How to Tell if Your Thermostat Has a C Wire

[@MH-zr3re]

Rob THANK YOU!!!!! At 930p in Illinois and my house was 90 degrees. I installed a Honeywell digital thermostat in the winter. As I tried to turn the AC today it was not turning on. Viewed other videos and no help. Looked for the c wire per your video and boom ... it worked!!! Thank you again! Saved me money from making a call to HVAC.

[@RobSomeKnowledge]

How To Connect your Unused C Wire: kzbin.info/www/bejne/pZTZd2WVj8t3Y68

[@SB43T]

I did not know what C wire is, so this video is really helpful. Thank you very much.

[@crotopoc]

Excellent video and your C wire install video is as well.

[@TryMyMartini]

I don't see info cards. You said the links would be in the description and the comments, but I don't see them either place.

[@go4damo]

X2

[@actuallyadog_]

kzbin.info/www/bejne/pZTZd2WVj8t3Y68

[@mrr5654]

Thank you for being very informative about the c wire.

[@RobSomeKnowledge]

No problemo!

[@linaleahgarcia1516]

In the video you said you'd place a link for anyone that didn't have a C-wire?

[@roslinmiller795]

What if you use a jumper to steal the g wire? Will that work?

[@jim62367]

If you have no C wire, can you not split the G wire by splicing 2 wires off of it so that you can also still use your fan? I mean these are low voltage wires so it should not be a safety issue. The only thing I could think of is loss of power by the division of the wire.

[@StaticCreature22]

All these videos about the c wire are missing "how you tell its a C-wire" so as not to confuse it with this "g-wire" that "might still work" is it just written on the wire? Or am I supposed to look at it and magically know "that's the c-wire I sense it" lol

[@black10kevin]

my advice is to always look at the thermostats labeling and that will tell you what wire is what and then by process of elimination the wire left must be the c wire

[@michaelbryson5793]

On my non wifi Honeywell I have a black and white wire going to the white terminal. Can I assume the black could be the c wire

[@lookupverazhou8599]

Lol, wifi. So, you never really have full control.

[@Soljarag5]

If I take the batteries out of my thermostat, and it still has the display on... Does that mean the C wire is hooked up?

[@carolburnett8372]

Good question Soljarag5 ......wonder why they will not answer it?

[@Soljarag5]

@@carolburnett8372 turns out I did have a C wire... But YMMV

[@kaitlanclaycamp-johnson2197]

This ia GREAT! Thank you!

[@kipster-ll6po]

The problem with this video is that I wanted to know how to test the unused C wire using my multimeter in order to confirm that it does not already have power.

[@bangurowned]

Put your multimeter on V~ and see if it pulls voltage…

[@MoransPlan]

What's the link for connecting c wire in the furnace ?

[@RobSomeKnowledge]

kzbin.info/www/bejne/pZTZd2WVj8t3Y68

[@vtecyourselfbeforeyouwreck8109]

@2:48 Is it just me or is there no link in the info card, description or comments? Lol

[@RobSomeKnowledge]

There was an info card but I completely forgot to add to description and comments, hahah. I have added it now thanks for the callout. Heres the link if you are still needing assistance: kzbin.info/www/bejne/pZTZd2WVj8t3Y68

[@to174jay9]

replacing exact same thermostat w a new wifi thermostat. Like you, had the blue c wire tucked into the wall and wasn't connected to a terminal at the furnace either. checked the furnace and it already had a white wire connected to the c terminal. tried to twist together the unconnected blue wire with the white wire that was already connected to the c terminal (at the furnace) but still couldn't get the wifi thermostat to power up. Any ideas?

[@RobSomeKnowledge]

Do you have junctions that come off the control board similar to this video?

[@to174jay9]

@@RobSomeKnowledge not that i can see. the wires from the terminals feed into a a brown wrap and bundled together.

[@ditzfough]

@@to174jay9 when in doubt. Hire a proffesional. Safety first.

[@lookupverazhou8599]

@@ditzfough Me too stupid to do things myself.

[@Vanellaflowers]

“My green wire is connected to G a blue wire to Y a cream wire connected to W and a red wire to R with a jumper to RC.My spare wire is yellow is this d C wire? I am starting to get the feeling that the blue wire connected to the Y is the actual C wire and that the thermostat was just connected wrong. Would this be correct? Everything has always seemed to work fine. I live in old apartments but use alexa and I really want to get a amazon thermostat.

[@zroe337]

I pulled the harness out and found the c wire tucked away, followed your instructions to the furnace, and one of the two wiring harnesses coming into the wall has a blue c wire hooked up to the junction and the other is coiled up around the harness,. What should I do?

[@stroshow5]

Burn the house down

[@lookupverazhou8599]

@@stroshow5 Lol.

[@Vanellaflowers]

I have an extra wire in my thermostat but it is not blue it’s like a mustard yellow color and I am not sure if I can use that as a C wire since it’s not blue, can someone please help

[@RobSomeKnowledge]

Follow the same wire on the inside of the furnace or air handler, and see where that wire connects to on the board

[@nickl8192]

How about that D?

[@BillVol]

Can a C wire be attached to this particular thermostat?

[@RobSomeKnowledge]

No

[@BillVol]

@@RobSomeKnowledge Thanks. Couldn't find an answer on that anywhere. I wonder why they would make thermostats without c terminals?

[@2mikey8able]

I thought the G wire was to turn on your AC Blower only ?

[@650sFinnest]

So I have a blue wire connected to the Y but the yellow is tucked behind. I’m assuming the C wire would be the yellow wire and the blue is used as the Y wire 🤣. Why would they do that

[@RobSomeKnowledge]

Hahaha that is a great question that I don’t know a logical answer to! But also the reason I explain to not always assume the standard color coding was followed and to actually use the correct process to make sure the correct wires are being connected! Yet I still get people that argue that BLUE is ALWAYS the C wire. Lol!

[@99meimnot]

I have a blue wire but it’s connected and not wrapped around in the back. More explanation necessary.

[@RobSomeKnowledge]

How is it connected if it’s wrapped in the back?

[@DustInTheWindAZ]

What "info card"??? There is NO "info card"!

[@RobSomeKnowledge]

Sorry completely forgot to add the info card. Here is the link to the video I was talking about if you still need it: How to Connect an Unused C Wire (Common Wire) kzbin.info/www/bejne/pZTZd2WVj8t3Y68

[@Casper_Espresso]

It's great if you have a wire wrapped in the back. But you didn't clearly identify how we could isolate the C wire. Is there a voltage or amp going through the wire that we can identify it with?. Otherwise the video is kind of useless.

[@civilization57]

So look to see if you have a blue wire coiled behind the unit? Really? That's your answer?

[@RobSomeKnowledge]

Yes...? You either have a c wire or you don’t. Thermostat wiring comes as a bundle. So most installers just tuck it back into the wall if it’s unused. It’s not like there’s some random place in your house you’re going to find it. 😂 What’s so confusing?

[@heatherashbeck7961]

So... what if behind my thermostat there is more than just one wire that isn't being used?? Now what??

[@pick-the-kicks]

@@RobSomeKnowledge what if you don’t have a C wire at all?

[@RobSomeKnowledge]

Then you’ll either have to run a new thermostat wire or most smart thermostats have a C wire adapter you can use

[@lennyf1957]

you turned off two 220V circuits which have absolutely nothing to do with the thermostat. Makes no sense.

[@RobSomeKnowledge]

I’d rather turn off more than less lol so I just turned off anything that had to do with HVAC

[@Dwelly70]

Says “ go ahead “ 6 times in the first 10 seconds. Had to vacate video and hit dislike and go to next one

[@RobSomeKnowledge]

Lol, do I care? Nope. Thanks for the dislike, it still counts as engagement and helps boost the video. Also learn to count. I didn’t say it a single time in the first 10 seconds 🤣🤣🤣

[@FaxxHub]

LOL he didnt even say it once until 17 seconds in.... Tell me your missing a few chromosomes without telling me