Press question mark to learn the rest of the keyboard shortcuts. The repairman arrived the next day and determined the problem was the Nest’s wiring, as pulling the AC wire turned off the AC. The #1 question asked by NEW MEMBERS. Discussion on Google Nest products, including installation and configuration. You either have to update your Nest Thermostat firmware orrun a C-Wire. This happens when there is insufficient spare power for the Wi-Fi … When it’s not running, the Nest still needs to get power. Remove red wire from RED. This wire will go to the G terminal on your new thermostat. There were additional wires in the cable, but they were not hooked up at either end. Nest Wiring Diagram Rc Or Rh – nest wiring diagram rc or rh, Technology makes a better life and it’s true. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. I understood that it was a safety precaution to switch off the breaker to the thermostat before touching any of the wires. The last time it occurred I was able to verify that there wasn’t power coming from the wire. 0:20.9. Important Note: In dual transformer set ups (where there is both an Rh and an Rc wire connected to Nest), Nest will power the * connector from the Rh wire. Save my name, email, and website in this browser for the next time I comment. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. Hope it helps someone! Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. Looks like the red/white wires coming from the unit outside somehow were fried and fused together just outside of the brick. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. Components – Coils, Heaters, Motors, etc. A short backstory. See what happens. E2, E22 & E72 No power wires detected.RcorRhwire required. If you are a Nest Thermostat owner you may see this error on your display. This may happen if you’ve forgotten to turn the power back on to the HVAC system or if you turned the power back on, but there was a fuze or breaker blown during the installation process. What we learned is that the thermostat gets power from the furnace/air blower in the attic. When I hook up the blue wire to the C terminal on the Nest base, I get the red symbol indicating no power to Rh...but if I remove the common, it all works fine The Nest learning, 2 nd Generation also claims to be able to work without a ‘C’ wire as it ‘borrows’ the power from the ‘D’ and ‘G’ wire. Red/Rc – if you don’… 0:15.3. out the thermostat before I go jumping into the wiring. Exact same thing happened to me. The Symptoms of a Clogged Condensate Drain Line No power to the Rh wire. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . The orange wire only applies to homeowners with an air-source heat pump. I came across this post while googling how I could fix my AC system, so I just want to share my experience in case anyone might find it useful. Beware of advice given by some guy on the Internet. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. No power to Rh wire detected. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going. No power to Y2 wire detected. 1. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. Remove Rh and G and connect them together with a wire nut or simply twisting together. 0:09.9. keep wire configuration as told - powered from the AC trans only . When I hook up the blue wire to the C terminal on the Nest base, I get the red symbol indicating no power to Rh...but if I remove the common, it all works fine Model GMS80704BXCC. I came across this post while googling how I could fix my AC system, so I just want to share my experience in case anyone might find it useful. I recently bought a Nest thermostat for my home. Also, can you provide me with the following information - Model number of the furnace, model number of Nest and make and model of old thermostat and I will deal with Nest for you to get proper wiring at this point. right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. WE TURNED OFF THE WRONG BREAKER. The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. That indicated a problem with the Nest or its base. The RC wire connects to the RC terminal, which controls the cooling system. It worked fine until a few weeks ago. Choose a product. Red/R* – power wire for your heating and cooling system. The Sensi Wi-Fi Smart Programmable Thermostat 1F86U-42WF works very well without a ‘C’ wire. Right after installation, the downstairs Nest worked perfectly and continues to do so amazingly. They said that could be what fried the transformer also. Rh is power input for the heating side. Learn more at nest.com/e24. Luckily I have a setup where I have other Nest thermostats so I am just going to change. When doing your own research on the Nest pulsing problem, look for terms like: pulsing, cycling, short cycle, power leeching, no c-wire, heat-only and cooling-only. 0:09.9. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. first time poster so please be gentle. RULES for AOP - Owner Assistance and Contractors, The ARPA Zone/Open Membership Discussion Forums, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. There were additional wires in the cable, but they were not hooked up at either end. Nest often has a sub base issue. 3A fuse fixed it. The Nest Thermostat isn’t physically detecting yourRcorRhwire or one isn’t attached. Red or “Rc” Wires. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. We got a Nest … If you have a C wire, place it into the C terminal on your wall plate. http://hvac-talk.com/vbb/showthread.php?t=1139411. Box 476361 Dubai, U.A.E Nest Thermostat Compatibility Guide (UAE) Contact HomeIQ Electromechanical Services LLC Metropolis Tower Office 1515 Business Bay P. O. Bit of Nest history. I installed both Nests the same way and there was no issues with the old thermostat upstairs. Page 18: Possible Configurations • Install the 2 hum wires directly into the relay. Update Amazon now offers free in home Smart Home Consultation When I removed the old thermostat, the wires were connected to W1, Rh and G. The Nest would not stay charged, so I read enough to realize I would need a common wire. thats a few things to check but it sounds like you already have help from a … The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. E3, E23 & E73 No power toRcwire detected. Let's take a look at the G wire. 1. I did on the other one pull the deal off and reset the R wire to see if it was that. 0:15.3. I did on the other one pull the deal off and reset the R wire to see if it was that. 0:20.9. Hello! The most common reason for error code e73 / no power to Rc wire detected to appear on the Nest Gen3 display is usually due to AC outdoor unit/compressor shutting down which in turn shuts down power to the Nest thermostat. Participate in over 40 different forums and search/browse from nearly 3 million posts. Nest Wiring Diagram Rc Or Rh – nest wiring diagram rc or rh, Technology makes a better life and it’s true. I installed both Nests the same way and there was no issues with the old thermostat upstairs. 4) Provide a common power wire. Resetting it resolved the issue. Even the traditional HVAC controllers will stop working at this point. Post photos, respond to polls and access other special features. Each of these wires has a name featuring a single letter (listed below). In general terms, the R terminal is where you connect the signal voltage source. See drawing SYS-08-031. Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. You might have disconnected it at the outside unit. Usually smart thermostat is installed with four or five individual wires. I created a Reddit account just to share this. Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. Some users have commented that the Wi-Fi has a tendency to drop out from time to time. When it’s not running, the Nest still needs to get power. Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems. Substituting a G Wire for a C Wire As you will notice from the information above, your ‘G’ wire connects to the fan (as industry standard) and is green in color. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. Take your 24v transformer put one wire in Rh the other in C. Connect a 2nd wire to C and run that to one terminal on the power side of the relay, connect a wire to W1 on the thermostat and run that to the other terminal on the power side of your relay… Then connect the two wires you set aside to the normally open side of your relay. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no heat, its cool air. The RC wire connects to the RC terminal, which controls the cooling system. Found that the GFCI outlet on the furnace had tripped. Substituting a G Wire for a C Wire As you will notice from the information above, your ‘G’ wire connects to the fan (as industry standard) and is green in color. I’ve been having a similar issue with my Rh wire on the gen 3 device. You either have to update your Nest Thermostat firmware orrun a C-Wire. Nest Thermostat; Nest Hello; Choose your country. From RC move it to RH. Save my name, email, and website in this browser for the next time I comment. So that wouldn't be my first guess. R, Rh, and Rc are all the same, but not. From RC move it to RH. New comments cannot be posted and votes cannot be cast. Each of these wires has a name featuring a single letter (listed below). Rh is power input for the heating side. No power to W 2 /AUX wire detected. The issue is with the upstairs Nest. A note on 'power stealing' Other models, like the Nest Learning Thermostat and the Honeywell Lyric can use a C wire, but they don't require it. No power to O/B wire detected. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. In general terms, the R terminal is where you connect the signal voltage source. Nest Learning Thermostat Error Codes N5 N25: No power to AUX/W2 wire detected. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. RC is no different and simply means red cooling. E3, E23 & E73 No power toRcwire detected. 0:09.9. Homeowners with geothermal heat pumps have no use for the orange wire. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . 1. I came across this post while googling how I could fix my AC system, so I just want to share my experience in case anyone might find it useful. EitherRcorRhmust be connected for Nest Thermostat to work. The AC breaker just turns off the power to the air condensing unit outside that cools the air. The repairman arrived the next day and determined the problem was the Nest’s wiring, as pulling the AC wire turned off the AC. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. Press J to jump to the feed. The Nest Thermostat isn’t physically detecting yourRcorRhwire or one isn’t attached. thats a few things to check but it sounds like you already have help from a tech on the way. The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going. Took us a while, but we realized that the 3 Amp fuse on the circuit was blown. We replaced it and everything was back to normal. Good luck! 0:15.3. out the thermostat before I go jumping into the wiring. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. That indicated a problem with the Nest or its base. Remove red wire from RED. E2, E22 & E72 No power wires detected.RcorRhwire required. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. If the existing thermostat cable has a spare wire, connect A2 to C terminal to provide the Nest Thermostat with power. If Heat does not turn on , try Rc to Rh wire switch , if AC or heat does not then base is no good , order new base from nest. The E80 fault code indicates lack of power in the Y1 terminal. See what happens. Not sure why it works like that. no power to RH see images Just got the nest and having issues with Rh power. No power to Y1 wire detected. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. Sophisticated gadgets and devices also come to increase your house with technologies, one of which can be Nest thermostat. try heat setting does it run? Also, the power could have been cut off due to a condensation overflow. Homeowners with geothermal heat pumps have no use for the orange wire. R, Rh, and Rc are all the same, but not. My AC was having the same symptoms. No power to wire detected. keep wire configuration as told - powered from the AC trans only . Yes... we are 20 years old. Troubleshoot low power N6, N26, N76 and N156. Your Nest isn’t electrically detecting your Y1 wire, but one is connected to the Nest base. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. thats a few things to check but it sounds like you already have help from a … Sophisticated gadgets and devices also come to increase your house with technologies, one of which can be Nest thermostat. Also, can you provide me with the following information - Model number of the furnace, model number of Nest and make and model of old thermostat and I will deal with Nest for you to get proper wiring at this point. Relays and transformers are commonly found on HVAC service vehicles. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base. Some users have commented that the Wi-Fi has a tendency to drop out from time to time. Red or “Rc” Wires. Usually the issue is contained to the cooling side. The jumper between R and Rc might have come out unless it’s an2 transformer type system or the wires shorted and blew the fuse on the furnace board,typically a 3 or 5 amp fuse (low voltage) 354 views Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. The first week it ran fine, but then after that it would turn off and say there's no power going into the Rc port. Only air-source heat pumps connect to your outdoor condenser. No power to RH wire detected? We got a Nest … Nest Learning Thermostat Error Codes I’ve been having a similar issue with my Rh wire on the gen 3 device. RC is no different and simply means red cooling. Note that “pulsing” is a term the Nest community has come up with for the problem, and Nest themselves do not seem to name this problem in any specific way. Nest explains and we agree that you can simplify the electrical wiring by tossing un-needed jumper wires; for example, a wire labeled as "R" (usually this is a red wire) can be connected to either a terminal marked RC (red wire for cooling) or RH (red wire for heating). 0:15.3. Also, the power could have been cut off due to a condensation overflow. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. Usually the issue is contained to the cooling side. If you don't have a C wire nest steals power from Y1. No power to Rh wire detected. A short backstory. Nest often has a sub base issue. N6 N26: No power to G wire detected. Troubleshoot low power N7, N27 and N77. • Run the single wire from the relay to the * terminal at Nest. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. power the Nest thermostat along with isolation relay. Troubleshoot low power N29, N79 and N159. So we should've switched off that breaker. Learn more at nest.com/e24. If Heat does not turn on , try Rc to Rh wire switch , if AC or heat does not then base is no good , order new base from nest. The issue is with the upstairs Nest. Test. Ask Our Pros-Owner Assistance - NO DIY advice will be given. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. EitherRcorRhmust be connected for Nest Thermostat to work. 1. 1. Our 20th year anniversary is May 21, 2020. Check and make sure the blower door is on the furnace/ air handler, make sure the kill switch and breaker to furnace is on, turn the thermostat to fan on does the blower to furnace run? The E80 fault code indicates lack of power in the Y1 terminal. No a/c, just a goodman gas furnace blowing into house thru vents. It worked fine until a few weeks ago. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. Red/Rc – if you don’… Page 18: Possible Configurations • Install the 2 hum wires directly into the relay. We're new home owners and are still learning about our home. No power to G wire detected. Red/R* – power wire for your heating and cooling system. The first week it ran fine, but then after that it would turn off and say there's no power going into the Rc port. North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East Troubleshoot low power N28 and N78. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. Red/Rh – if you don’t have an Rc wire (described below), the Rh wire is the power wire for both – heating and cooling systems. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. 0:09.9. Important Note: In dual transformer set ups (where there is both an Rh and an Rc wire connected to Nest), Nest will power the * connector from the Rh wire. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. Got the error code this morning. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. This was our first and main mistake, if avoided, could've turned a 7 hour fix into a 10 minute install. Usually smart thermostat is installed with four or five individual wires. • Run the single wire from the relay to the * terminal at Nest. This may happen if you’ve forgotten to turn the power back on to the HVAC system or if you turned the power back on, but there was a fuze or breaker blown during the installation process. The Symptoms of a Clogged Condensate Drain Line No power to the Rh wire. 1. Zone 1 connection shown. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Nest Thermostat; Nest Hello; Choose your country. when put in right places the switches on display show red for Rh and Rc North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East Right after installation, the downstairs Nest worked perfectly and continues to do so amazingly. The orange wire only applies to homeowners with an air-source heat pump. Luckily I have a setup where I have other Nest thermostats so I am just going to change. The jumper between R and Rc might have come out unless it’s an2 transformer type system or the wires shorted and blew the fuse on the furnace board,typically a 3 or 5 amp fuse (low voltage) 354 views If no, the furnace is not getting power, check door, breaker, fuse on circuit board. In some cases, one of those wires may be your common. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. Only air-source heat pumps connect to your outdoor condenser. Anywho, while installing, we crossed some of the wires (it sparked), which caused a short circuit on the furnace/air blower circuit board. Choose a product. The Nest learning, 2 nd Generation also claims to be able to work without a ‘C’ wire as it ‘borrows’ the power from the ‘D’ and ‘G’ wire. Accessories – Pumps, Cooling Towers, Evap Condensers, etc, Components – Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. Furnace is a Lennox 80UHG with a Surelight Integrated control board. So that wouldn't be my first guess. A short backstory. Thanks to the smart thermostat controllers, they can pinpoint the error. We got a Nest thermostat and were trying to install it ourselves. The last time it occurred I was able to verify that there wasn’t power coming from the wire.