Fix Nest Thermostat C-Wire Issues Without Adding a C-Wire

[@TechWithBrett]

I'm really glad Google came out with this great solution for the C Wire. Much easier then rewiring a brand new wire.

[@finnbenny]

I recommend venstar's add a wire! It works on all wifi smart thermostats that need a C wire. I've used it on nest and honeywell.

[@frodofrenchie1203]

Thank you for this step-by-step guide. I have two thermostats and having the same power issue on both. Will one nest power connector be enough for both thermostats and should I be installing the nest power connector on the same area on the HVAC circuit board? Thanks (again) in advance.

[@TechWithBrett]

In the official install video it mentions that if you have multiple thermostats you should install it at the Zone Controller. See 2,45 here: kzbin.info/www/bejne/rp3bY4ija6lkkJo

[@frodofrenchie1203]

@@TechWithBrett Thanks. My HVAC is an older model York Diamond 80 and it sits on the attic. I'm not sure where the zone controller is located. Googled it but I couldn't find any sites that describes/locates where the zone controller is. May have to contact local HVAC techs.

[@rockyman2752]

You made this process SO EASY! Ill admit it was pretty huge for me going inside my furnace to do the wiring but it was SO SIMPLE!!! Anyone can do this: Don't psych yourself out people. Just do it. The Nest thermostat is working perfectly and looks Great!

[@TechWithBrett]

It certainly was Intimidating at first and i'm glad I was able to relay what I learned.

[@yceman6273]

Fun little tidbit of info I learned about when setting mine up. Some systems have a "kill switch" behind the access panel. So if you're trying to test the thermostat and you're getting a no power error try closing up the access panel first.

[@eedubss1501]

This happened to me. Had no idea about the kill switch and almost had a HVAC tech come out to tell me just that… thankfully I caught it and saved myself the fee. New home owner lesson learned.

[@shannonpiedrahita3317]

THIS comment saved me! I had already scheduled a tech to come out tomorrow morning and then I watched the whole video above (LOVE IT! So informative) and the whole time I was thinking, yep I did that and that and that. What I didn't do was put the access panel back on, and I never would have thought of that! THANK YOU!!!!! If Brett sees this, I HIGHLY recommend pinning this to the top!

[@hometv1013]

The readings you don't understand at 4:35 are the actual voltages being detected. Vin is the A/C voltage coming into the Power Connector from the transformer on the furnace. The lin I am assuming is for Line voltage in, which looks like DC voltage, minus a decimal point. 3.85 volts DC would be about right to charge the battery and keep the WiFi connected. Nest says the WiFi will drop out if the voltage goes below 3.8 volts. The other two numbers at the bottom??? I don't know. Y looks like a repeat of lin. YP might be how many squirrels are living in your attic...

[@redsaint2022]

FREE POWER CONNECTOR!! I didn’t know I needed one since I don’t have a C wire but thankfully while setting up my Nest Thermostat on the phone it gives you a link to them to have one shipped out completely free!

[@BrutalEchelon]

Can you post that link

[@fartmanny]

Did this at my house! If you get Confused on what wires you have my first recommend to go to your Nest remove the nest and take a picture of what wires are connected to the thermostat because they’re the same wires that are down in your basement take a picture of that go down to your basement furnace and compare the wires colors and all of the diagram in the instructions and you can do it very easy took like 20 minutes definitely better than putting a new wire for your thermostat! You can do it!

[@paulaursino]

I may have spoken too soon. IF all the wires are connected correctly and has been working fine (nest showing wattage going up slowly while on/off), what could be the reason why nest battery is now saying again "battery low"???? I may need to hardwire a C wire afterall. Suggestions on what to do? Can I do myself?

[@airmech5083]

Those nest connectors fail in a year or two and most likely causing high ticket repairs to your HVAC systems. Cheap fixes cost more long-term.

[@hunterdotpitcher]

how do you do a dual zone?

[@jgulley12]

Would it be easier to move the green wire to the C terminal on the furnace? My Y wire is also blue. I guess the installer ran out of green wire.

[@hartzinmt]

You are correct in stating that it may be cheaper than installing a new cable. However if you have access to the thermostat cable pathway I would go that route. In my 2002 built home I had a six wire cable but only four conductors were available upstairs. Had to use some of my cabling skills to understand that the electrician that installed the cable years ago decided to use the remaining two conductors as cable hangers within the wall. Thankfully I was able to use my cabling skills in carefully freeing up the remaining two hidden conductors. Don't get me going into how much I can't stand electricians installing communication cables with staples and such. Lol!

[@TechWithBrett]

Great point, I am glad adding a new wire in my home was pretty easy. Glad you got yours figured out! I still have a few wiring mysteries to solve.

[@Dana-cb7vk]

Shout out also to those who run the extra C wire in newer built homes, but never utilized. That is a forever grateful moment here. So if you are out there and built our home in 2007 (most likely not, but hey!), and happen to stumble upon this, thank you.

[@Dr-YouTube]

@@Dana-cb7vk You’re welcome

[@MattRial]

The description was perfect. Just one thing remained. So after connecting all those wires and double-checking them, you should go back to your Google Home/ Nest App and update your wiring to remove that error N260 notification. Go to Google Home>Thermostat>Thermostat Setting>Thermostat (under Device features)>Wiring>Update wiring

[@prestoncarruthers6357]

Yes! Thank you. Was annoyed when everything was working correctly but the error wouldn't go away. This is the fix.

[@steventar32]

I have the same problem. I heated up my house with my current wiring. Which wire was connected together and needs to be separated? I need help

[@stevejohnson248]

Such a great video and enormously helpful. Alas, what happens when you have more than one wire into the furnace terminals? The video shows/tells to pull out a wire from the terminal and replace with one from the power connector. I have two reds into the C terminal, two whites into the W1 and a blue and a white into the Y. Yikes! Don't know which to pull and which to leave. Thoughts?

[@DylanM15]

It’s kind of interesting I had a Nest installed working without the C wire for I believe about 2 full years on a heat only system. The past few days it started giving me power notices even when off. Suddenly Google offered us a free power connector then from the Google Store, so I just took that offer. I was semi surprised there was no caveats either like, “free if you do this” or “with a mail in rebate” or “free but also pay for shipping”.

[@kmueller86]

Same for me!! Did your system detect the power adapter they sent though? Mine didn’t and I’m going on two weeks without air or heat. It look like my blue wire went to the CU, but the pictures I took of my thermostat and furnace were deleted with several other valuable pictures, and I’m lost at what to do. Also live in a building 😢 any advice?

[@repairdrive]

How did you get Google to send you a free one??

[@carloshernandez3260]

@repairdrive not sure if you got your power connector yet but on the initial thermostat set up it asks if you have one. Just select know and it will tell you you need one and gives you a link to order it for free. Took me 3 days to get mine

[@repairdrive]

@@carloshernandez3260 Did some more investigation. Turns out the builders installed an extra unused C wire! I just connected it up top to my Nest and at the furnace to the correct spot and it works flawlessly now 👍🏾

[@haileylundquist3577]

@@repairdrive my access panel shows a C wire but I don’t see it by the thermostat hook up, how do I get it up there?

[@mpower1226]

Another way is just use the g wire which is the fan connect to c at both ends(thermostat and at furnace control board). Then jumper the y and g at the control board.

[@kevint9553]

Tired this on mine and didn't have any luck. The thermostat kicked on and no air was pumping out the ducts and my AC unit started to build up all kinds of frost.. any idea? I swapped G wire to C at both ends.

[@akhtarkh]

You are disabling independent control of your blower motor. Tying your blower fan with AC compressor, but how would it work in winter when furnace is used?

[@allanbrito13]

​@@akhtarkh technician here, the furnace circuit board/fan control would turn on the fan when the furnace comes on. The G terminal is there to run the fan independently without the ac or heater running.

[@timbeaudoin3892]

So, just to confirm, adding this power connector will allow independent usage of the fan, correct?@@allanbrito13

[@alvinalbertmunson5468]

Piece of cake! Did my self Thanks to this video. Thanks for taking the time to make it

[@ranger1244]

I have an older 2 wire heat only boiler to baseboard radiators with 4 zones. Would this be compatible in my system? It does have a control board but not like yours.

[@richardlee4438]

I have a oil boiler and separate AC air handler. Will this work on just the AC unit?

[@haileylundquist3577]

My Y screw has two wires going to it, which one do I put into the connector?

[@joro8604]

If you only have two wires at the thermostat (for a furnace only), will this work?

[@MrRicow89]

How do u connect your Nest power connector to your furnace if u don't have a terminal block on your control board?

[@thumpervu]

If i don’t have a C wire is that why I am having issues where sometimes it blows hot air ?

[@SarahMcFee-ki6ew]

Looks like mine is heating up too- how do you know you mixed up the heating and cooling wire?

[@TechWithBrett]

Did you have a before picture of where the wiring was at? I'd double check the wiring there with what you did.

[@buellbiker1]

Hey Brett great video. I have the same furnace board as your parents but my Y connector on the board has 2 cables on it before doing anything, a red & yellow one. I am in the process of installing the Nest Power Connector but I am not sure which cable to pull and connect to the Nest Power Connector. any advice on this would be helpful, thanks

[@AgentOffice]

The one that's with the others. The extra one is for the compressor

[@Synchrimedia]

the Nest Power Connector is free. there is a link for it in the setup app if it detects you need one. that said, I could not successfully get mine working. my furnace has a Honeywell Oil Primary Control that the red and white wires go to. I do not see where there is a Common terminal to hook the Power Connector to. It has a T, a T3, and terminals 2, 3, and 4 but none are labeled otherwise.

[@lemonherb1]

I wonder if the Nest Power Connector would work with the 1st Gen Nest Learning Thermostat?

[@strhhswgter]

Can the Nest Power Connector be installed at the thermostat?

[@vitman4414]

So what the C terminal does is constantly charges the internal battery otherwise without it the only time the internal battery charges is when the house fan comes on. So you want the C connection for times when your house fan doesn't run for a couple or so days.

[@aaromckee4784]

can you use this if you have a steam boiler with no control board just a transformer

[@meisie41]

Great explanation. I want to add two nests to my house. I have 5 zones and two are going to be nest thermostats. Do I need one of those c wire replacement items for each thermostat?

[@abdullah_q8171]

Hi i have just 3 wires can i use G wire for C to install wifi thermostat ?

[@paulaursino]

THANK YOU! Glad you said to double check. I did. BUT, somehow i missed that i put the C connector into the G slot. so i had to go back and do that. DUH! 💥ONE THING TO MENTION THO.....I tried to check the nest to make sure everything was good BEFORE i put the cover back on. That said, without the cover the lever that makes the orange light come on (which shows everything is good to go on the HVAC) nest would not detect it. So, i DID have to put the inner cover back on first to check it. And *poof* all wires detected and connected per nest. I checked the power and it was slowly going up when not in use. so YAAAAYYY!!! THANK YOU for your great video. I watched the video supplied from google and it seemed much more complicated. Yours made it super duper simple! THANK YOU! 😃

[@garrettmarcus]

Do there is no C wire at my thermostat but there is a wire already plugged into my C terminal on my HVac. Do I leave it there?

[@sheldonman14]

As he said in the video, leave all other connections :)

[@gerardo.galvan]

@@sheldonman14 you sure it’s okay to have two c cables connected to terminal?

[@sheldonman14]

@@gerardo.galvan I have had mine configured this way for a few months. No issues

[@gerardo.galvan]

@@sheldonman14 did you also have a red and blue cable connected to y terminal?

[@accordxtc319]

Great video, I also got one last week for my Gen 3. I have to say it's lacking huge for those customers like me having no way to know if this thing is working.

[@TechWithBrett]

Did you have an error in the app before? It is odd there is no way to detect it is working for you.

[@accordxtc319]

@@TechWithBrett Yes 3 days after installing the new Gen 3 to replace the defective Gen 3 I had I got a E195 error. Ordered up the Power Connector and contacted Nest, even they said you can't see like the new 2020 Thermostat a Power Connector section. No biggie I guess but typical Google for you.

[@antonioterrell354]

@@accordxtc319 ; I'm still undecided if I need one of these or not ... Installed a Nest gen. 3 for my old two wire controlled gas furnace. And the thermostat appears to be fully functional and no error messages on setup without the need of a "C" wire just as Nest advertises it (as with the Nest E). However, on another YT channel at least one HVAC tech claims that while the Nest gen. 3 and Nest E may start out that way appearing to function without a C wire as advertised. He's encountered many instances where this starts causing problems later on. So I don't know, as it's been installed over a month now and still showing no indication of problems.

[@accordxtc319]

@@antonioterrell354 For the low cost of the device, you definitely won't go wrong adding it, not adding it well that could be a gamble your not willing to take. I've been happy with adding it. Extra piece of mind I see it as.

[@antonioterrell354]

@@accordxtc319 ; Ok thanks ... Took your advice and ordered one of these from Amazon and installed it yesterday. I can only "assume" it's working since the Nest 3rd gen. t-stat gives no indication in the settings that the NPC is detected like the 2020 model in the video does. The furnace still works as before without any error messages. I guess the only indication I have is that during installation with power to the furnace turned off I noticed the battery voltage dropped slightly by a few hundredths of a volt. After turning the power back on the battery voltage eventually climbed back up again to where it was before. So I guess that's an indication the thermostat is receiving power through the NPC. But I sure wish Nest had given the 3rd gen. model an indicator in the settings confirming the presence of the NPC's installation.

[@lqdxoni1]

hooked up many nest units and had c wire deliver only 4volts that power connector saves the day specifically when acessories are in play

[@anthonychen6478]

What about I have two zones ? Do I need each one for each zone?

[@edgarflores9064]

Just a quick question why do you need the nest power if you already have the blue wire?

[@TechWithBrett]

Just because the wire is blue doesn't mean that it is connected to the C Wire. Verify on your system at the thermostat and furnace what wiring you have first.

[@edgarflores9064]

Yes they have all different methods of wiring looks complicated but , am electrician myself so complicated is my last name

[@woodyengle178]

@@edgarflores9064 maybe you can help me. I have an old behemoth of a furnace with 3 wire to Stat. Red white blue. Blue not being used, either end. With and old Honeywell turn dial Stat. I replaced wiring with 5 wire. Ran red and white accordingly. Still have blue green and yellow at Stat and furnace. I can use blue for "C" right? I just don't know where to wire it on furnace end because I don't have circuit board. I have a limit switch and th/tr switch. And a transformer, saying load on one terminal. White wire runs from stat to former red wire runs from Stat to limit to th/tr back to former. Please help. I feel like it's a really simple fix . I'm just not qualified. I'm a carpenter not an electrician! Thanks for any help. I'm currently without heat because of this. Thank the lord we had decent weather today.

[@edgarflores9064]

Sorry I sound to cocky is really hard for me to explain with words plus, I will confuse you even more really sorry

[@theoneandonlyswerve]

So when I go to add my C wire, there is already an existing C wire like in your video. However, my terminals are not screws, but simply plugs. How do you add multiple wires to a plug?

[@lam2558]

In your video, which part was the incorrect wiring?

[@wesleytabor1777]

how to hook up with zone valves

[@Wesley-Houlas]

If I have someone install this power connector, will my old thermostat still work till I decide to connect the google nest? I got my furnace ppl coming for regular maintenance so I figured I’d ask them to connect it for me. But i may not feel like mounting and installing the thermostat when I get home from work that night. Probly wait till the weekend if possible. Or will it no longer work with my old thermostat?

[@Dana-cb7vk]

Luckily we had a c wire ran but never hooked up, both at thermostat as well as furnace. So we avoided extra wire splicing at furnace level, sans hooking up that spare blue wire that was originally ran, but never utilized. Home built 2007. We got lucky. Sadly we had that extender kit and installed it first- before running into AC run issues. Luckily, we took a pre-pic at furnace level, so we "were able to revert", all that extra; in order to just splice in that spare wire. So follow that advice on picture- and be 10000% sure to double check wiring at both thermostat and furnace. Those two pro tips will/can save future headaches and a service call.

[@legoturtle92]

I have a 3 zone thermostat and I'm not quite sure where my c connection is to do the wiring. Any suggestions?

[@k00lboricua]

I don't have a circuit board on my furnace. Nor a C cable. What should I do?

[@TechWithBrett]

You will need to contact a Nest Pro / AC Tech to help.

[@mikke906]

Is the lux power bridge the same as this power connector? I have a lux geo currently installed with the power bridge and the thermostat runs with no batteries at all. I tried to install the Google thermostat but it would say it didn't have enough power. Did you still keep the battery in the Google thermostat after installing the power connector?

[@MalibuWaGOON]

What if I don't have a Y wire?? I have a WRGB

[@Aurora-Ave]

My wire box didn’t have a Y wire connected, I’m confused

[@aprildobson1652]

Our boiler is 24 volts. Would that be okay?

[@TechWithBrett]

Yes, it supports 24V AC.

[@aprildobson1652]

Thanks so much!@@TechWithBrett

[@djtripoli1058]

Hey Brett! My old thermostat says it’s a 30 VAC. Will that not work?

[@oxoJOHNSONoxo]

Yes it will work. It's 30vac max. Not considered high voltage.

[@josesosa1628]

I have a green white and red cable that means i should also find the same colors on the board and install them the same way red to r and white to wy? Thanks

[@TechWithBrett]

The colors might be different so you need to verify what color was plugged into what label first and then match the labels.

[@RennieRomero]

How do I install it on a dual zone?

[@danyeldan2139]

I installed nest 3rd Gen my Thermo cable is 4 wires I have C wire in them but I dont have G wire I think that's why I dont have Airwave option in my nest I contacted google they say I need to have G wire because is hard to rewire can I switch C wire to G wire and I install this Nest power connector as a C wire? what your thoughts ?thank you

[@KevinKhan]

Curious, this says c- wire issues. What are the issues that one would have that requires this power connector? Also you have a c wire connected to your control board. Is that going to the thermostat?

[@JWH-01]

Many older houses only have thermostat wires with 4 conductors. That is the case in my house. I replaced the furnace a few years ago. The new furnace has the C (common) wire connection on the control board. It wasn't used on the old thermostat. It is now needed on the new thermostat. I ran a new wire with 5 conductors.

[@gerardo.galvan]

What is the purpose of the c wire and red wire that was already connected to c and y terminal? It was separate cabe with just two wires the other cable with 4 wires goes to thermostat. I have red and white wires connected to control board that are separate from cable running to thermostat … I take the blue cable and connected it to nest power adapter and leave the other red cable connected to y terminal + cable from nest power adapter?

[@parth516]

one thing i will say is that my Y wire on my HVAC unit was not directly connected to the y terminal on the control board, instead it was connected to one of the compressors wires with a wire nut. In this case i used the wire nut as my "y terminal" and connected the power connectors y wire to the wire nut and it worked and got detected. I had to find this solution through the ecobee forums after hours of researching so i hope this helps someone who is facing the same issue i was.

[@gerardo.galvan]

Thanks for sharing this… seems like I have same situation. The y cable connected to terminal on board has an additional red cable connected to it and white cable connected to c terminal.

[@Dana-cb7vk]

Yeah some wire ins at furnace level, especially when Central Air is installed, can have all sorts of uniqie scenarios. Pro tip, there. Oirs has all sorts of odd wire ins at furnace level. Grateful for a pre ran, unised blue wire we used for the C wire at a proper splice in point.

[@countryside8122]

What is the c-wire for?

[@TechWithBrett]

It is able to help provide more constant power to keep the thermostat working without using the batteries.

[@gypsea1671]

Dude, if you already have a C wire on your furnace, you don't need an adapter, just run it to the tstat.

[@rhino11us]

What if I have a zoned thermostat.

[@SarahMcFee-ki6ew]

currently attempting this- right now it says "no power to rc wire " detected- any suggestions?

[@SarahMcFee-ki6ew]

Just kidding! I put the door back on and it was fine :) thank you for a great video!

[@TechWithBrett]

That's great to hear! Glad you were able to get it to work.

[@Paulsapartment]

Do not have ac only heat do I still need to do this? I have no c wire and only 3 wires. An R , G and W wire.

[@Paulsapartment]

Ok I just bought the nest connector and will try installing tomorrow!

[@larryhazenvt]

this is all okay as long as you have more than 2 wires off the boiler.... we have only 2 connections... I've done this twice now - for each of our daughters... - and it's not as mentioned in the tiny weeny manual....I had to connect my power supply (24 v) to the red thermostat wire and C on the Power Connector... NOWHERE did I find this information easily... luckily doing it the second time I knew the loophole....

[@peterding8181]

Thanks a lot for this helpful video! It helped get my thermostat up and running :)

[@stephenfromcalgary3834]

Q: @2:16 Is it that you have two wires attached to the system before you make any change? Because @3:09 I can see still 2 wires jamming on the spot "Y", (to my understanding you have removed the original blue wire and paired it with the power connector "Y" wire on the left then you connected the connector's "Y" wire on the right to the system. Thanks

[@stephenfromcalgary3834]

@@IkLms11 since you are here, one more question, if I don’t have Cooling system at home, can I use the Y wire for C wire connection? Without the need for buying the Power Connector? Thanks a lot!

[@tariqnewaz782]

Thanks again. Very helpful. When I called an Electrician to install the C-Wire, he was asking $295!!!! I watched the video and install myself.. You saved my wallet my friend. 👍

[@VIACOMSUX1000]

Hey ! I have 2 wires going into the R and I have no idea what to do..I have made a video showing my issue..was hoping you would be able to help me out

[@gerardo.galvan]

Same here … did you figure it out? I’m trying to figure out what I need to do with the additional cable. He said to leave it connected to terminal but wanna make sure that’s right …

[@Dana-cb7vk]

It just means you had 2 ran vs an R jumper. It may not be compatible. Depending on furnace level, you may be able to splice both r wires, but atypically the thermostat will have a slot in for both R and Rh.

[@dgcrago]

Wait so if the power adapter fixes that message and doesn't detect a c-wire .... Do you even actually need it? I don't have one and don't want to install an AC adapter and don't want to hire someone to run a c-wire if I don't have to.

[@johnfinley2638]

This was awesome! Thanks so much !!

[@edde333]

Awesome video! Always great and helpful content. I hope all is well with you and the family. 🙏🏻😁

[@DanburyConnecticut]

why do you have two wires going into each terminal? shouldn't you only have wires from the google adapter going into the terminals and the wires you take out of the terminals go into the crimps along with the other wires from the adapter? i came here for help with wiring mine up and am more confused than before.

[@DanburyConnecticut]

my unit was heating only, maybe that is why, all set now tho.

[@gerardo.galvan]

@@DanburyConnecticut I noticed… I have similar setup… did you keep the c and other cable going to y? Or do you only have nest power adapter connected to terminal ? Just one cable connected to c and y terminal?

[@ahmeddanial1342]

I don't know why my fuses keep blowing when i turn on the AC. I followed all the steps. It is happening when i use c wire adaptor. Any idea what is happening?

[@ahmeddanial1342]

Follow up : It turns out I already have one c wire connected in the hvac system and not on thermostat. I took the red wire out from c wire terminal in hvac and just inserted the c wire from c wire connector . Now my ac works perfect without blowing any fuse

[@TechWithBrett]

Glad you figured it out.

[@GPCPR1]

I don’t have anything connected to the Y. At the unit but there is one at the thermostat.

[@davidhazas7162]

Gotta find where that Y wire from thermostat connects inside the unit and go from there

[@QuestionsNotAnswers]

This is beyond frustrating People are searching for no C wire because THEIR BOILER DOES NOT HAVE A C WIRE not because they just can’t find the c wire for example my boiler has T T for the thermostat and L1 and L2 for the line voltage side that is all there is no C no W no Y no R no P no QZNW… so I do not have a C wire and this video lies saying you don’t need the C wire then shows you how to hook up to the EXISTING C-Wire!!!

[@PrashantAgrawal]

Thanks for the video! I was planning to get the Nest power connector. But then found out that there are spare wires in the cable that I can just use as C wire and connect to both thermostat and furnace. Do you see any issue with it?

[@WorthingNJ]

That is definitely what you should have done

[@LivingLife128]

i don't get how this thing works. The C wire is required to feed the 24 v back to the thermostat to power it usually . how does this device get power back to the thermostat?

[@Dana-cb7vk]

The splice in unit creates a C wire scenario, without the pain of running a completely fresh wire, is the solution. It is indeed a complicated one, but it plagues all smart thermostats when no C wire is pre ran. You can still run that wire, or may even have an unsued ran, wire. That could be utilized as C with splice in usually pre board where the power wire runs up to a splice/wire nut. So when this device is utilized it takes that 24v and runs it into the box and utilizes another wire (usually AC, sometimes fan but that power is not a constant/common, which is what the C wire is) at thermostat level, and then that wire instead of going to AC would go to C at thermostat level. The box reconfigs it to run both C and AC as it still has a splice into AC at/before board (furnace side). The box just acts as a fancy splice in to allow both C as well as AC to properly function. Just be sure not to blow that board fuse as it will surge to the AC unit and moat likely blow open the power unit, causing AC to constantly run. So be sure to follow its instructions to a T. I hope that helps. It is indeed a complicated fix, but it works.

[@user-pwfus]

Should have just bought a new harness with 5 wires and fished it threw to the thermostat matching the colors accordingly now you have a lot more room for error but this works also.

[@ChrisMillerLite]

I'm confused. You labeled the video how to fix issues if you don't have a c wire. But then at 1:45 you say that if you don't have a c wire installed you need to hire a pro

[@josephteneriello6346]

Yeah I’m trying to figure that out as well. I only have a red and white wire on my panel. No c wire connection. Not sure what to dp

[@greetthevictors]

I’m about to do this right now. Wish me luck. 😊

[@TechWithBrett]

You got this!

[@ZteveW]

I don’t understand. If you did not physically add a C wire, How does the Nest thermostat gets charged? Apparently the nest that I have is isn’t charging the battery and I have to pull it from the wall and manually recharge it.

[@TechWithBrett]

The Best Connector just pulls power from one of the other lines so it has enough. I heard it's possible to do without this device but I'm no electrician and wouldn't want to try it and break the system.

[@bilalsyed6]

How do I check if I have 24 HVAC system???

[@joeythefoxxo]

Volt meter. Or read the diagram in the panel.

[@david821103]

Idk why after I install nest connector still low battery . Who could help me so desperately.

[@twmissmt]

WHAT IS A C WIRE? I disconnected my old thermostat and there was a blue wire and a yellow wire NOT connected. The only connected wires were Red, White and Green. Are one of the yellow or blue wires a C wire?? What is a C wire for??

[@how2q]

Great graphics thx for putting this together!!😊

[@cl88888]

Thanks Brett! Was gonna do your first solution but this'll be way easier solution! :)

[@xMaugrex]

dang, mine still says no power.

[@meadeadams]

This says “no c wire” but what are you doing with the c-wire on the power connector? I have nowhere to put it…

[@TechWithBrett]

They should be a place on the furnace panel that is C, do you not have that?\

[@meadeadams]

@@TechWithBrett I don’t. Not that I can tell anyway…nothing is explicitly labeled C

[@meadeadams]

Oh wait, I was using the zone panel not the main furnace panel since I have multiple zones…should I use the furnace panel?

[@TechWithBrett]

It should go at the Zone Controller. Is this for heating and cooling or just one? storage.googleapis.com/support-kms-prod/WJrWiEaeDuoZnn7t6LNYcRa50GQKt4dECMKH

[@janeleekeller]

Thank You Brett 🙂 Having New windows installed Throughout the house - followed by Central Air . Need to learn about that, as I want whatever Air Conditioning we get, to also work for Heating. Any Videos about That ? (I know it requires a "Pump", and a Heater). My Ex Husband Suggested - Courrier or Mitsubishi. What Do You Think ? JaneLee 🕊️ -- in Suburban Philadelphia 7/17/21

[@Dana-cb7vk]

Between the two: Courrier. Why? Parts. No Idea what the future holds but for HVAC newer stuff is currently what is being made/available (so if you have old stuff double check everything to make sure its ok now folks!), and we have all these worldwide shipping issues. I would avoid Mitsu if at all possible for those two reasons alone: for when something goes wrong. It will, just a matter of when. For us, it was the fan. Luckily, it was before all this nonsense- but not being Mitsu, the part was 10x's easier to find, and if it were to occur now, most likely cheaper due to those availability issues. ;)

[@janeleekeller]

@@Dana-cb7vk Thank You for replying Dana 🙂. Your advice, and the "Why", Much Appreciated (◠‿・)-☆ JaneLee 🕊️ - in Suburban Philadelphia 12/8/21

[@amilvirani1582]

Thank you! This worked!

[@davepetty4627]

So.. google's fix to no C wire is to .. require a C wire? Honestly, where is the 'no c wire solution' here? You still need a 'C' wire terminal on your board.

[@Dana-cb7vk]

The splice in unit creates a C wire scenario, without the pain of running a completely fresh wire, is the solution. It is indeed a complicated one, but it plagues all smart thermostats when no C wire is pre ran. You can still run that wire, or may even have an unsued ran, wire. That could be utilized as C with splice in usually pre board where the power wire runs up to a splice/wire nut.

[@guitarhvac]

All HVAC units have a “C” wire inside the unit. A “C”(common) is just the return side of the 24V transformer that runs the control circuits. He’s just connecting to the C terminal inside the unit so you don’t have to run an actual wire to the thermostat.

[@manna06]

Yea… I don’t get it either. I still saw the C wire in his video and in Google’s video… I don’t understand. My furnace is old and doesn’t have a c wire

[@AndruComedy]

There's no c wire, genio'z. I believe it uses the R wire to run the constant flow.

[@chrischin9921]

This video was not clear at all. Really confused as to the c wire. Horrible video

[@mrman880]

Thanks a lot mate

[@alexreed7775]

Were you just in the basement? If so, ill snake a 3 wire 18g down to ya. Thanks 😊

[@lany_07gaming]

Nice info and great review as always.👍

[@TechWithBrett]

Thanks! 👍

[@henrysantos942]

No circuit board with c terminal on my boiler😒

[@tjdriftking2156]

Thank you

[@HailAnts]

I don't understand why this is the fix. I bought a Honeywell smart thermostat and I just hooked it up to a Radio Shack AC adapter and plugged it in. The only downside is you have a wire coming out of your thermostat, but who cares? No messing with your furnace _at all!_

[@tater1958]

Dam and all I did was connect the c wire to the ground wire of the closets outlet or switch

[@faengelm]

very well done.

[@bills6946]

A better solution is to drop a 2 wire 18 ga inside the wall and come out at the baseboard and buy a 24 volt 40 va plug in transformer. Plug it in to the nearest receptacle.

[@xm9g]

Great video!

[@kevinhawthorne5257]

Great video