Nest Thermostat No C Wire Problem and Solutions
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- čas přidán 17. 04. 2020
- Common problems with the Nest thermostat, what causes them, and how to fix it. The most common issue with a Nest thermostat not working right is causes by the lack of the C or common wire. In this video I go over 3 methods of fixing that problem.
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Superb! 3rd method works well, thanks so much 👍👍👍👍👍👍👍👍👍👍👍🙏🙏🙏🙏🙏🙏🙏🙏
Question? My unit is wired ok but I call for cooling and the condenser gets a bit but never runs. I check for the 24v. We do have the 24
@@samayala7636pi😅
@@samayala7636k m m bbl
Can😊
OMG I DID IT!!!! I was *terrified*…. I have never done anything like this before. Electricity and wires scare me so much! This was one of those things I would have happily paid a professional a hundred bucks to do, but I decided to just see what it was going on “under the hood.”. So I shut down the power main (I wasn‘t taking any chances!) and opened up my old thermostat. Then I unscrewed it from the wall, and sure enough, I had no “C” wire. UGH. I found your video, and it’s so thorough, I went ahead and disconnected the wires, and did exactly as you said, putting the “G” wire into the “C” port. The terrifying part was opening up the furnace (in the dark, with my phone as a flashlight while also trying to replay that section of your video over and over. It was comical…). I found the control panel, and did exactly what you said… I kept having to calm myself by saying “you can do this… people do this *all the time.” I literally felt like I was diffusing a bomb! Like if I did it wrong, the house would blow up once I turned the power back on! I closed up the furnace, and turned the power back on, expecting the worst. I went back upstairs, and the Nest was all lit up and ready to program! We ran through testing the A/C - and to my shock, it came right on, blowing cold air. I DID IT! I am feeling really proud of myself for stepping *WAY* out of my comfort zone!!! People, if I can do it, literally *anyone* can!!! This video is essential if you find you don’t have a “C” wire!!
I'll give that a year, maybe more before the stat head goes blank. I'm an HVAC tech as well. I don't use the word hate very often, but I hate the PEST. You want a good, reliable WIFI stat, go with an Ecobee.
I'm ok with the wiring if I could just find the C port and know its the right one. Not so excited about the notion of the house blowing up once I turn the power back on.
Now if only I could step out of my comfort zone and go out and socialize more 😅
@@reedscuba I'm assuming thats a word play on Nest? Sorry not enough coffee this morning. I was talked into one of these with a rebate from my power company- even though the one they sent me looks like an Avon makeup case (its pink with a gold reflective top and "no Returns" of course).
It looks like something that would be in Smurfette's house 😆. IDK
I don't need to run my thermostat through my phone, my phone already has 10,000 trackers they don't need to watch my heating habits too lol. The only thing I like is the clear color display.... but that shuts off every time you walk away! So no seeing the temperature from across the room.
Why do you hate them?
Congratulations 🎉 I love this comment
You’re a real lifesaver! The way you explain and your reasoning are straight forward and easy to understand. You just saved me from returning this thermostat. Thank you so much!
The last solution solved my issue with my Nest install! I echo the other comments in regards to the video being easy to understand and being so clear. The visual of the circuit board in the presenters hands really helped communicate what needed to be done regarding the rewiring. Thank you for saving me the headache of running another wire throught he wall and not needing to try the Google NEST power connector device for $25!
This was so helpful. My AC condenser kept shutting off when the house was not cold yet. Hooked up the C connection at both ends and we have constant cool air, got lucky extra wire was there. Your Capacitor troubleshooting and replacement saved us last week. Thanks for the excellent videos.
Just had my first experience with the nest on a new furnace I just installed. The fan would run non-stop. Seems the power robbing caused the electronics to think there was a call for AC. Very frustrating - even taking the stat off the sub-base, still the fan stayed on. Threw me for a loop, until I removed the stat wires from the furnace and the fan stopped. ALLWAYS find a way to get a common wire to the stat - it will save you a nightmare later on. A note on moving the green wire over, then the fan switch on the stat will not function if one just wants to circulate air, but will let the AC and Heat work properly (Don't forget that jumper). Nice video - well done. 40 years in the trades seems like there is always a way they make things difficult on us.
Can not thank you enough for all you sweat in your attic and gained knowledge that you so kindly shared. We just had this happen and you fix worked like a champ. Yes we had water in the tube, shopvaced out the water and now we have AC again. Thank you thank you kind sir.
Thank you and thank you. The 3rd option you mentioned in the video is what I used in fixing the problem and my system is up and running well without any issues. Thank you for saving me the money to call in a HVAC professional and the whole process of fixing the problem is not more than 10minute
Nice video. I originally thought I had only four wires on my old Honeywell thermostat. I checked my HVAC/central air and saw another wire. Went to where the Nest thermostat was and pulled more wire out of the wall and there it was wrapped around the main wire. Problem solved. Hooked both up to the C and it works fine. I hope more people see this and it helps them also. Thanks again.
Thank you very much! I have a 3-wire system and hooked up a Nest a couple of weeks ago. Was getting a N260 error. Batteries died quickly, was losing connectivity to my WiFi. After watching the video I put the g to c and immediately fixed my issue. I did not have to make any changes to the Phone app. Once I plugged the furnace back in and reconnected the Nest I was back in business. Thank you!!
I’ve moved from an ecobee to Nest, had 4 wires and a 4 to 5 wires adapter in the furnace.
Whether I run Heat or Cool mode, both AC and Furnace used to run at the same time.
I’ve removed the adapter and followed option 3.
Now everything is running perfectly.
Thank you so much for the video.
Glad I watched your video before making an HVAC service call. My a/c has been short cycling this season (after installing a Nest thermostat last winter). After watching a couple of your videos, I bypassed the thermostat to test the a/c without the thermostat and the a/c didn't short cycle. Found that my thermostat wire had a common (blue) wire hidden back in the wall and followed the steps on your video to add it to my Nest thermostat and to my furnace control board. Problem solved! The a/c is no longer short cycling! Thanks!!
Thank you so much! My dad and I could not get the thermostat connected, Option 3 worked perfectly. You are a lifesaver!
Geez. So happy you are there showing the how to! Watching you will give me all the confidence to do it myself! Excellent presentation. 😏😁
Thanks so much. I used your 3rd method with Honeywell Wi-Fi touchscreen thermostat. It also needs a "C" connection. It did the job.
Thank you so much! Found the c wire hidden in my wall and didn't need the adapter. I really appreciate your video!
Thank you! My C wire was just disconnected at the board. Easy fix after too much frustration before I found your video. I really appreciate your help!
You're welcome! Good to hear that you found and fixed the problem!
Thank you very much for a quick and clear overview of the wires, purpose and how to add the common C. Luckily I had the fifth wire tied with the stem so that I did not have to move the G to C, nor run any additional wire. You saved me money and from a biting cold night. Happy holidays!
Thank you so much for this video, easy to understand and straight to the point, just bought the gen 3 for my sister and was successfully able to wire it in because of this!!! So we both are grateful for such an awesome educational video! And she can now contol her ac away from home and couldnt be happier!!! Thanks broski! 🤙🤙🤙
Holy Sh!t, that worked. And so, so easy to understand. Thank you for breaking it down to the lowest level. And here I thought HVAC repair was so complicated and required a technician. Excellent work my man.
Great information, thanks for keeping it so simple that anyone can understand.
Thank you! I appreciate you making this video! My Trane furnace had blue wire disconnected, but it also had a Honeywell three zone device for three thermostats in home. I had to connect the blue wire to the B/C terminal in Trane xv80 furnace, AND also connect the blue wire to the C terminal in the Honeywell mini-zone box too.
Awesome video!!! The 3rd method worked perfect for me. I have a 3-wire furnace (Heating only system) (R, W, G) and I simply re-purposed the Green wire to a C wire per the video and Viola! I then had to remove and re-add the Nest Thermostat within the Home app and then tell it I now had R, W, C wiring. Before this fix I had even installed Nests "C-wire Power module" inside my furnace which didn't work and ended up tossing it with this fix. Thanks a ton!!!
Please keep making HVAC videos. I know everything else except this and welding and I understand it the way you teach it. Thank you for making these videos.🤘
Thank you! I was about to throw my Nest away, used method 3, and voila! It's working perfectly, thank you again
Thanks. My AC unit is Duncane made by Amana. When the unit was installed three years ago we got the NEST 2nd gen, a few hours later started making some bang loud noises. We replace the NEST for a regular Thermostat and the problem stoped. A moth ago the old Thermostat was bad and was time to get a new one, we got the NEST 3rd Gen, and again the bang loud noise came back. I went across your video, I did the option of green going into C wire with the jumper of the Y and G at the unit. So far I haven’t heard any more bang loud noise. One more time, thank you.
Great video with excellent technical explanations! Thank you!
Wow... we bought Nest a year ago and for past couple of months it sudden decided to drain battery over and over. We ended up manually charge the Nest over and over, when we charge it, few minutes later it said to put it back in the base... then to drain again next day??? Very annoying and then this video saved us some headache! We switched G wire to C and that's it! Thank you!
Same here... all of a sudden the Nest battery would drain twice a day (while negative 15deg outside!). I used the common wire swap, and found a length of wire from an old landline phone wiring and set up a jumper. Thanks again this was a huge time and money saver!!
I changed G to C on both the control board and thermostat. I then jumped Y to G on the control board, removed batteries from by T-stat. I now have a common wire, thank you.
This makes more sense to me than the other channels that I looked at.
Im a car guy i always use youtube for that but this time i used this video for troubleshooting my nest, it was perfect thanks for the help.
I was doing research on the lack of a C wire on my Nest thermostat since I noticed the battery is always low and thank god I watched this video because I also had the C wire wrapped around the rest of the wires behind the thermostat and didn't realize it. I was getting ready to take apart my furnace and buy one of those adapters! Thanks man!
Definitely thought I could use the G fan wire into the common, so thanks for verifying my thoughts. Good info 👍
Thank you so much! You saved me a service call and heaps of frustration.
Brother I need you to do this in my house. AC guy quoted me 350 to 400 to add this C wire. Says electrician will charge 500. You save me bunch of headaches. To me, the g wire n jumper seems viable. God bless you.
Thank you so much. You are the only one with good advice. 120%
My unused C wire was exactly as shown, wrapped around the cord. Thanks for the video, helped a ton!
Thank you for the frustrating tidbit of info I lacked!
The 3rd method worked for me. My brand new house (when it was built in 1994) had two lines of two wires each for a total of 4. I was going to just run a "C" wire and bind it to the other two lines, but I decided it wasn't worth the trouble if the 3rd method would work. Thanks for the very helpful video.
This is an AWESOME video. Thank you for this!
V Great information, thanks for keeping it so simple that anyone can understand!!
For the Nest thermostats that I have installed the "power stealing" feature has worked fine. Good to know about the potential issues associated with systems that don't have a common wire.
They don't always have problems but I have seen many that did. Thanks for sharing your experience with them Ben!
I'm pretty sure the power stealing feature has short cycled my furnace and has caused it to not work
@@leeroymlg4692 I'm having that problem right now after 2 years of it working fine. Going to try the C wire, but need to run one first.
@Mario G I just for the first time in this house that we moved into 3 months ago tried to run the furnace this AM with the Nest I installed and it's making the furnace short cycle. No common wire but it worked fine with the old "dumb" thermostat. I guess Nest thermostats are just particularly sensitive to this? It's been able to run AC unit just fine.
Whenever I use the power stealing ive found that the thermostat act irregularly and can even cause the unit to short cycle after a few months. This is likely due to the flocculation of current through the fragile controls of the nest thermostat.
Very helpful, video, thanks. Saved me a lot of aggravation & was able to find the Blue C wire to solve the problem.
Nice ..!!pls more trouble shooting solutions or maintenance for wall air condition ..thank you for what you do , take care👍👍👍👍
That is just what I needed. Much Thanks!
You’re doing God’s work my friend. Thank you so much! 3rd method worked perfectly! 🙏
Love to hear that! You're welcome!
Excellent. Your explanation is succinct yet comprehensive to solve this problem. BIG THANK YOU....
I changed the wiring per your instructions to have power circuit using C wire. Not having separate fan control was not important to me. My Question if you can answer:
On my furnace I found additional wires two wires connected. I believe they are connected to the Air Conditioning compressor. i did not change anythng there, just did exactly what you suggested including jumper from G to Y so AC when turned on will turn the fan on as well..
MY Q is did I do this fix correctly? I would appreciate your answer. Thank you in advance.
I also repurpose the fan wire for my customers. Nice video!
Excellent video!!
OMG YOU ARE A GENIUS!!!!! I’m a hero to to my family now🙏🏾🙏🏾🙏🏾🙏🏾
Thank you so much for this video. My nest has been working fine but out of nowhere it will give a low power signal and it will stop working and out of nowhere it will start working. Luckily my c wire was wrapped around just like you showed on the video in my furnace.
Thanks again great video
Thank you so much. Worked like a charm.
freaking brilliant video man! keep up the good work!
Thanks, I found 6 cables for my wall, They just left common hanging on both ends. Wired it and hoping for the best!
Very informative video, Thanks.
Best explanation ever!! Good job sir
Thank you for the explanation. After watching your exceptional instructional video I was able to run a C line from the thermostat to the source and now my system works perfectly. 🙏🙏🙏🙏🙏🙏
Totally helped, thank you! G as the common, I don’t use the fan anyways. Time saver.
Great video. I just connected my C wire and problem solved!
Your explanation made so much sense
Outstanding video!
My furnace does not have a C terminal but I had unused wires in the thermostat cable. It does have a terminal labeled “24V” and after some research I found I could add the C wire there. Everything is working great. Thanks for the video!
Thanks a million your video and information are just GREAT. I did it by myself. I was having issue the nest thermostat didn’t have power and I just follow your instructions connecting the C cable that wasn’t connected to the Honeywell. 🎉🎉🎉😅
very useful video! Good job buddy! detailed.
Thanks for the video, I've been having problems with my Nest Thermostat E and this might be it.. will try it out tonight!
It didn't work... Nest still won't turn on when attached to the wall.
Edit: it worked!! I had to charge it with a micro usb cable for a while then the screen lit up and I attached it to the wall. Also, I had to close the furnace panel door (duh) for it to get power
this was really helpful, i probably safe me lots of money whith this video, thankyou very much.
Jay, your videos are very informative and correct thank you for sharing. After many attempts to fix my hard starting problems I followed this video, connected the C wire and problem solved. This was the solution all along despite Google saying the C wire is not needed.
Yeah, I thought C wrie was NOT NEEDED???? WTF? Annoying fukken ERROR after installing Nest! WTF? So why does it use 2 batteries???
Bro I really have to say, this was one of the best and concise instructional videos I’ve ever watched. I felt the need to comment and applaud you for making such a high quality, easy to follow video 🤜
Great to hear that you really liked the video! Thank you. I appreciate you taking the time to leave a comment, stay cool this summer bro! 🤛
This is the way CZcams how to videos were before all the ads and everyone trying to drag videos out to 10 min.
Thanks for this. I initially changed my G wire to the C. Then I noticed that there was an unused Blue wire. I switched the G back to G, connected the Blue to G on both and voila, it worked. Thank you!
I don't get it
I out g on c and now I have blue G desconected
@@javiergomez8070 sorry, I mis-typed that I connected the Blue to G, I connected an unused Blue to C.
@@javiergomez8070 G on C will work.
THANK YOU!!! I thought I could use the extra black wire (method #2) and since my electrical knowledge can fit in a dixi cup (half full, not half empty) you saved the day for me. I would have just hooked up the extra black wire, thinking it was a common and called it a day.
Great Video, Thanks!
very helpful thank you. I luckily found a spare wire that I wasn't connected to the board and will use that as a C.
It depends on the length of the cycles. The battery won't charge without a difference of potential across the coils of the control relays when they are not in use if you don't have the "C" (common) wire. That isn't enough if the thermostat is also energizing the relays in the furnace for long cycles.
The adapter didn't work for me. The batteries in the thermostat still died after a few days. I ran a new 5 conductor wire from the furnace to the thermostat. It has been working ever since.
I wish I had seen this video sooner. It would have saved me the trouble of running the new wire. Using the G wire for a C wire is a good idea. You only give up the blower on constant feature, which we rarely use anyway.
Your videos make others think I know what i'm doing! Thanks for all the awesome and concise info!
Thank you! It works for me very well!
Hi J! Thank you soooo much for your video and insight on Nest thermostat. Your video was so helpful to help me fix my issue. My problem was my Air-conditioning was not being recognized by my Nest. From your video I realized that my Y wire not connected. I took your advice and cut a piece of extra wire from the furnace control board and made a junction wire to connect the Y to the G and now my AC works! Thanks again!
Thanks for saving me money. Very helpful video from an HVAC PRO.
Hi thanks for the advice found the 5 wire wrap around the harness near control board and the thermostat
This saved me so much headache! I actually had 2 extra unused wires!
Looking good buddy 👍 I like the cap.. you are a wealth of knowledge my friend. I'm glad to see you are doing well and I continue to pray 🙏 that you and your family are safe.. have a good one buddy 👍.. me and Arnold and bigfoot are watching you now.. it's cool here today and rain last night..we are in what is called snowball winter..all the snowball bushes are in bloom now...we have one more blackberry winter.
Nice! It sounds like a beautiful scene is unraveling over there. Good to hear that you, Arnold, and Bigfoot are doing well too! I hope you enjoy it to the fullest. Thank you for watching the videos David! This last Sunday we had very bizarre weather here in Minnesota. It went something like this: Snowstorm then sunny and snow melting, then light snow again and cloudy, then sunny and clear, then heavy snow again! I've never seen it snow and be sunny at the same time. This was a first.
@@WordofAdviceTV we have that kind of weather here Jay, there is a old saying in Kentucky it goes if you don't like the weather just wait around and it will change. I was out building a porch on my outbuilding last week and it was sunny and all good you know so I took a minute break to come in and get something to drink and I wasn't in the house nomore than maybe three minutes and I heard like rocks hitting the window seal and I went to the front porch and it was hailing the size of marbles..it lasted for a few minutes and it went from being warm and sunny to cold in a blink of an eye.. that halted my work for the day.lol. But I was right back to it the next day
David McKinney Oh well that's interesting! Turns out that is a normal occurrence in some places 😀 I'll have to remember the Kentucky saying, thank you for sharing the weather changing experience! 😄
You are my hero.
This was by far the best video on the subject. I was trying to figure out how to search for (if you have an unused green wire you can make it a C wire)
Great video but what if my furnace box doesn't have a C connector?
I hooked up my green wire to the White wire that is separated on the wall marked C and NEC. The red wire is in the R terminal labeled LOAD
My Nest thermostat now reads 209 Watts.
but it doesn't think I have a C wire hooked up still.
Am I going to accidentally burn my house down?
Nice video..Thank you.
wow, very helpful!
Tha k you so much this helped out a lot
Thank you!
Nice try! I found a blue c wire behind the the thermostat so was wondering if I could find a blue as well connected to the furnace chipboard, but I didn’t see one like it. Then I stripped off the wire wrap that covers all other wires. When I cut the wrap down a bit and noticed there was a blue wire wrapped with other wires but underneath the wrap. I then connected it to the C terminal on the chipboard. This works. My nest thermostats now have the power from The blue C wire all the time!
thank you 👌
I found my Nest did not have a C wire attached yet there was one present in the thermostat wire. I stripped and connected the blue wire, went to the furnace found the C wire wiring block location and hooked up the wire. Problem Solved! Thanks!
I switched G to C on circuit and Nest and it works! Wifi eats up AAA batts fast so this solved my power issue, thx!
Very well explained. I have a low battery problem with no C wire connected. Will connect C wire and see if it solve low battery problem
So do I hook my extra wire to the transformer at unit or the relay at unit to create a common?
Good job Jay! Sorry, catching up on the video time invested and not wasted backlog. Interesting to note that the Nest instructions allow for use without the power wire. Not surprised that it doesn't work well without it installed. They're probably just indicating it can work without the common wire to increase sales. However, to your point, could be a bad move on their part as you mentioned, they work without the common wire, but they cause or can cause all sorts of frustrating behaviors.
Haha thanks for watching my video man! Good to have you on my channel. The Nest can indeed work without a common wire and there are plenty out there that do... But at the same time, I have went to many houses where a Nest thermostat was behaving erratically and the problem was solved once a common wire was hooked up. Nest gained a lot of frustrated homeowners and techs and this problem is one of the reasons many HVAC guys will advise against getting a Nest thermostat.
Can the blue wire at the control board share the screw with the Red wire going to AC on control board .
So I just replaced my first gen nest with a third gen our central air broke years ago so I left that wire unplugged at the thermostat. I assume if I plug it into C at the thermostat and control board it might fix my issues.
Great videos keep up the good work. Watched a tone of videos even before you bought Nest. My nest is showing my furnace is shutting off while heating. Changed the air filter although it was put a month ago they are MERV 10. Furnace is basic no electronic over 30 years old. Since social distancing don't really want tech in unless necessary. Ideas maybe clean burners or what else could be the reason ?
Thank you! Does your furnace control board blink any error codes when this is happening?
@@WordofAdviceTV the furnace is so old that there's no control board. So can't read any codes.
Your advice was amazing. My thermostat had 2 wires W & R but I found an unused G wire attached to the furnace but not the thermostat. Watching both options 2 & 3 allowed me to make my best operational
Hi Parker, this is my setup as well. What did you end up doing to make this work?
@@hopz12 I unhooked the g wire because it clearly wasn’t being used without an actual connection. So I moved the g wire to my c slot on my furnace and the new thermostat
@@hopz12 let me know if that helps at all
3:07 this was what happened to me! I was so worried I would have to run a whole new wire up but saw a spare wire down there and in the wall behind my thermostat.
Thank you for all the good work you do, sharing your knowledge. I have the same question as Tony Felder i.e. how would the blower fan turn on, when need heating.
Just to clarify, my question above is applicable when you use the original G wire for Common (on both sides) and jump Y and G on the control Board
Usually the furnace mainboard will control the blower by itself for heating, even for cooling actually, but older furnace models might just be able to control blower for heating but not for cooling, and that is why Jay just suggested that Y to G jumper, and yes for many modern models you dont need that jumper.
If you have a pretty old furnace or electric heater, it cannt control the blower no matter for cooling or heating mode, then you have to let the thermostat to control the blower, this means you cant do the G to C switch, you have to keep the G wire in G position, and use a battery powered thermostat instead.
Thank you buddy