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How To Install A Common (C) Wire: The Easy Way
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- Опубликовано: 7 авг 2024
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We teach you how to install a common wire for the Nest Thermostat. The Nest Thermostat is one of the most popular smart thermostats on the market but if you are having a low power issue with your Nest Thermostat you may need to add a common wire for your Nest Thermostat to properly operate. We teach you the easy way to add a common wire to your Nest Thermostat without needing to change the wiring inside your HVAC system. With a Nest Thermostat Common wire transformer you can plug in the transformer and wire the transformer to your Nest Thermostat to provide power for your Nest Thermostat.
In this video we teach you how to install a c wire for your Nest Thermostat and we have another video that explains how to wire a Nest Thermostat. Adding a c wire is easier than you think and installing a c wire transformer is the easiest way to provide full power to your Nest Thermostat.
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Thank you so much for sharing this video. I added that exact nest thermostat to my barn infrared heating system which was a two wire system, and needed to add the external C wire. I tried to figure it out myself and it wasn’t right. By watching your video, I was able to see that I had my two external power wires flipped around. I will now go back and reinstall it by putting the two additional wires in the correct order. Thank you for keeping it simple but well explained.
I installed the latest nest system in my house and that went well, as my system had a c wire so it was an easy install. Thanks again
I just wanted to thank you SO much for this video. Game changer. Sounds crazy, but you really impact people's lives for the better. We have an old boiler (that works great) but doesn't have the power for the nest unit. Local contractors are not smart home educated (nor necessarily want to be) and thus we were really stuck. I am not the handiest nor have any idea re:wiring, but your example was SO simple. I bought the adaptor off your link, showed up the next day, 5min install and BOOM. PERFECT. My son was so excited it all worked. Thank you so much, real people watch these and real families benefit. Many thanks
I thank you for the clear instructions and finally have a good power feed to the nest.
This worked brilliantly! Thank you!!! I should say, I had a wire in my RC terminal and I needed to solder one of those transformer wires to it so both would be able to use that RC port. That worked just fine. I just tinned the transformer wire and wound it around the RC wire - touched it with a touch of solder, then plugged the RC wire into the NEST port. Worked like a charm.
Thanks for posting this. I had to do the same thing. It would not work without the existing Rc wire connected.
Just had to do the same thing. I had to add a bridge from R to Rc.
Your videos were very informative and has also helped fix my nest thermostat.
Thank you so much 👍
For this video I had followed your instruction but reading through the comments, I found out that I had to connect Rc or Rh wire along with the transformer (adaptor) wire to make it work.
Thank you for the super helpful video. I'd been scratching my head over how to make it work for a while. Finally got it installed today thanks to you!
By far, this is the easiest way I’ve found. Thank you sir ✊🏼
Great video. I watched a couple and yours was the most concise and informative. Thank you!
this is very useful video for many people. Although it is good, you should replace it with one that actually demonstrates the installation to the wall so people could see what different scenarios would look like. For example, i have 2 wires, and will be only using one as you mentioned (the w) while the existing wire that used to go to Rc, will sit idle/unused (if i understand you correctly).
This was my understanding as well. May I ask if you installed it and were successful?
@@anon-4419 this was a while ago. let me know if you need me to check my config, but i will say it is working for me now. i only have heat, but yes it works. although note: i have switched to ecobee, and am thinking of switching to new nest thermostat perhaps this winter. I personally need to know how much time the heater is running (total hours) so i can truly gauge cost and usage. honeywell doesnt do this, and ecobee is vague at best.
So this kind of worked for me, then after a little more research and this guy has a full break down of all the different slots on the base of the nest. What some people were doing was leaving the RH wire were it was (instead of removing as he states in this video) and also placing in the transformer wire. What I did that worked for me was leave my original wires where they were, I put 1 transformer wire in C and the other in RC. He stated in the other video that RC and RH are the same exact thing but one is for cooling and one is for heating. But if you have a cooling system AND a heating system this won’t work, in my case I only have a heating system hooked up to the nest so this worked for me. Thank you to the person that created this video.
This comment was very helpful to me because I believe it cleared up my confusion. and I wanted to say thank you for that. Just to be sure though, I have rh and w wire for heating. Instead of putting one transformer wire in rh, I can put that one in RC? (& of course the other transformer wire in the c slot)
@@anon-4419 so I’m no professional but I did a lot of trial and error and searching online. For the last 11months I have been using the 2 thermostat wires from my boiler to Rh and W1 and then my 24v transformer wires are going to C and RC. This guy has another video where he goes into a little more depth… m.ruclips.net/video/CCNIko3iZIE/видео.html skip to 6:40….
I did the same thing. I have a forced hot water/ radiant heaters, no fan or a/c. Mine was a 2 wire, and after following your instructions, it still didn't work. I added the low voltage plug/charger. The existing Red went to RH, the existing White went to W1.The transfomer wires went to C, I pulled the Red, and put the 2nd transfomer wire to RH. The furnace would'nt start. So, I took the loose Red wire and put it in with the transformer wire to the RH port. And all works fine now. It's showing 200mA in the Technical Info setting. And the furnace turns on. Thank you, I would never have figured this out on my own.
Very useful solution. I followed the instructions and fixed my problem at ZERO cost - I ran a wire from the existing door bell transformer (also 24 ACV) located in the basement right below the thermostat in the dinning room above.
This is exactly what I was looking for - thanks 🙏
Thank you for doing this video, Google Support would not help unless it was their C-Wire adapter. Following along with your video I was able to get this going. The only issue was I found out that I had to connect Rc or Rh wire along with the transformer (adaptor) wire to make it work.
This was the only change that was needed and once I got this done. Everything worked like a charm.
That was incredibly helpful. Thank you!
For those with a Nest E thermostat that the transformer didn't work for them, I found a solution that works for me. When I pulled the red wire and put the 2 transformer wires in "R" and "C", the furnace fan wouldn't turn on although under "equipment" in thermostat settings showed that it was working. In desperation, I put the red wire back in the "R" hole along with the transformer wire, and low and behold, the fans work and shows under "equipment" in settings as working as well. So basically, I left all the wires in original spots and then put the transformer wires in "C" and "R" (along with the original "R" wire.) Let me know if that worked for anyone else.
Ralph Simmons THANK you man! I tried this fix in the video and it took my whole system offline. Using your trick worked and saved me at least $100-$200 in service calls.
Ralph thanks for sharing the helpful information!
One Hour Smart Home I was reluctant to try this but it 100% was what my system needed. R wire from the furnace was needed. Added one of the transformer wires to it and the other to the C and nothing blew other than sweet sweet room temperature air.
@@chrisscottlynn Glad to hear it worked! Thanks for the feedback and informative comment.
Thank you so much!!
Thank you so much for your great videos. One adjustment I had to make was, the transformer wire went to Rc and C and the original red wire went to Rh. Then it worked.
Your videot gave me the confidence to do it myself. However, like some have commented, I had to leave the rH wire in place in order to get it to work. Thanks again.
This was incredibly helpful and easy to follow. Thank you.
You're welcome.
@@OneHourSmartHome without my red wire, my system wont kick in. Help me
@@tonnyygames5976 hey how are u? Mine does not kick in either what did you ended up doing 🤔
I thought this would get me through my latest Nest obstacle, but it didn't. The Nest says everything is good to go, no error messages, but it's not turning on my cooling. Your videos are good. I've learned more about HVAC than expected.
Excellent video. I don't even have Nests, but Emerson Sensi's that I'm trying to make heads or tails of in an old house where I've got 2 wires to one thermostat, and 4-5 on all the others (argh). You explained clearly how/why the 2-wire will need that third. Thanks very much :)
Thanks for this information and presentation. Very easy to do. Only issue was that had to connect the R together with the power adapter R and problem solved. Any other way the Nest didn’t recognized the power adapter. 😎
Thanks for the helpful video!
I rarely ever comment on YT videos but I want to say, you are awesome!!! Local company came out and hooked up my AC after I had it moved and had them install a Nest 3 gen. Could not get anything to work, no power on the Nest. I almost did this myself but was worried about 2 wires connected to the common at the furnace. They needed to come back today and told him about your fix. He was skeptical and thought I needed a new Nest. He redid the wiring and BAM!!! Fixed. Thanks, you saved me hundreds of dollars!!!
That is awesome! Thanks for your support!
thanks this was a life saver Im not able to acces my furnace cntrl board because the unit is up on a 3 story roof and thats too high for me. but this kept me from doing that and Returning my Nest to the store because I really like it .
Thank you for the video. I am having issue with Thermostat not getting enough power. Since it is winter and my furnace is gas-powered. I ended up contacting Nest E customer support.They recommended me Un-hooking the Y wire. until summer starts and I needed A/C again. Permanent Fix i was told hooking up C wire to the thermostat.
Great video, thank you, I am struggling with no C wire going into my unit. Just bought a transformer and will let you know if it worked. Thanks again. Cheers
Good stuff. Thank you for the video.
Thanks glad I could help!
Thanks for putting together this very simple and easy to understand video and links. I have now purchased the nest and the transformer. Just one question. Your link for the transformer on amazon did not list the transformer you had in the video but others showed up that said would power a nest thermostat. I purchased one with good reviews and am keeping my fingers crossed.
Hi James. Thanks for this video...saved my butt! It took a bit of reading down below, but in my case I had to keep the RED wire from the wall in RH and put the other Transformer wire into RC & C. Whew...the school of Hark Knock learning. Got you a cup of coffee too. Thanks much.
Hi, thank you for posting this video. It made it very easy to install a power adapter to my Google thermostat
Thank you. That was really helpful 👍🏼
Decent fix, only 1 issue that could surface. Not all a/c contractors pass through the drain pan safety float switch with the yellow(cool) wire, sometimes they break the red. So if your drain lines get clogged and your pan fills up there is nothing to cut the power to your condenser. Just make sure your float switch breaks the yellow or condenser wire before you do this or you could possibly have water overflowing into your ceiling.
Thank You for the video. I had been wondering if I could just add another 24v transformer right beside the 16v doorbell transformer and this video appears that it would work. I also thought about running a new c wire from t stat and tie it in the the heating valve actuator common wire in the boiler room.
Nice video. I will add comments about my install attempts as they go.
Wow! So you don’t need a professional to rewire your boiler! I’ve been trying to figure this out for a while and you solved the problem!!!
Helped me twice today clear and to the point awesome. Used the 2 wire connection to my reznor in the car hole can’t find the link or description to this adaptor?
Thanks for a great tip. I was trying to install a Ecobee 3 Lite thermostat, but it kept rebooting. After several days of struggle, I finally got through to customer service. After a few hours of troubleshooting, they verified that my wiring was correct (I do have a c wire), and it most likely was a power problem. I was reading 25.6 volts but was informed that might not be enough under load. Your tip fixed the problem. Maybe this can help someone else having the same problem.
Hello. So how do you fix it? How to increased volts?
@@angentle9724 It's not a voltage problem, but an amperage problem. My system is 30 years old. The 24v transformer was probably weak or undersized. Piggybacking the extra transformer did the trick.
This was so helpful! than you so much
Nice hack. Personally the need for a semi-local outlet precludes this for me, but this is a great option. Nice vids dude, keep it up
You don’t need a local outlet to the thermostat. If you have 18 gauge thermostat wires running to the thermostat from the heating/cooling system, you can plug the transformer in next to the system and connect the two wires to the existing thermostat wire that runs to the thermostat. The wire is usually 18/5, so there should be some unused wires.
Hi, I wonder if the furnace will ever go on with Rh from the furnace not connected? Maybe your house has a cooling only system?
Good video. Thank you
Thank you. This was a great tutorial!
You are AWESOME! Thanks.
Thanks, most of the other videos suggest you get an adapter and connect it to your HVAC, however like a lot of people, my unit is on the roof of my 2 story house and my roof is not flat . I'm definitely not going to do that!
Thanks for sharing
You may have answered this question already I have a 12 V heating system if I do this fix will it stop doing the delay start? Thank you for all the great videos
Most thermostats feature a delay start setting intentionally to protect the compressor from damage between mode cycles.
Great vid
Thanks
Thank you for this help!
This is a very good video. But, I do think you will need to do some update at least in the description.
Adapter is providing current to Rh from different loop than R from furnace. If you let the original R wire floating (dangling). Some machine won't work if the machine measure the 24V from it's R to ground.
Although Nest doesn't recommend to add two wires in one terminal. But, I agree with some of the comment below, you will need to add the R wire and +24 from adapter together at Rh or Rc.
Can I use that transformer in his link and hook it up to C and R? My 2020 model Nest doesn't have Rh or Rc. 😔
thanks for your help. --hooking up transformer to power NEST--most directions are unclear as to whether or not you unhook the red thermostat wire from nest which goes to boiler --the answer is yes --you unhook it and put one of the leads from transformer on R on NEST. Thanks for the clarity.
Thankyou, very well explained........will it work if we add only additional C wire from nest to the furnace board, keeping the green wire the way it is connected......without changing or touching anything else.....Thx
Thank you soo much, helped a lot. Only real pain, I bought the wrong nest.. should of went the gen3 which only needs 2 wires.. My newer nest needs the dumb adapter :(
Thanks for the informative video, instead of the plug in transformer an I run an 18 gauge wire from an existing 24 volt transformer right to the C terminal on the Nest and leave all other wires as is?
I have a Weil Mclain gas boiler and the first floor is on separate heat zone only. I have a nest learning thermostat upstairs which is powered by my AC unit in the attic. I installed the new Nest Thermostat downstairs and used this wire transformer. I had to connect the second white wire to the R wire coming from the thermostat and connected both to the R terminal to get it to work.
I don't have a C wire and will be running one like you showed but I have a RH and RC wire attached in the RC and RH spot. Would I then connect one of the transfer wires with the wire already in the RC spot and the other in the C spot? I've been searching online and thankfully came across your video which is most close to my situation. I greatly appreciate any help you can offer 🙏
Awesome video! I installed one upstairs BUT there is an issue downstairs. I have a low voltage thermostat but the wires are really thick gauge. They do not fit the Nest. Why are the wires so thick if it is a low voltage thermostat? thanks
Good explanation. Thank you
QUESTION - First hi and thanks for the video. I have three Nest thermostats - two work great - they only control heat. My third Nest controls heat for the second floor and the whole home AC. This Nest is constantly losing battery during the summer. The heat and AC are separate units and the wiring to the trouble Nest is the following; heat white wire - W1, heat red wire - RH, Air red wire - RC, Air green wire - G and Air white wire - Y1. I’m hoping an AC adapter will fix my constant low battery problem in the summer. Do I need to make any changes to the Air wire set-up, or just hookup the AC adapter as you suggest? Thanks.
I don't have an outlet near any of my 2 zones thermostat. Any solution?
Hey One Hour Smart Home! My nest thermostat currently has an RH wire going to RH terminal. Can I use this adapter and only use 1 of the 2 terminals in the C terminal? Or should I unplug the current RH cable and plug both terminals from the adapter in?
Hi, first thank you so much for your very interesting channel, it has very good ideas on how to keep yourself up to date, my name is Carlos from Mount Vernon, NY. The reason that I'm writing you is about a video that you posted "How To Install A Common (C) Wire", it seen pretty easy to me, but I'm a little confused still. I have a Navien boiler 240E for heating and Rheem for the AC, since November of 2019, I went on a Nest thermostat, because of you and your great review, but I have no C wire, and due to that when the heating is on, the air handler goes off and on constantly. Now, going back to your video "How To Install A Common (C) Wire: The Easy Way", my confusion by using the adapter or transformer, is that you said in the video to disconnect the RH to connect the adapter to it and the common C section for the Nest, will my heat work after having one of the two wires disconnected?
Please whenever you have a chance reply to me, so I can get it going the right way, right away!!
Once again, thanks for keeping us updated!!
I didn’t do it the way he said if your using it just for heating u can u the Rc and common
Bro I have the same issue how did you fix it please assist a. Fellow new Yorker lol
Thank you for the detail. How about using venstar add a wire instead of getting a external transformer?
I tried Venstar add a wire on my system first and it would not function on my system though compatibility all read fine. I switched to this and it worked great.
Thank you for the video. I can't find the transformer by clicking on the link (I get a full page of different transformers, and I'm not sure which one to pick). Would you be able to provide more info on the transformer (brand, other specifications). Appreciate it.
It was an awesome demonstration. I do not have a Rc or Rh. What should I do? I removed the HVAC R wire and connected the one from adapter. It doesn't work. Please help.
My old thermostat had RH and RC connected together, with only 2 wires coming from the furnace , Red and White. Nest says don't jump those wires (RH and RC). However my fan constantly runs when hooked up the way Nest said. Even with the Nest thermostat unhooked from the mount the fan still runs. Would you suggest using the transformer or running a new common wire? Thanks
Thanks for the video -- it gave me some hope. I have a Nest Learning Thermostat that had its battery drain during a three day record heatwave when the a/c was running for long stretches. I have had the Nest for three years, and I never had an issue prior to this. Google told me to spend $500 getting a C-wire installed by a Nest Pro (they did not pitch the Nest Power Connector). I thought instead I would try this solution to prepare for the next record heatwave. When I plug the transformer wires into C and Rh, I get lots of power to the thermostat but the hvac does not operate, even though the Nest indicates the heat, a/c or fan are running. When I move one transformer wire from Rh to Rc, the same thing is the case. When I have the transformer plugged into C and Rc and keep the old red wire in Rh, I get the N72 error on the Nest. No combo works. Google states the Nest bridges between Rc and Rh automatically, so it seems like I need not try removing the red wire from Rh and bridging the Rc (with one of the transformer wires in it) and the Rh. Anyone know what I am doing wrong?
i want to know the same thing!
Try what Ralph Simmons recommended in his comment below. I had exactly the same issue as you and nothing I did worked.... until I put the R wire back into the original Rh terminal (along with one of the transformer wires). The other transformer wire went in C as the video mentions. And you are right that Google says the Rh and Rc terminals are connected, so I'm not sure why shoving two wires in the Rh terminal is any different then putting one in Rh and one in Rc. But I'm not gonna complain about it now that my fan is finally running again XD (Note that Google technically says not to put two wires into the same terminal because you could damage the terminal, so try at your own risk)
I have R, Rc, W, G and Y.... should the wire from the transformer go into the one marked "R" and leave the one coming from the furnace out?? Would really appreciate a response as my furnace has no clear markings (with letters) to find which one would be the "C" common wire that goes up into our thermostat in the main floor, thanks for your time and attention to this matter
I have been up and down through forums and videos trying to square the circle of why some people say a fan relay is needed and others seem fine without one. Some people hear their furnace hum and buzz until they put in a relay, others put in the relay and the system doesn't work. I have a millivolt gas valve hooked up to a thermocouple that when switched on powers the valve and turns on my fireplace. I hooked up a wifi thermostat with a 24v ac adapter, wired it up and everything worked.
The reason why my millivolt gas valve didn't overload is because my thermostat doesn't have a battery and so draws a constant 22-27volts from the ac power supply. I ran a multimeter at the end of the thermostat wire that hooks up to the fireplace and the voltage was in the millivolt range because the thermostat was pulling 99.9% of the available power and so there was only crumbs left to push to the gas valve.
My thermostat doesn't have a battery, and I wonder if (in units with a battery) when the internal battery is charged how much load goes down the wire to the fireplace and if that could overwhelm the millivolt gas valve. In my circuit the fan relay was not functional because the thermostat took all the voltage there was not enough to trip the fan relay. I took the thermostat out of the circuit and tested the fan relay with the 24v ac adapter it functioned normally.
The only concern I have is if the wifi thermostat fails and stops drawing power and the circuit to the fireplace is active could there be a chance that the 22-29 volts from the ac adapter gets shunted to the fireplace? The thermostat manufacturer seemed to think that when the unit fails all circuits are cut as a safety precaution. Would that be the case in a battery powered unit? I think I will install a small fuze inline at the fireplace so that it trips just in case the voltage gets diverted in the case of thermostat failure. Also to ensure that the fireplace works when the power is out I wired up the on off switch on the fireplace as a bypass.
Hope that helps someone!
edit: Thank you to everyone including the creator of this video who ran tutorials on how to install these systems. Having so many examples really helped me tease this out. It takes a lot of time and planning to put these videos together and that work deserves respect.
Chris, did you use a fan relay after all? I have a minivolt heater as well and would like to have it work with Nest Thermostat 3rd Gen.
@@vktse I want to say that I am in no way an electrician and this is based on a conversation with a technician and a theory. I did not use a fan relay. The thermostat I used consumed between 99 and 100% of the power provided by the ac adapter so when the thermostat switched to "heat on" and closed the circuit for the fireplace there was almost no voltage available to go to the fireplace and so made sure that I wasn't overwhelming the millivolt gas valve on my fireplace. I couldn't get the fan relay to work in the system because it required 24v to activate the switch and that voltage made available by the ac adapter was being consumed by the thermostat.
I would hesitate to use this on a thermostat with a battery because the small voltage from the battery could increase the voltage available to the system beyond the needs of the thermostat and push more than millivolts to the gas valve. You could use a multimeter at the the ends of the wires before they connect to the fireplace to confirm though that the available voltage at that point isn't above millivolt capacity.
I would also say contact the manufacturer and try to confirm that in the event of a thermostat failure the mechanism fails and disconnects all circuits. You wouldn't want a situation where the power is being supplied to the unit, but the unit malfunctions and isn't drawing power while the circuit to the fireplace is closed and then all the available voltage is being supplied to the millivolt gas valve.
I had a lot of luck calling the manufacturer and running ideas past the technician, and calling local electricians and fireplace servicers to pick their brains. They were also confused as to how everyone was diy-ing these thermostats without causing more house fires, it seems the pool of voltage being almost entirely consumed by the thermostat leaving only millivolts for the millivolt fireplace is the most likely scenario. The small amount of spillover available when the circuit for the fireplace was closed ended up being perfect for my system because the millivolts in the circuit weren't enough to travel to the thermostat and back. The last little umph made the system more reliable.
The RUclips comment section isn't the best place to describe something this technical so if you have any other questions let me know and maybe I could email you some diagrams.
I only have a furnace so I just have two wires, would I run the common wire transformer to the C spot on the nest and the and the RH spot? What do I do with the two wires for the furnace?
Can I connect my nest with my navien tank less water heater. The thing is running every 10 minutes night and day! It's supposed to be on smart mode. Thanks so much for your videos and your help!
Great content thanks
I did exact same as you show on this video but my nest#3 gen showed N79 error (no c wire power). I use voltage meter to check the transformer. It works fine. My house is duo system ( cooling got Y1 G and Rc ) and ( Heating got W1 and Rh ). Any suggestions?
If i already have a wire plugged into RC do I plug the adapter wire into RC still? Or into the RH that has the jumper from RC to RH
Thanks for the video! I got an ecobee thermostat but I’m renting a condo. I couldn’t easily find where to install the kit supplied by ecobee for when you don’t have a C wire and I don’t want to piss off my landlord. There’s an outlet on the same wall as the thermostat so this will work perfectly for my needs while I’m renting! Thanks again!
Glad to help!
I just wanted to throw this out there in case anyone tries this themselves. I connected the transformer wires to Rh and C but nothing happened. I found a thread on reddit where another ecobee user said to connect the transformer wires to Rc and C. I then connected my R wire from the wall into Rh. Everything seems to be working. Thanks again for the video
Great follow up thanks @Moniwi this should help other users solve their problems. Much appreciated.
Ecobee wants the R-wire to go to Rc unless you have separate Rc & Rh wires from the wall (not jumpered). Thus it would make sense to plug the transformer wires into Rc & C for power and the wall R-wire into Rh for heating. (Not sure about cooling.)
@@breakdance92 This definitely worked, thanks!!
I would like to do it at my furnace and have one extra wire to the thermostat already. I am sure I could use that as the common or C wire but if I do it at the furnace do I tap into the red one there ? I hope you see this and btw I love your videos !
At 2:35 where does the RH wire from the wall connect to now?
I have 4 thermostats (zoned heating).
Could I use one transformer to power multiple thermostats (proximity for wiring is not a problem), or do I need a separate transformer for each thermostat?
I have a heat only furnace system controlled by a mercury switch. Two black wires from the wall. Where should I out them on the nest? W1 for heat and the other??
The video helped, but I have a nest that does not have an rc wire slot. Very simple heat only system. I bought the transformer and hooked it to the red on the thermostat along with the red coming from the heater as other videos advised. The other wire to the C terminal. Only issue is that I keep getting messages via email that I may damage the thermostat by using a transformer such as the one you installed. Did I do something wrong? THanks for any help!
Hi ya. Hope all is well. I've watched several of your videos in regards to the Ring security system. I apologize for this being off topic, but they influenced my decision in getting one for my home. I also bought a Ring Doorbell 4 to go along with it but due to the holidays, it's arriving later than the security system. Trying to think ahead, I've looked at the power requirements for hard wiring the doorbell 4. On the Ring web site it says the doorbell 4 needs voltage of 8-24 VAC, 40VA max, 50/60Hz or 24VDC, 0.5A, 12W is required. Would you know if this C-wire adapter will work to hardwire the doorbell 4 for a home that isn't plumbed for a doorbell already?
My gas steam boiler has 2 wires white and red.
So would I put white to W1 & red to RH and then the transformer to RC & C?
I have a heating and cooling system but i see in the furnace that the wire is split until the Y and C and of course my Nest is not powering consistently. Can i use the Y wire and as the C wire?
A Quick Additional Note: Check to see if there is a C/Blue wire in the wire bundle. In my home, I found that the installers cut the blue wire to the point where I could not see it. I dug into bundle a bit deeper and found it. YES!! So I wired it up at the thermostat and in the HVAC unit. From 20 mA input to 200 mA. Success!
I gained a tremendous amount of knowledge watching this video. It really raised my confidence when modifying the wiring behind my thermostat and at the HVAC board. Thanks!
Where did you connect it in the hvac unit?
Don't forget to mention that you should always unplug the HVAC unit first before hooking up thermostat wires etc. so the control board is not energized or you run the risk of blowing on-board fuses, capacitors or other electronics, been there done that! It'll save you a huge headache or a $200 bill in parts!
I have a Nest E and it has now stopped working. It will show the current inside temperature on the Nest and the set temperature but will not turn on the furnace. After turning off the power, I took off the Nest E, disconnected the wires and jumped the wires to temporarily by-pass the Nest and the furnace turns on after turning the power back on. I would like to use the Nest E to monitor just the outside temperature in my garage via the app since it is not working properly to run my houses systems. Can I use the method that you talked about by using a transformer to power up the Nest E and use the app to see the temp in my garage?
Thanks for the video. Thanks for your help in advance.
This worked perfectly for my Nest 2020 with a one extra Google session because I didn't know where to put the wires
The new Nest (2020 glass front) only has one R port. What would the wiring diagram look like for this? Can I plug the R wire from the boiler and one of the transformer wires into this one port?
My RC and RH terminals are bridged. Should I bridge them in my Nest thermostat and connect 24V white wire from power transformer to RH?
I need help I have the transformer and my google nest is working fine thank you so much but here's my question does plugging in this transformer increase the electricity because until my thermostat started working I had to plug in a 1500 watt heater for 10 days because I couldn't get the nest to work so I don't know if the heater increased my electric bill $140 or this 24 volt C wire could you please give me some insight
Aha, I've got a red wire connected to Rc, but no wire connected to Rh. I guess that's why the unit stayed charged during the summer when we moved in but lost charge when we switched to heating the house. I'll try the recommended transformer and hook it up to C and Rh. Any problems leaving the Rc hooked up as is when I add the transformer? Thanks-
Trying to install the nest thermostat in my rv . It's a permanent rv and uses 110vac .
Heating and cooling are 2 separate units controlled by 1 thermostat . 3 wires for ac and 2 for heating . If I remove the rh wire to install the transformer , won't the heater stop working ? .
I followed these instructions and my upstairs heat does not work at all. I have 2x nests one for the upstairs and one for the downstairs. I currently have rh, c, w1, g, y as my wiring. Downstairs has the same exact setup except it has a common wire however our upstairs does not and the heating/AC works fine. I have baseboard radiator heating, with oil/boiler as the heat source. For cooling we used central air cooling with an outside unit. Doesn't make much sense to me with the same exact wiring setup why it doesn't work. If I plug in the old thermostat it works fine. The old thermostat I had was a Hunter Energy Monitor II Plus for the upstairs and downstairs we had a Honeywell Chronotherm III. Any help is much appreciated.
I have 4 zones in my house. We also have a two wire heat only boiler with forced hot water to baseboard radiators. My question is; If I were to install this transformer or a traditional transformer of equal power and pull new wires from the thermostats could I power all 4 nest thermostats from the one transformer?
I have multi-zone oil heating. My current TT has 4 wires coming in but only the Red wire is connected to "R" and the Blue wire connected to "W". My Nest TT has Y, C, W, G, R and *OB terminals. I have two spare wires which I can connect to a 24V transformer at the other end. So, one can be connected to the "C" terminal but not sure where the other lead of 24V wire should be connected. Please advise. Thanks.
This was super helpful but I have a question. I got a ecobee smart thermostat and will connect it with the transforme. One wire goes on C and the other goes on RH or RC?
Totally agree first he says Rh and in the end say Rc.
Hi, thanks for this info and all others' smart gadgets, I have a question, and my AC coes do not have a common. My nest only has 6 ports ( Y1, G, R, W1, C, *OB), and only the common is open. My nest drain every year, so I charge it, I try this the other day, but I think I damage the capacitor. I am in FL, no furnace, only electric heat on aAmerican Standards/ Trane. How can I connect this power transformer? Since the red has power all the time, can I use it as a common?
Thank you for the video just a quick question what do I do with the wire that was connected to our rH previously ? do I just cover it and let it loose?
Did you ever get a reply to your question?
Hi, Thanks for the vid but wondering if you could clarify for me on my system. I had only a 2 wire system for forced air and both were the same colour. I found a you tube vid on a 2 wire installation and it generally seemed to work but having the issue with clicking and turning on an off rapidly. I currently have a wire in the W1 and R terminals. My nest has a W1, C, *o/b, R, G, Y1. If a transformer would solve the issue could you tell me which terminals the existing wires should be in and where to connect the transformer?. R and C I assume but just want to be clear. Thanks!
Did you figure this out? I have the same problem.
I do not have furnace system, I live in apartment. I have regular, if I purchase common wire as you mentioned linked from Amazon, if my AC/heating system already occupied RH, can I connect common wire in RH? and second one at C? I am not at home, I am going back tomorrow, I will see exact diagram. I have issue with Low Battery al the time.
Will this trnsformer work with the new 2020 Version of the nest thermostat? No the learning one, the regualr one
I keep getting 'Delayed' too often.This may do the trick.Thank you sir
Hi fantastic video can I do the same with the Wyze thermostat?