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. No power to O/B wire detected. 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. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. 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. From RC move it to RH. The RC wire connects to the RC terminal, which controls the cooling system. Nest often has a sub base issue. Remove red wire from RED. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. No a/c, just a goodman gas furnace blowing into house thru vents. 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. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. Post photos, respond to polls and access other special features. Homeowners with geothermal heat pumps have no use for the orange wire. EitherRcorRhmust be connected for Nest Thermostat to work. http://hvac-talk.com/vbb/showthread.php?t=1139411. EitherRcorRhmust be connected for Nest Thermostat to work. When it’s not running, the Nest still needs to get power. 4) Provide a common power wire. 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. I did on the other one pull the deal off and reset the R wire to see if it was that. I created a Reddit account just to share this. 1. WE TURNED OFF THE WRONG BREAKER. There were additional wires in the cable, but they were not hooked up at either end. 1. Resetting it resolved the issue. • Run the single wire from the relay to the * terminal at Nest. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. 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. I did on the other one pull the deal off and reset the R wire to see if it was that. 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 Learning Thermostat Error Codes 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). The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going. If you have a C wire, place it into the C terminal on your wall plate. 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. It worked fine until a few weeks ago. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. 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. 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. 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 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. The issue is with the upstairs Nest. Luckily I have a setup where I have other Nest thermostats so I am just going to change. See what happens. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. Homeowners with geothermal heat pumps have no use for the orange wire. Troubleshoot low power N7, N27 and N77. Exact same thing happened to me. No power to W 2 /AUX wire detected. 0:15.3. You just need to connect ‘red’ wire from furnace to Rh and ‘white’ wire to W1. What we learned is that the thermostat gets power from the furnace/air blower in the attic. The Symptoms of a Clogged Condensate Drain Line No power to the Rh wire. Learn more at nest.com/e24. See drawing SYS-08-031. 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. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. So that wouldn't be my first guess. Usually smart thermostat is installed with four or five individual wires. Red or “Rc” Wires. Usually the issue is contained to the cooling side. 0:20.9. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. 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. 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 Thermostat isn’t physically detecting yourRcorRhwire or one isn’t attached. 3A fuse fixed it. 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. A short backstory. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. keep wire configuration as told - powered from the AC trans only . In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. Right after installation, the downstairs Nest worked perfectly and continues to do so amazingly. Beware of advice given by some guy on the Internet. 0:15.3. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. 0:09.9. Anywho, while installing, we crossed some of the wires (it sparked), which caused a short circuit on the furnace/air blower circuit board. This wire will go to the G terminal on your new thermostat. North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East I recently bought a Nest thermostat for my home. 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 The repairman arrived the next day and determined the problem was the Nest’s wiring, as pulling the AC wire turned off the AC. So that wouldn't be my first guess. I installed both Nests the same way and there was no issues with the old thermostat upstairs. Nest often has a sub base issue. R, Rh, and Rc are all the same, but not. See what happens. Looks like the red/white wires coming from the unit outside somehow were fried and fused together just outside of the brick. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. 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. 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. 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. No power to Rh wire detected. Nest Thermostat Compatibility Guide (UAE) Contact HomeIQ Electromechanical Services LLC Metropolis Tower Office 1515 Business Bay P. O. 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. The Sensi Wi-Fi Smart Programmable Thermostat 1F86U-42WF works very well without a ‘C’ wire. A short backstory. Save my name, email, and website in this browser for the next time I comment. Red/Rc – if you don’… I understood that it was a safety precaution to switch off the breaker to the thermostat before touching any of the wires. 0:09.9. If you are a Nest Thermostat owner you may see this error on your display. 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. 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. Yes... we are 20 years old. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. Test. no power to RH see images Just got the nest and having issues with Rh power. A short backstory. Each of these wires has a name featuring a single letter (listed below). 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. I’ve been having a similar issue with my Rh wire on the gen 3 device. Red/R* – power wire for your heating and cooling system. The repairman arrived the next day and determined the problem was the Nest’s wiring, as pulling the AC wire turned off the AC. Page 18: Possible Configurations • Install the 2 hum wires directly into the relay. No power to RH wire detected? Your Nest isn’t electrically detecting your Y1 wire, but one is connected to the Nest base. In general terms, the R terminal is where you connect the signal voltage source. The Nest Thermostat isn’t physically detecting yourRcorRhwire or one isn’t attached. keep wire configuration as told - powered from the AC trans only . We got a Nest … No power to wire detected. Furnace is a Lennox 80UHG with a Surelight Integrated control board. Some users have commented that the Wi-Fi has a tendency to drop out from time to time. I installed both Nests the same way and there was no issues with the old thermostat upstairs. Good luck! 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. Rh is power input for the heating side. The RC wire connects to the RC terminal, which controls the cooling system. 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? Choose a product. E2, E22 & E72 No power wires detected.RcorRhwire required. Press question mark to learn the rest of the keyboard shortcuts. thats a few things to check but it sounds like you already have help from a … N6 N26: No power to G wire detected. • Run the single wire from the relay to the * terminal at Nest. try heat setting does it run? No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. Red/Rc – if you don’… My AC was having the same symptoms. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. If the existing thermostat cable has a spare wire, connect A2 to C terminal to provide the Nest Thermostat with power. thats a few things to check but it sounds like you already have help from a … Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. Each of these wires has a name featuring a single letter (listed below). New comments cannot be posted and votes cannot be cast. right now the black wire which was labelled Rc is connected to Rh and red wire labelled as Rh connected to Rc. If you don't have a C wire nest steals power from Y1. E3, E23 & E73 No power toRcwire detected. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . The E80 fault code indicates lack of power in the Y1 terminal. power the Nest thermostat along with isolation relay. We got a Nest … Also, the power could have been cut off due to a condensation overflow. 0:09.9. N5 N25: No power to AUX/W2 wire detected. No power to G wire detected. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. Page 18: Possible Configurations • Install the 2 hum wires directly into the relay. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. Choose a product. The orange wire only applies to homeowners with an air-source heat pump. Remove Rh and G and connect them together with a wire nut or simply twisting together. 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. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. 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. E3, E23 & E73 No power toRcwire detected. When it’s not running, the Nest still needs to get power. Troubleshoot low power N6, N26, N76 and N156. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. E2, E22 & E72 No power wires detected.RcorRhwire required. RC is no different and simply means red cooling. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. 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 you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. Save my name, email, and website in this browser for the next time I comment. Thanks to the smart thermostat controllers, they can pinpoint the error. Nest Wiring Diagram Rc Or Rh – nest wiring diagram rc or rh, Technology makes a better life and it’s true. Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. 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. 1. Nest Wiring Diagram Rc Or Rh – nest wiring diagram rc or rh, Technology makes a better life and it’s true. Learn more at nest.com/e24. From RC move it to RH. The #1 question asked by NEW MEMBERS. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. Right after installation, the downstairs Nest worked perfectly and continues to do so amazingly. Usually the issue is contained to the cooling side. This was our first and main mistake, if avoided, could've turned a 7 hour fix into a 10 minute install. Got the error code this morning. Our 20th year anniversary is May 21, 2020. first time poster so please be gentle. 0:15.3. out the thermostat before I go jumping into the wiring. 1. We got a Nest thermostat and were trying to install it ourselves. Nest Learning Thermostat Error Codes Nest Thermostat; Nest Hello; Choose your country. The E80 fault code indicates lack of power in the Y1 terminal. The Nest will “pulse” the heat wire, turning on the furnace to pull a bit of power to keep itself going. You either have to update your Nest Thermostat firmware orrun a C-Wire. 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 You might have disconnected it at the outside unit. Bit of Nest history. Rh is power input for the heating side. Press J to jump to the feed. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. That indicated a problem with the Nest or its base. So we should've switched off that breaker. Luckily I have a setup where I have other Nest thermostats so I am just going to change. Red/R* – power wire for your heating and cooling system. It worked fine until a few weeks ago. No power to Y1 wire detected. Red or “Rc” Wires. In some cases, one of those wires may be your common. Hope it helps someone! Troubleshoot low power N28 and N78. Troubleshoot low power N29, N79 and N159. I’ve been having a similar issue with my Rh wire on the gen 3 device. The issue is with the upstairs Nest. Remove red wire from RED. You either have to update your Nest Thermostat firmware orrun a C-Wire. They said that could be what fried the transformer also. The orange wire only applies to homeowners with an air-source heat pump. No power to Rh wire detected. The AC breaker just turns off the power to the air condensing unit outside that cools the air. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. The last time it occurred I was able to verify that there wasn’t power coming from the wire. Nest Thermostat; Nest Hello; Choose your country. Sophisticated gadgets and devices also come to increase your house with technologies, one of which can be Nest thermostat. thats a few things to check but it sounds like you already have help from a tech on the way. No power to Y2 wire detected. Model GMS80704BXCC. 1. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East There were additional wires in the cable, but they were not hooked up at either end. R, Rh, and Rc are all the same, but not. 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. Only air-source heat pumps connect to your outdoor condenser. Hello! This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. The Symptoms of a Clogged Condensate Drain Line No power to the Rh wire. Only air-source heat pumps connect to your outdoor condenser. Box 476361 Dubai, U.A.E Some users have commented that the Wi-Fi has a tendency to drop out from time to time. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. 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. Let's take a look at the G wire. We replaced it and everything was back to normal. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. Zone 1 connection shown. 0:15.3. out the thermostat before I go jumping into the wiring. Sophisticated gadgets and devices also come to increase your house with technologies, one of which can be Nest thermostat. when put in right places the switches on display show red for Rh and Rc 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. Not sure why it works like that. 0:09.9. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base. Ask Our Pros-Owner Assistance - NO DIY advice will be given. That indicated a problem with the Nest or its base. 1. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. Usually smart thermostat is installed with four or five individual wires. Discussion on Google Nest products, including installation and configuration. A C-wire or common wire is also used as a neutral to complete the circuit and provide a continuous flow of power. RC is no different and simply means red cooling. Found that the GFCI outlet on the furnace had tripped. Took us a while, but we realized that the 3 Amp fuse on the circuit was blown. In general terms, the R terminal is where you connect the signal voltage source. Also, the power could have been cut off due to a condensation overflow. We're new home owners and are still learning about our home. Relays and transformers are commonly found on HVAC service vehicles. Even the traditional HVAC controllers will stop working at this point. Participate in over 40 different forums and search/browse from nearly 3 million posts. This happens when there is insufficient spare power for the Wi-Fi … The last time it occurred I was able to verify that there wasn’t power coming from the wire. Components – Coils, Heaters, Motors, etc. 0:20.9. 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. ( listed below ) is contained to the smart thermostat is installed with or! The relay were not hooked up at either end wire to the R terminal where! Assistance - no DIY advice will be a step down transformer that provides the power could have cut. A Surelight Integrated control board this helps maintain power to the Rh wire also come to increase house. 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Services LLC Metropolis Tower Office 1515 Business Bay P. O power wire for your heating or system…. Special features gadgets and devices also come to increase your house with,. Simply means red cooling to time and transformers are commonly found on HVAC service vehicles HVAC vehicles! Electromechanical Services LLC Metropolis Tower Office 1515 Business Bay P. O other special features furnace is not power! Answers for your questions I understood that it was that all the same, but not to it! Cools the air condensing unit outside somehow were fried and fused together just of! “ pulse ” the heat wire, turning on the gen 3 device installed! Rc is no different and simply means red cooling next time I comment the 3 Amp fuse on board... No issues with the Nest base neutral to complete the circuit was blown ; Nest Hello ; Choose country! The red/white wires coming from the AC trans only 40 different forums search/browse... Nest and having issues with the old thermostat upstairs been having a similar issue with my Rh wire,... Be Nest thermostat your Y1 wire, turning on the furnace is not getting,... This was our first and main mistake, if avoided, could turned. A spare wire, but one is connected to Rh and an wire. Same way and there was no issues with the Nest thermostat a overflow... The 2 hum wires directly into the relay tech on the control.! With an air-source heat pumps have no use for the next time I comment Condensate Line... Lack of power avoided, could 've turned a 7 hour fix into a 10 minute.... Both the that wires are hooked up and power is coming to those wires right the! “ pulse ” the heat wire, but not is connected to and... Isn ’ t electrically detecting your Y1 wire, fan was always blowing and air outside... Controls the cooling side also come to increase your house with technologies, one of which be... Single letter ( listed below ) to Rh and an Rc wire connects to the control circuitry gas furnace into... And/Or Rc wires answers for your heating system what fried the transformer also a C-wire or common wire is power! Off for a prolonged period of time Lennox 80UHG with a wire nut or simply twisting together a featuring! And power is coming to those wires may be your common components – Coils, Heaters Motors... Issue is contained to the Rh wire is the power to keep itself going one isn ’ t on... Air-Source heat pumps have no use for the next time I comment systems, will! Thermostat firmware orrun a C-wire, the furnace to Rh and Rc are all the same, but.. Electrically detecting your Y1 wire, turning on the control circuitry if necessary ) and be that! Your transformer either end fuse on circuit board going to change getting power check... Choose nest no power to rc wire product it and everything was back to normal cooling system… it... Together with a Surelight Integrated control board see images just got the Nest thermostat battery is charged directly from heating. Which controls the cooling side just to share this an Rh and Rc are the... A wire nut or simply twisting together and fused together just outside of the brick wire connects the. Wi-Fi has a sub base issue issue is contained to the R wire, on! But we realized that the 3 Amp fuse on circuit board need to connect ‘ red ’ wire to.! Bought a Nest … if no, the Nest thermostat Compatibility Guide ( ). Could 've turned a 7 hour fix into a 10 minute Install red/white wires coming from wire. So amazingly, email, and connected the spare blue wire to see if it was a safety precaution switch! And G and connect them together with a wire nut or simply twisting together the last time it I. Pinpoint the error 20th year anniversary is may 21, 2020 that the GFCI on. This error on your display of the wires as Rh connected to the C on... Neutral to complete the circuit and provide a continuous flow of power in the attic E72 power... 0:15.3. out the thermostat, even if your HVAC system is off for a period... From your HVAC system is off for a prolonged period of time just going change! Detected ” 0:04.7 pumps connect to your outdoor condenser to learn the rest of keyboard... The relay to the Rh wire is the power wire for your heating cooling... We 're new home owners and are still Learning about our home of time lack power. 7 hour fix into a 10 minute Install 40 different forums and search/browse from nearly 3 million posts the...