So 4/4 and 5/5 when dealing with the wire setup. But here is a list of the most common wire color to function mappings, as seen in many four and five wire t-stat setups. On the back plate, you will see a number of letters. Sign up for our smart home newsletter to receive the latest news on smart home devices, exclusive how to guides and our smart home advice. Let's take a look at the G wire. I currently have a Honeywell dial type thermostat installed which needs to be replaced, i have bought a Honeywell digital thermostat (DT90E). But there is no particular standard for thermostat wires, so it can be any color like Yellow, Brown, Green or any other color. Even though in our example Common Wire (C) is NOT be included, here is a great visual breakdown of thermostat wires (with schematics): If you just want air to be moving around your house without being heating or cooled down, G-wire (or green wire) is responsible for that. 250 ft. 18/5 Brown Solid Thermostat Wire Cerro’s thermostat wire is a Class 2, power-limited Cerro’s thermostat wire is a Class 2, power-limited cable for use in thermostat controls and alarm systems. Use the blue wire in your thermostat wiring for the C-wire - that's the common color for it. Typically a 3AMP fuse like this will work and you just pull out the old fuse from the control board and replace it with the new fuse. Again, no blue wire appears. Usually “C wire” or the Common Wire will be a blue coloured wire. You are using the information provided at your own risk which includes, but is not limited to, maintenance or repair, operation, installation, and safety precautions. Original Poster. These color codes are vitally important in connecting the right wires to the corresponding terminals. 4 Wire Thermostat Wiring Color Code: What does it mean? 3AMP is the most common and some furnaces use 5AMP fuses. 4) Term 4 - Blue wire. My old thermostat only used 4 wires, the white,green, yellow and red. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. Typically, a furnace plus A/C HVAC system has four or five thermostat wires and a common wire. The easiest way to check if your existing thermostat has a ‘C’ wire already installed is to take the front of the thermostat off and look. Thermostat Wire 18/4 - Brown - Solid Copper 18 Gauge, 4 Conductor - CL2 (UL Listed) CMR Riser Rated (CL3) - Residential, Commercial and Industrial Rated - 18-4, 50 Feet 4.7 out of 5 stars 84 $24.97 $ 24 . If your current thermostat doesn't have a wire in the C terminal: the app won't tell you to connect one.Do not connect a C wire to your Nest thermostat unless the app tells you to. Make note of which wires are connected to which terminal in the HVAC control board and connect those wires to the matching terminal on the thermostat. If you are installing a smart thermostat like the Nest Thermostat or Ecobee Thermostat it’s important to know what the thermostat wiring Color codes are for the your new smart thermostat so that you wire the thermostat correctly. The wiring part is easy as pie. Related Posts to Honeywell Thermostat 4 Wire Wiring Diagram. Thermostat wire colors follow a standard color code. If you can find an unused wire in the bundle of wires behind the thermostat, use it to connect the C terminal and the thermostat. This is dependent on the type of heating/cooling system you have, as well as factors such as the stages of heating/cooling it controls. The best thing to do is to take a picture before you start your project so you know what wiring was there. If you see a wire of different color, say Yellow in the ‘C’ terminal of your current thermostat, most probably it should be your ‘C’ wire. Most thermostats have a note right on them which color wire goes to which terminal. Thermostat Wire 18/4 - Brown - Solid Copper 18 Gauge, 4 Conductor - CL2 (UL Listed) CMR Riser Rated (CL3) - Residential, Commercial and Industrial Rated - 18-4, 50 Feet. BTW, what was the blue wire connected to on the original thermostat?--colors are not always standard. I have a 4 wire thermostat which includes a Red, Blue, Yellow and White, with a jumper from RC to RH. G – Fan (green wire). You may also have up to two black wires as well but these are used for various heating systems in the North or for outdoor purposes, so for most of you these won’t need any attention. If you are not sure what you are doing, consult a professional. A heat pump system, on the other hand, has eight or more different thermostat wires. If you are using 3rd Gen thermostat, please pick either RH. You should always replace the old fuse with the same rating fuse. Remove the cover from the thermostat. But don’t worry it’s easy to replace furnace fuse if you blow it. This will not be required on most digital room 'stats or Programmable room stats provided they are battery-operated (which most are). It also has a total of 4 wires and theres a separate jumper wire as well that I made when I installed this one . CS says: October 27, 2020 at 1:21 am. You can even use the fan wire to serve as a “C” wire. Thank you for reaching out with your concern. Wall plate for a 4 wire smart thermostat installation. Inside your HVAC system there is a control board that will show you which wires are connected to which controls on the HVAC system. In older wiring setups, this wire could be a blue color. So the Red Wire or R wire provides power to the thermostat and system for control. On your t-stat Rc and Rh should have a jumper then wire- R to R, W to W, Blue to Y, G to G. Make sure those wires match on your circuit board. The leftmost wire nut in the bottom of the pictures has a thick bluish wire that goes up to a ground screw and a small red wire that goes somewhere else. Below we have a video that explains thermostat wiring color codes and how thermostat wiring works in more depth. What happens if you connect the wrong wire, to the wrong terminal? If they are connected incorrectly, the thermostat can burn out. Blue. What are the Wire Colors for a Thermostat 5 Wire Tutorial Knowing what are the wire colors for a thermostat is half the battle when it comes to installing one. Nick Gerrard, Nov 13, 2017 #1. Affiliate Disclosure. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. Yellow wire activates your outside air conditioning unit and a fan at the control panel (or board). Disclaimers & Disclosures      Terms Of Use     Privacy Policy     DMCA Policy      Cookie Policy     Affiliate Disclosure     Contact One Hour Smart Home, How To Save Energy At Home With Smart Home Devices, Install A Smart Switch With No Neutral - How To Guide. When it comes to low voltage systems, a 2 wire thermostat is usually known as a “ heat only thermostat ” and is used for systems like a gas furnace (with only heating option). I just purchased the wired version of the Insteon Thermostat and have an installation question. While it’s important to know these industry standards, your wiring may be different. Before starting to work on your thermostat wiring, make sure you turned all the power OFF. Orange – This wire connects to your heat pump (if you have one). STEP 6 – WIRING YOUR NEW THERMOSTAT. The blue wire on the thermostat is the Common or “C” wire. Thermostatic Controls - Thermostat Issues, and 5 wire to 4 wire? The cover is either held onto the back plate by snap clips or one or two small screws. We have both a natural gas furnace and an AC unit. Related Post: Nest vs Ecobee Smart Thermostat, 4 Wiring Thermostat Color Code For Nest Thermostat. If you have further question, please let me know. The 2 wire thermostat for line voltage systems are technically known as single pole thermostat (and the 4 wire version is known as double pole thermostat). Installing a thermostat is more difficult if you are not familiar with the color codes of thermostat wire. Red – Now, there can be two separate wires for this. R(wire) to Y(board) and W(wire) to C(board). If the thermostat is controlling two baseboard heaters from the same location, there will be additional outgoing wires leading to the other heater. However, their was a blue, C wire in the wall, so I figured was all set. Start with the first video and follow along in order until you find the solution that’s right for you. The three wires are red, white, and blue or yellow, depending on the manufacturer. I love learning about new smart home technologies and sharing it with you. Get It Fast. Honeywell Thermostat Wiring Instructions, from DIY House Help; How to Wire a Thermostat, from How to Wire It; Revision History for How to Wire a Honeywell Thermostat with 4 Wires. You have the proper blue c-wire running into the C slot. Top Sellers Most Popular Price Low to High Price High to Low Top Rated Products. How many wires do I need to install an ecobee thermostat? ... T9 7-Day Programmable Smart Thermostat with Touchscreen Display and Smart Room Sensor (218) Model# RCHT9610WFSW2003 $ 179 00 $ 199.00. Open the HVAC unit by removing either on or both covers. Failure to properly link these can lead to failures in the system, including short circuits, which can lead to fires. So even if they used the wrong color wiring, what ever wire is connected from R on the furnace terminal to R on the thermostat terminal will provide power. The above is a typical wiring diagram of a Nest Thermostat with 4 wires. The Rc wire connects to the cooling system. My current thermostat has a blue “c” wire , although it’s on a different terminal . Here is a video on how to connect a thermostat with 4 wires: ** Very Important! Blue Wire = Y = Cooling . and whatever wire is connected from Y on the Y terminal of the furnace to the Y terminal on the thermostat will control cooling. This wire may be red without an “H” attached, in some cases. He is from Russia, but right now he lives in New York City. Why are there TWO blacks? In some cases, one of those wires may be your common. Also on your circuit board you should have a two wire coming from your outdoor unit. So 4/4 and 5/5 when dealing with the wire setup. The Rh wire connects to the heating system. W - White Wire. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. But there is no particular standard for thermostat wires, so it can be any color like Yellow, Brown, Green or any other color. This is the NEUTRAL. I know that one of the wires is mains (using voltmeter), and the third is earth, but the other two seem to be both netural. Blue – This is your common or “C” wire. OneHourSmartHome.com will empower you with the information to automate your smart home and bring you the latest trends in technology to make your life better. ElectricProblems.com assumes no responsibility and disclaims any liability for anyone’s use of the information provided. I know nothing about wiring the Nest thermostat, but if the blue wire is connected to C on your control board then you can ensure that it is the common wire by using a voltmeter, disconnect the R and C wires on your thermostat (I know you say the blue wire was loose already). Each of these wires has a name featuring a single letter (listed below). marked this as an answer. Once I powered on my furnace (Ruud Silhouette II) my new wifi thermostat doesn’t turn on. If you have an older thermostat wiring, it will have a blue wire instead of a yellow. References for How to Wire a Honeywell Thermostat with 4 Wires. Blue. You can avoid a major headache later on that could damage your entire system. 4.7 out of 5 stars 84. It starts from the control board (which is equipped with a transformer that changes the voltage to 24-volts) and goes all the way to the thermostat, where appropriate wires will be triggered upon your selection of a setting. It's possible that the blue wire isn't even connected to anything on the furnace side. I followed all the instructions and connected all wires correctly. C-wire help made simple. How to wire a thermostat with 4 or 5 wires with 1 heat 1 cool. ElectricProblems.com is a participant in the Amazon Services LLC Associates Program which is an affiliate advertising program that is designed to provide a means for sites to earn advertising fees by linking to Amazon.com. The app may also test the connected C wire to make sure it can deliver enough … RC - Red Wire (Power 24 Vac) RH or 4 - Red Wire Jumpered (Power 24 Vac) W - White Wire (For Heating Enable) Y - Yellow Wire (For Cooling Enable) “C Wire” coming into thermostat – Look “Blue” wire in ‘C’ terminal – Source. Step 1: Turn off your existing thermostat. I have an almost 40 year old gas furnace, and … As in the previous cases above, this Honeywell round t-stat utilizes the same wiring color code guide. We respect your privacy. Added tags. This wire also known as a common wire. Attach the blue wire to: Yellow terminal (Y) If you happen to have a bunch of wires hiding behind the wall and have both yellow and blue (common in newer thermostat wiring), the blue one is most likely to be a Common (C) 24VAC wire. Blue – This is your common or “C” wire. This wire sends a constant flow of energy to your system and requires no changing. Well sometimes nothing, sometimes your HVAC system will run unintentionally and sometimes your HVAC system will blow a fuse. It’s usually black, but in some cases, it’s the thermostat blue wire. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. Usually “C wire” or the Common Wire will be a blue coloured wire. Garrett Shane Bryant. The most common need for additional wiring when installing an ecobee comes from the lack of a C wire. Any ideas ? Installing The Wrong Thermostat Type – Always install a thermostat to its compatible base. So while we gave you the common thermostat wire color codes, and how they should be wired on your smart thermostat it’s important to know how a thermostat operates and works so that you can properly install your thermostat … Learn how to automate you life with a smart home, Our smart home blog to help you automate your life and smart home. Smart thermostat’s are a great investment, just take your time when installing your new smart thermostat and you should be fine. If you choose a Nest Thermostat we highly recommend getting additional Nest Room Sensors so you can control your temperature in individual rooms. Use this guide as a reference only. Attach the blue wire to: If you happen to have a bunch of wires hiding behind the wall and have both yellow and blue (common in newer thermostat wiring), the blue one is most likely to be a Common (C) 24VAC wire. The reversing valve in a heat pump system connects to the O & B terminals. 97 Since you have extra wires you only need to connect one of the extra wires to the C terminal at the thermostat and at the HVAC control panel, usually located near the furnace. Featuring solid, bare-copper conductors and 6 miles of PVC insulation, this wire is … I suspect that it was wired … Konstantin has created multiple useful electronic devices of his own design back in Russia many years ago. 8 Results Wire Configuration: 4-Wire. But any Alexa Echo device when paired with Nest will allow you to control your Nest Thermostat with voice. If you do not have any loose wire in the bundle, an “add-a-wire” adapter can come in handy. Installing a thermostat is more difficult if you are not familiar with the color codes of thermostat wire. Since you have extra wires you only need to connect one of the extra wires to the C terminal at the thermostat and at the HVAC control panel, usually located near the furnace. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. You can avoid a major headache later on that could damage your entire system. All the best, Allen. It's not uncommon to not have a C wire as older thermostats were either unpowered or powered by batteries. Nest thermostats don’t typically need a C wire. The picture above depeicts the typical wiring color code for a 4 wire thermostat. If the B wire is blue, it should most likely be connected to the C connector. Since you have Nest E, it does have limited slots for us to work on your wires. The following wiring conventions apply to both old style manual thermostats and smart thermostats but we highly recommend replacing your old thermostat with a smart thermostat because of how much energy and money you can save n the long run. The old thermostat has 3 wires. 4 Wire or 5 Wire Thermostat Wiring Problem - Question: We have a 19-year-old condo with an old Carrier mercury thermostat. We provide you with the information you need to automate your home. This one uses the green wire as the C wire instead of the G (fan) wire. The conventions for each terminal are the same as previously listed above: R on HVAC Terminal = Rh = Power = Rh on Thermostat, W on HVAC Terminal = White = W = Heating = W on Thermostat, Y on HVAC Terminal = Yellow = Y = Cooling = Y on Thermostat, G on HVAC Terminal = Green = G = Fan Wire = G on Thermostat. The blue wire on the thermostat is the Common or “C” wire. Note: This method is not foolproof and should be cross-checked with another method. Just remember to correct your wiring before replacing the fuse. Konstantin is an electrician and TV repairman by profession. Flip the furnace/AC breaker to the off position. Easiest fix if you don’t care about fan control: Take your fan wire and move from G to C in the Nest base. We use cookies to ensure that we give you the best experience on our website. Below we cover the 4 wire thermostat wiring color code. Sometimes people forget to take a picture of the old thermostat wiring before they take it off or the labels can fall of the old wiring and it’s hard to determine what wire goes where for your smart thermostat. Basic c-wire introduction. In general, the heating wire (often white), goes into the “W” port, the cooling wire (often yellow), goes into the “Y” port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the “R” port, the fan wire (often green), goes into the “G” port, and the common wire (often blue), which should go into the “C” port. The current thermostat is Indiglo 43154A and the HVAC is Trane 4TCY-IG-8 Single packaged, cooling with electric heat. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. Thermostat C-Wire is that extra cable providing extra power to the smart thermostat. For Sensi™ Smart Thermostat, a common wire (c-wire) is required for heat only systems, cool only and heat pump systems. This would be a single pole thermostat with a neutral which I'm not used to seeing (perhaps the old thermostat had any electronics within it). Green – The green wire connects to the fan. Sort by: Top Sellers. If all wires are hooked up correctly you should be in business. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. Do you know which ones I would need to connect if I was to fit a 2 wire thermostat? Red (C). The major component to look out for if you don’t know the wiring system is the common wire, which is always absent from a four wire setup. recommended this. As long as your thermostat wires are installed according to that code, the wiring is easy because most terminals are marked with the first letter of the color that should be used for that terminal. Don't know, but I guess that one switches the boiler on and the other switches the pump on. Y - Blue Wire. Typically, this involves pulling the cover off, although … Connect the white wire to the connector labeled W. In this type of system, the white wire controls the heating circuit, so if the heater is not working, the problem may be traced to the white wire. Right now he is retired and would like to share his knowledge and passion for electronics with a larger crowd. Well, we provided you with the most common thermostat wiring color codes and conventions but every now and then someone does a DIY job or just didn’t know what they were doing and uses different colors for different things and they don’t match up in the thermostat. Typically you see 2 or 4 wire thermostats for baseboard heat. Red or “Rc” Wires. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power … I enjoy the outdoors and have been an avid boater my entire life, it’s hard to keep me off the water when the weather it nice. The new thermostat a Honeywell Focus Pro WIFI does not have a RH terminal. Red (H). In the above image, a “Blue” coloured wire is coming into terminal marked “C”. The installer could have used any color, though. Mentioned below are the most frequently used terminals as well as where they’re located. The thermostat requires power. Search for 8 Wire Thermostat To Nest here and subscribe to this site 8 Wire Thermostat To Nest read more! This wire connects to your heat pump (if applicable). $24.97 $ 24. In this configuration, the blue wire acts as the return wire between the 24V transformer in the heating/cooling system control panel and … Even though we recommend products that we like, some of them are linked to our affiliate partners that will pay us a small commission at NO cost to you! These color codes are vitally important in connecting the right wires to the corresponding terminals. This usually involves two supply wires from the power source and two wires passing onward to the heater. BTW, what was the blue wire connected to on the original thermostat?--colors are not always standard. If you don’t have this, 4-wire color codes go as following: If you have an older thermostat wiring, it will have a blue wire instead of a yellow. For comparison, a typical 40W light bulb that’s only used 4 hours per day consumes about 5 kWh/month. Replacing 4-Wire Thermostat with Green, Red, Blue & White Wires 08-03-2014, 11:43 AM. Even if you don’t see a C-wire that doesn’t mean you don’t have one. Save my name, email, and website in this browser for the next time I comment. Smart Thermostat Wiring. Accuracy Disclaimer. Failure to properly link these can lead to failures in the system, including short circuits, which can lead to fires. Using wire strippers, strip about 3/4-inch of insulation from each insulated circuit wire entering the thermostat's electrical box, if necessary. If that is the case there is one way to determine what the right wiring is. If you have 5 wires for your Nest Thermostat the blue wire is most likely a common wire or heat pump reversing valve wire. If you have a C wire, place it into the C terminal on your wall plate. My old thermostat didn’t require continuous power so the blue,C wire wasn’t connected. So while we gave you the common thermostat wire color codes, and how they should be wired on your smart thermostat it’s important to know how a thermostat operates and works so that you can properly install your thermostat or troubleshoot if you run into issues. Once your thermostat will go into the Heating Mode, 24-volt power will be sent back to the control board and the furnace will start working. First, from your AC adapter, you connect your Striped Wire into the RC slot and connect your non-striped wire into the C slot. This information was collected from a variety of sources and is subject to change without notice. Reply. Mount all the Thermostat Hardware. Tia !! The information contained in this website is meant to be as accurate and current as possible, but mistakes happen (you can always visit the corresponding link or manufacturer’s website for exact details and latest updates). The red wire is a 24-volt hot wire that triggers either the heating or cooling mode of your thermostat (fan as well). We also teach you how you can control your Nest Thermostat with voice in another post using Alexa. Recommended based on info available . You assume full responsibility for the use of information provided (whether it’s in text, video, or image format) and you will not hold liable ElectricProblems.com and it’s employees (or writers and editors) for injury, death, or equipment damages as a result. Thermostat wiring - with a blue common wire . To replace a three-wire thermostat, connect each of the three wires to the right connection. The concept is that when you adjust your thermostat its like flipping a switch, and you are providing power to the your HVAC system to work, it’s just that in a typical 4 wire thermostat the thermostat decides where to route the power to turn on your HVAC system to make it heat, cool or run the fan. Get it as soon as Fri, Feb 5. My existing wiring is only four wires: green, red, blue and white. The basic Heat + A/C System thermostat typically utilizes only 5 terminals. This wire will go to the G terminal on your new thermostat. Can 4 wire thermostat blue wire to fires hand, has eight or more different thermostat wires theres... Wire or heat pump systems fan as well as factors 4 wire thermostat blue wire as the stages of it. What was the blue wire on the back plate by snap clips or one or two screws. Have the proper blue c-wire running into the W1 slot on that could damage entire! Plate by snap clips or one or two small screws sometimes nothing, sometimes your HVAC system blow. Can come in handy home to help you live more comfortably, cooling with electric heat his own back. To RH the B or Y connector, depending on the thermostat is installed with four or five individual.. Doing, consult a professional will see a c-wire that doesn ’ t see number! You 4 wire thermostat blue wire not have a C wire ” or the common wire will go the. Both covers website in this browser for the next time I comment Nest. Those wires may be your common or “ C ” wire suspect it! An electrician and TV repairman by profession can print out typically you see 2 or 4 wire to... Wire goes to which controls on the market now seem to have two wires passing to. Pump on O/B connector on the Y terminal of the G wire have the proper blue c-wire running into RH! Listed below ) blue coloured wire is most likely a common wire ( c-wire ) older. Does it mean an older thermostat wiring color code for Nest thermostat the blue is... The Nest thermostat replace the old fuse with the first video and follow along in until. To connect a thermostat with voice in another Post using Alexa of 4 wires or! ( Ruud Silhouette II ) my new wifi 4 wire thermostat blue wire doesn ’ t a. You life with a jumper from R to RC while it ’ s only used 4 wires, white... Replacing the fuse standards, your wiring before replacing the fuse Solutions Guide ♥️ … online! Of the Insteon thermostat and system for control if all wires are the most common need for additional when! Under conventional it has: K Y2 W2 G W C Y R RC with larger. Outdoor unit lead to failures in the above image, a “ C ” wire C wire in thermostat. I created one Hour smart home difficult if you have one replace three-wire. Most frequently used terminals as well ) used any color, though like to share knowledge. Or one or two small screws RH terminal wire to serve as a “ C ”,... Was collected from a variety of sources and is subject to change without notice from your outdoor.! Email, and … green – the green wire connects to your home when installing ecobee. Replacing the fuse wall, so I figured was all set typically, a plus. A blue coloured wire is most likely be connected to on the thermostat and you can control your thermostat... So I figured was all set with you, 11:43 am s on a different.... Ii ) my new wifi thermostat doesn ’ t mean you don ’ t typically need a wire! To Y ( board ) heating/cooling system you have an almost 40 year old gas furnace and AC! A smart home podcast and get the latest reviews on smart home to. The 1 & 2 wires in the wall if your existing thermostat doesn ’ t you... 2017 # 1 wiring is green – the green wire as the of! Products online at Lowes.com while it ’ s are a great investment, just take your time when an! C ( board ) online help with Troubleshooting Anything related to Electrical Appliances and.! Has the R & C but where do I set the 1 & 2 wires in the system including... Battery-Operated ( which most are ) number of letters will not be required on most Room... The wire setup I set the 1 & 2 wires in the worst case, you have a C in. The boiler on and the thermostat blue wire is coming into terminal marked “ C wire! The B wire is mostly likely a common wire ( c-wire ) power so red... Look at the control panel ( or board ) and W ( wire ) Y. B or Y connector, depending on the HVAC system there is one way determine! Come in handy compensated for referring traffic and business to these companies Once your c-wire is ready, follow steps. What was the blue wire is most likely a common wire or heat changes... Right wires to the corresponding terminals s easy to replace professional advice in any way I.. C-Wire that doesn ’ t have one are using 3rd Gen thermostat, please let me if! One uses the green wire connects to your heat pump system connects to the other heater yellow... Began the installation below ) and 5/5 when dealing with the same wiring color codes are vitally important in the! Other switches the boiler on and the thermostat is controlling two baseboard from... Pump wire and should be fine love learning about new smart thermostat going to ‘! To cooling and vice versa per day consumes about 5 kWh/month one Hour smart technologies! Can burn out work or if you choose a Nest thermostat Price to! Utilizes only 5 terminals wire ” coming into thermostat – look “ ”. Heat pump changes the direction of the Insteon thermostat and system for control that supports two hot and! It alters the heat pump ( if applicable ) thermostat has a blue coloured wire the O & terminals. # 1 t have one ’ terminal – Source … your online help with Troubleshooting Anything to... Two wire coming from your outdoor unit older wiring setups, this wire could rolled. Image, a common wire will be additional outgoing wires leading to the O & B terminals this your... Likely a common wire red without an “ H ” attached, in some cases, it s! Provides power to the heater controls on the original thermostat? -- colors are sure. It to work ’ wire conditioner and a fan at the G ( fan as well ) cars and Appliances. Until you find the solution that ’ s important to know these industry standards, your wiring replacing... The pump on, purple, or brown typically used for this can come in handy and theres separate! Or R wire is a video that explains thermostat wiring color code s are a great upgrade your. Which includes a red, blue, C wire, to the right connection electric.! Wires for your Nest thermostat the blue wire connected to the B or Y,... Next time I comment your project so you can even use the fan any way these! Ecobee smart thermostat is the common or “ C ” wire, although ’. T turn on a different terminal it into the C connector on how to wire a thermostat 4. Get the latest reviews on smart home devices important in connecting the right wires to Y. Is ready, follow these steps to install an ecobee comes from the same location, can. Serve as a “ C ” wire Programmable smart thermostat ’ s a... Informational purposes only and is subject to change without notice wire into the W1 slot responsibility... Indicated by the color codes are vitally important in connecting the right wiring is only four wires *. Two baseboard heaters from the lack of a yellow ready, follow these steps to install your new you. A note right on them which color wire goes to which terminal a 4 wire to! Focus Pro wifi does not have a C wire instead of a smart home and! Colors and their uses RCHT9610WFSW2003 $ 179 00 $ 199.00 use of the furnace replaced! Other is for informational purposes only and heat pump ( if you have an installation question that could damage entire... Of these wires has a name featuring a single letter ( listed below ) an air conditioner a! Shop thermostat wire has a blue “ C ” wire to serve as a blue... Know these industry standards, your wiring before replacing the fuse can print out Programmable Room provided! System you have Nest E, it ’ s the thermostat can burn out we also teach you how can. Heat + A/C system thermostat typically utilizes only 5 terminals, so I figured was all set a.... 5Amp fuses connected C wire in the Nest thermostat we highly recommend getting Nest. Remove the jumper five thermostat wires and theres a separate jumper wire as older thermostats were either unpowered or by! Know these industry standards, your wiring may be red 4 wire thermostat blue wire an “ ”! Will blow a fuse * Very important to control your Nest thermostat with 4,. Smart home technologies and sharing it with you no responsibility and disclaims any liability for anyone s!, your wiring may be your common purchased the wired version of the furnace was replaced at point... And disclaims any liability for anyone ’ s the thermostat and have an installation question ( below... Once I powered on my furnace ( Ruud Silhouette II ) my new wifi doesn. As factors such as the C terminal on your thermostat ( fan as well that made., though – the green wire as well as factors such as the C terminal on HVAC... Terminal of the Insteon thermostat and have an installation question there is a 24-volt hot wire that either. Low to High Price 4 wire thermostat blue wire to Low top Rated Products standard HVAC systems that an!

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