I got woken up at 4:00 am today with "the thermostat stopped working" and a 62 degree house. This video was the difference between being able to fix it myself or calling an electrician and waiting for who knows how long. Thanks!

Thank you sir. You are the only person to explane those damn wires. Now I can hook up my garage heater up. No one else explained it the simple way you did.

Thanks for the explanation. All the videos I've watched have not made sense, but once I understand the reasons why, I can rewire my thermostat on my own now. Thanks!

Extremely Helpful. thanks for sharing.

The best explanation that I ever heard

very very clear and explanatory great job

You gwt like 10 thimbs up from me man!! Thank you I have a crappy new m30 lennox thermostat with 15 terminals. My last one had 4. I'm just going to hook 4 up now I know thanks great video!!

Thanks man. That was well explained.

GOD BLESS YOU. THANKS

Great video Sir…thanks!

Well done sir!!! Much appreciated ! Your explanation was clear.

Thanks so much for this!

thank you, very informative

Your video definitely helped me understand what each wire was for. Luckily, our thermostat had five wires and our nest learning thermostat was a simple enough install.

Well done, thanks!

Omg thank you!

Simple and to the point. Have a quick query, planning to replace the old thermostat(no C wire) with Nest 2020 model. Stuck up seeing a Red wire also connected to the Y terminal in the current thermostat. Highly appreciate your advice.

hi i have 3 wire red black and white is it ganna work with power heat and cooling?

Thank you for making it easy. TTT

Awesome

Appreciate the video. So if I want to test if the C wire is connected at the control board I just have to get a voltmeter out and measure across the red and blue wire and it should read 24V?

Thank you for your video. My cooling system keeps running and cannot be turn off. Question: If my Y (Yellow) wire's Ohm value is over 24 Ohm, would it be the problem to run cooling?

Thanks

I hooked it up the way you show here but I don't have an air conditioner and the digital screen on my thermostat isn't turning on. Could the yellow wire cause that? There is also a brown wire that is in the wall but was not used on the previous thermostat. I'm not sure what that wire is for.

Great video thanks very informative , though my thermostat only has white G, red Y, white W and red R only 4 cables can I still set up any , any wifi thermostat?

Hi there, I have a 3 wire system; red (with the thing metal connector thingy), green, and black. It is a ct100 thermostat. It started marking noise one night and the only way to stop it was to remove it from the wires. I reconnected it (i think the correct way) and the heat works, but now the furnace takes a long time to kick on. I can hear it turn on (like an electric sound) but it takes like 40 seconds after clicking to actually turn on. I put the wires like so: black into W, red into RH, Green into G. Is that correct? I also tried testing the wires with a multimeter and the black and green show power, but the red doesn't. Can I check in the basement/furnace room somewhere to see if that's the issues?

I hooked a Honeywell thermostat which doesn't require batteries the way you have it but I also have and OG wire. What is that for? Thanks

Hi. What if I have a blue (B) wire and a gray wire that’s not attached to anything. I’m trying to install an Amazon thermostat and can’t figure out if the Gray wire is an unused C wire, since there’s no C terminal on the old thermostat. Any thoughts or advice?

Hi...I have a heat pump a/c unit. Trying to wire a new Honeywell wifi thermostat. I'm down to the last wire and I see a jumper for the R / RC screws. I only have an R wire leftover. Do I leave the jumper? Do I plug the R wire in WITH the jumper? Not sure what to do!

I have an old Honeywell thermostat with just a lever to control. I only have a red and white wire and I purchased a colorsmart Honeywell thermostat that needs a common wire. Is there an easy fix? The thermostat did have a short wire in the box.

Than you I have fujitsu concealed air conditioner with 3 wires red white and black, is this gonna work with any wifi thermostat?

If you don’t have yellow, can you use blue for the yellow wire input for nest thermostat

Hi, have a question. I have an old Carrier programmable thermostat that seems to be using only 2 of 6 wires sticking out of my wall. It uses a red colored wire connected to O/W2 and a green colored wire connected to Y1/W2. It works, but I want to replace it with a smart thermostat. The other 4 unidentified wires sticking out of the wall are 1 x Blue, 1 x White and 2 x Black. How can I identify which colored wire is what? FYI, all the wires are coming from a Carrier Packaged Unit 48DP012. Thanks in advance.

Thankyou I have 6 wires on my thermostat… what is that for..??? Thankyou

Hello, I have 9 wires with two wires on U1, U1 respectively. There is no U1 on nest wire code. Any help will be appreciated

This helped but I have a question, what if you thermostat has a wire that is marked RC should that be connected as well? Can you answer this

Can this be used on a modulater valve?

I have a 4 wire system yellow, red, green and black. What is the black wire used for?

I hooked up a ecobee because I installed a new split central air unit and coil and I noticed that the common wire is not hooked to anything on the furnace box side.

Could you make a 7 wire system works with 5 wire thermostat?

I try to install the ecobee thermostat to replace the honeywell old thermostat. I check the 2 wires go to my furnace. I see 2 wires, one connect to R and the other one connect to G instead on the W. There is nothing connect to the W on my furnace. My question is does it make any different? My heating been work like that. Not sure why my is not connect to W instead on on the G. Please advise how i can connect the wire G wire form the furnace to the ecobee thermostat. Should i connect to the G or the W going from my furnace? Thanks in advantage.

I have baseboard heat furnace. I have 2 wire connected to R and W in my old thermostat. There is no C wire. However there are 2 extra wire inside the wall and these are not connected to anything. After watching this video my question is, can I use a jumper from R wire to C wire on Nest thermostat?

Hey, great vid btw I have a question, what do RC and RH connections mean on my smart thermostat anybody?

Your vary much on it with detales

I was told we look similar.. and it seems we're both from Chicagoland

I have a 6 wire system… still waiting for you to get to that part “at the end”

Help... I have an ancient Trane thermostat & Furnace. It is 4 wire-R,Y,G,W. When I try and connect the new Honeywell TPro 6 that I have, it has a blue wire, I had it working but now it stopped working. I have connected the blue wire to the C (common) on the blower and it has a white wire already connected there. It was working great but when I changed the filter, and turned the power off, it stopped working. It says AC Turned on but nothing works. Equipment says it is in a "perpetual standby" mode. So I connected the old Trane 4-wire thermostat back up and it works fine. I tried to disconnecting the blue wire on the TPro6, but the thermostat went dark without the blue wire so it obviously needs it.

I have an LG with 3 wires. Yellow red black. Having problems hooking up a nest

I don't have a yellow and I cant get the ac to work on my nest, but heat works when I put the green in the ob slot

can I leave the green wire unconnected, and just connect W1 and Rh?

I have the following Gray(S2), Pink( S1), Blue(C), White (W/W1), Yellow(Y\Y2), Green(G), Red(Red), nothing(Y1/W2**), Orange (O, W2) Seems like my furnace and heat pump are coming on at the same time.

I was about to ask a question but noticed you have 1 to 10 months to a year or so comments with no answer to there inquiry. But I’ll go for it anyway, how about in need of heat in desperate needs, could you connect the red to white wire for heat (breaker off before joining) for a temp fix?

Running the fan also helps if you have a wood burning stove to help distribute the heat.

I took off old thermostat and there was no C wire connected. However there is a blue wire and a brown wire that are not connected. This is a new building (2017) so is the blue wire the C wire and they just decided not to connect it to the thermostat?

can you help me I only have a 2 wire thermostat. It has a blue and white wire where does each go? I stupidly forgot to mark them

Is the blue wire a way for electricity to return to the source?

I have an electric mobile home furnace and I have red, green, white, and black wires. What do I have for these wires? I can’t figure it out. I don’t have an Air Conditioner, just electric furnace.

hmm I only have a: R, G, B, W white...I also had a short black connector wire...I can’t get my AC unit to turn on but all else seems to work :(

My existing system is Gas Furnace and single AC unit. My existing thermostat has C,G,W,Y and R (no jumper). The new Thermostat has the choice of RC or RH with a jumper. (no R). Question: Which terminal do I place the existing "R" wire to? RC or RH? Do I leave the jumper in or remove?

Sounds like the N1 N L L1 thermostat I bought is not compatible to a four wire. RH W Y G

I have a four wire system R..G..W B purchased honeywell series ct30 it's wiring requirements are R G W Y my problem blue wire yellow wire

what if you only have two wires coming from the wall a RED and WHITE...? RED is power and WHITE goes where...? thanks

I have an old analog thermostat. But the Blue wire is connected to the Y letter. In normal, the Blue wire is connected to the C letter. Now i want to replace with a new thermostat. Where does the Blue should i connect to? Y or C? Thank you.

I have all those wires plus a ORANGE one? Whats that one for

What is the black wire for

Can anyone pls help me, I'm trying to install an ecobee smart tstat. However the old thermostat didn't use the green wire and the blue wire was in the "G" slot. The thermostat did run on batteries so I understand why the blue wire wasn't needed...but my question is why is the blue wire going into the G slot? Any help gladly appreciated

I have a blue one and a brown. Assuming the blue goes into C, where does the brown go?

what about purple? mine came unplugged and i am afraid to fire up furnace.

I'm so confused because I only have a white and Red wire I don't know why I don't have the other colors.

Hi. We have a Honeywell but no green wire..only red blue yellow and white. No green, which it calls for. What to do

Near the beginning, you say that you'll discuss 7-wire hookups at the end of the video ... but you forgot :-)

and what if you don't have a Y-wire and someone has put the C-wire as a replacement?

What if I got to yellow wires

Hi, where does a black wire go? I have Yellow, Red, Green, Black. Thank you

R simply means 24v your furnace or thermostat does not know what color the wire is. I love to wire my thermostats like this to confuse the techs that think the color matters. R-white W-green Y-red C-yellow G-green Also you need to hook up g to bring on fan in ac mode what you don’t need is Y to the board you could take that from stat to condenser

Sounds like I will be removing G. My fan is always running without heating or cooling.

Umm Did you forget to go into the 7 or 8 wire systems as you said you would at the end of the video?? Only reason I stayed till the end...... 😠

What if I have a black wire

Hi I could really use the help with my wiring, I'm getting a nest 3rd gen thermostat and I wanted to know where the e and r wire go because I get lost there C R O G E- this is a white wire. Y That's how they look on my thermostat now. I live in central Florida, incase that helps a little bit more to understand.

The fan is the only color that makes sense. Green for wind. Heating should be red, AC should be blue, Power should be yellow for electric. Would be 10x easier to remember something like that.

My question what is the L and terminals in a Thermostat I have L = ? I need you to decode the L function I hade a 5 wire and a 3 wire 3 wire had blue = c com/ white = E for emergency heat to melt ice buildup on compressor Red was o = reversing valve On the 5 wire White = w1 my heat Green = G my fan Red = R my 24 volts Yellow = Y. Ac Blue. = L. ? I change the mercury TState to a pro 4 could not get heat working Put back on the mercury thermostat work fine. Through all it’s function The mercury thermostat need the 8 wires to work there 4 mercury bulbs in the 1 thermostat it a heat pump system control from Carrier

What about an orange wire? I have 6 total wires

3 wire here! Help!

I don't have a yellow wire I have white blue green and red

She said that he will talk about systems that have seven or eight wires at the end of the video but he didn't where is it?

1:54 You got a mistake. Eh, so-so video, a bit verbose, you alluded to 7-wire systems but didn't mention those extra wires.

Really like your videos! But … it looks like you’re looking at the camera, which is good, but you’re not. This doesn’t interfere with your good content, but its a little distracting. Thanks ☺️

I give up. Paying someone. Let's face it, that's what we're all trying to avoid.

I'm trying to connect my wires this video did me nothing

Get the he'll off my phone

Bro, jus show me how to wire da shit

Could you help with a 7 wire system that has a w2,e,o,c,r,y,g

That was great info, for someone who has that wire set up, but I have only 4 wires connected to a thermostat they are as follows Red Green Blue, and Yellow the old thermostat has the following {RC} Nothing on it {RH} Red wire {O/B} Nothing on it {Y} Has a Blue wire {G} has a Green wire {W/E} has a Yellow wire and there's a {C} Nothing on it, And the new thermostat has a lot more connection options as follows in order on the left side {S} {S} {Y}{Y2}{G}{C}{U}{U} then you have the ARight side as follows {L/A(A)} (O/B) (AUX){W2} (E) {W} }{K} {R} Rc} what a mess. I was about to change the thermostat to a programmable but I'm lost on what does what here and help would be great the new Thermostat is the Honeywell Pro Series T6 Pro TH6210U2001, The Old thermostat is the Comfort Sentry from One Hour Heating and cooling. wish I could upload a couple photos... Any help on this would be greatly appreciated...