls a lot of people will just place the nest near your HVAC system so you can install it easily without running wiring everywhere. You can then add nest temperature sensors: amzn.to/2zacgpu for other rooms if you want to hold the temperature in a specific room.

@thair 2 года назад

Any idea on how to connect / workaround and setup nest thermostat with a 240v system ?

@jacobkukla1796 2 года назад

What will tell the fan to turn on if you have no g wire.? Should I run a jumper between w and g to make sure fan turn on when it calls for heat???

@Rainy78 5 лет назад

I just bought a Honeywell Wifi T5+. Do I have to jump the G and Y to this unit after switching the Green wire G to Common wire C? Thank you!

@OneHourSmartHome 5 лет назад

no you won't need to jump it, but you would need to change the connection from the G wire inside the furnace terminal to the C wire.

@Rainy78 4 года назад

What if I have one red wire that is split between R and RC. How would I go abouts hooking up the red wire to my new Honeywell T5+ wifi thermostat? Thanks!