Thermostat Wiring Diagrams! 10 Most Common!

I Show The Low Voltage Thermostat Wiring Diagrams for Heat Pumps, Electric Strip Heating, Furnaces, Air Conditioners, Boilers, and 750MV Gas Valves. This video contains 10 Wiring Diagrams. Always Follow Manufacturer Wiring Diagrams as they will Supersede this. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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[hardrider]

This video helped me tremendously in installing my new Nest learning thermostat. The wires from the thermostat I was replacing were not properly labeled and the original installation was performed without the common wire. I kept getting "No power to Y1". After following another video on YouTube, I performed the G wire hack but then I got the "No power to Rc" message. I was about to throw in the towel and call a professional when I found this video. Through watching it, I was able to figure out that the wire with only two leads came from the outside and the other wire went to the thermostat. I learned the meaning of C wire, Y1, Y2, Rc, Rh, G and they were no longer just letters to me. I figured out which wire coming from the outside was the common wire, hooked up a common wire to go to the thermostat, fixed the mislabeled wires and the Nest was happy. Thank you so much for putting this video together!

[Kunstentech]

We are in smart home services and your video is very educational, cannot thank you enough

[geceluv]

You are by far the best HVAC teacher. I just can't thank you enough sir. God bless you❤️❤️❤️❤️

[nicktode]

this video just saved me a minimum of $150 to fix the wiring mistake that another company made if not the full 750 the original company quoted stating I needed a whole new board... for a wiring mistake they made... Thanks!

[Rinebo]

The low voltage to me can be one of the most challenging things I come across. Thank you for this help!

[ngdxsvs]

I so look forward to watching your very helpful and educational technical videos Craig .
Thank you

[notanewbie]

Keep 'em coming. Great teaching and illustration skills.

[duraznofrizco]

Thanks Teacher from AC Service Tech LLC Good Luck 🤝👍

[jessechristiansen]

Thanks so much for the diagram! followed it as you showed for the furnace and A/C and my thermostat finally controls my A/C unit now. Thanks again

[dunbartuason]

Boy do I have allot to learn. Thank You
I have a heat pump Natural Gas Thermostat wiring I couldnt quite follow

[scottprimm]

Thanks for the great explanation and detail. Your attention to detail is greatly appreciated. I work as a technical engineer and again just appreciate your attention to detail. I know enough about residential HVAC to be dangerous but with your great explanations I was able to successfully update my thermostat. Thanks for everything!

[kenmassaplumbingheatingair]

Thank you as always Craig! Love this trade!!!

[rj.parker]

I like the extra effort you made to draw the diagrams in a manner viewers could read them on youtube. Sometimes manufacturers' drawings will use dots to indicate connections at crossing wires. I find that arrows on the lines helps people understand where the current is flowing to and from. The heat pump W circuits are interesting with two sources feeding the same ahu heat control. Two stage wiring is another challenge which is pretty common these days and dual fuel certainly adds complications.

[clydeusa]

Great vid. Easy to understand.
Thanks.

[vrmntthb]

As an electrician by trade and are working with an HVAC contractor currently, I had to break the control aspect down to what is the hot wire( red) and what is the return wire (common) to make 24 volts work though out the control of each function on a thermostat. In most cases red is hot to then have the thermostat construction and actions determine what it powers —the white ( heat) yellow (cool) green (fan) and brown or black for the reversing valve while the blue ( common ) is now required to be installed for the WiFi and Nest thermostats to work and charge internal batteries correctly. it may help others in understanding that a thermostat is a temperature based selector switch for the action one will look for in controlling the function of a heating and or cooling device as red as it’s hot leg to call on those such functions with the common returning to complete the circuitry.

[hddm]

Thanks man. You saved me a lot of money

[gilbertopatino]

Thank you very much for another excellent video 🇺🇸👍

[edilsonserafim]

Thank for sharing all this information I am learning a lot with you

[blisslife]

Nicely done indeed, but left out a two wire setup(as simple as it may be). Cheers