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. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. 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? These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. Your Nest isn’t electrically detecting your Y1 wire, but one is connected to the Nest base. The Sensi Wi-Fi Smart Programmable Thermostat 1F86U-42WF works very well without a ‘C’ wire. Homeowners with geothermal heat pumps have no use for the orange wire. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. They said that could be what fried the transformer also. no power to RH see images Just got the nest and having issues with Rh power. No power to O/B wire detected. 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. I installed both Nests the same way and there was no issues with the old thermostat upstairs. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. Ask Our Pros-Owner Assistance - NO DIY advice will be given. Nest often has a sub base issue. 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. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . WE TURNED OFF THE WRONG BREAKER. We got a Nest thermostat and were trying to install it ourselves. 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. 0:15.3. out the thermostat before I go jumping into the wiring. These 2 connections will set the Nest thermostat as a ‘smart 2 wire thermostat’ taking care of your home heating ‘smartly’. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. If no, the furnace is not getting power, check door, breaker, fuse on circuit 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 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. 0:20.9. 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 first week it ran fine, but then after that it would turn off and say there's no power going into the Rc port. See what happens. Nest Wiring Diagram Rc Or Rh – nest wiring diagram rc or rh, Technology makes a better life and it’s true. 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. 0:15.3. out the thermostat before I go jumping into the wiring. Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. thats a few things to check but it sounds like you already have help from a tech on the way. E2, E22 & E72 No power wires detected.RcorRhwire required. 0:15.3. Page 18: Possible Configurations • Install the 2 hum wires directly into the relay. No power to wire detected. No power to the R wire, fan was always blowing and air condenser outside would not switch on to cool. EitherRcorRhmust be connected for Nest Thermostat to work. Our 20th year anniversary is May 21, 2020. Nest often has a sub base issue. North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East I did on the other one pull the deal off and reset the R wire to see if it was that. N5 N25: No power to AUX/W2 wire detected. Relays and transformers are commonly found on HVAC service vehicles. A short backstory. There were additional wires in the cable, but they were not hooked up at either end. RC is no different and simply means red cooling. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. No power to W 2 /AUX wire detected. Red/R* – power wire for your heating and cooling system. New comments cannot be posted and votes cannot be cast. Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. Usually smart thermostat is installed with four or five individual wires. The Nest thermostat battery is charged directly from your HVAC system via the Rh and/or Rc wires. Nest Thermostat; Nest Hello; Choose your country. Go to settings - equipment - pro setup - turn all yellow lights green by selecting your new configuring , and all will be fine . It worked fine until a few weeks ago. 0:15.3. Luckily I have a setup where I have other Nest thermostats so I am just going to change. 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. Bit of Nest history. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. 0:09.9. 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. Learn more at nest.com/e24. Check the wiring, reconfigure it (if necessary) and be sure that the device is using AC. E2, E22 & E72 No power wires detected.RcorRhwire required. Each of these wires has a name featuring a single letter (listed below). N6 N26: No power to G wire detected. thats a few things to check but it sounds like you already have help from a … Red or “Rc” Wires. The E80 fault code indicates lack of power in the Y1 terminal. Sophisticated gadgets and devices also come to increase your house with technologies, one of which can be Nest thermostat. Model GMS80704BXCC. Took us a while, but we realized that the 3 Amp fuse on the circuit was blown. This wire will go to the G terminal on your new thermostat. Beware of advice given by some guy on the Internet. 1. From RC move it to RH. Your Nest isn’t electrically detecting your AUX/W2 wire, but one is connected to the Nest base. 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. I recently bought a Nest thermostat for my home. No power to Rh wire detected. We got a Nest … Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. Hello! Post photos, respond to polls and access other special features. Zone 1 connection shown. We got a Nest … If you are a Nest Thermostat owner you may see this error on your display. Homeowners with geothermal heat pumps have no use for the orange wire. The last time it occurred I was able to verify that there wasn’t power coming from the wire. Save my name, email, and website in this browser for the next time I comment. This was our first and main mistake, if avoided, could've turned a 7 hour fix into a 10 minute install. I’ve been having a similar issue with my Rh wire on the gen 3 device. 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. We're new home owners and are still learning about our home. Usually the issue is contained to the cooling side. keep wire configuration as told - powered from the AC trans only . RC is no different and simply means red cooling. 3A fuse fixed it. 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. The issue is with the upstairs Nest. 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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. That indicated a problem with the Nest or its base. If no, the furnace is not getting power, check door, breaker, fuse on circuit board. I’ve been having a similar issue with my Rh wire on the gen 3 device. E3, E23 & E73 No power toRcwire detected. Box 476361 Dubai, U.A.E http://hvac-talk.com/vbb/showthread.php?t=1139411. 1. I understood that it was a safety precaution to switch off the breaker to the thermostat before touching any of the wires. What we learned is that the thermostat gets power from the furnace/air blower in the attic. 1. Nest doesn’t turn on until it senses both the that wires are hooked up and power is coming to those wires. The Symptoms of a Clogged Condensate Drain Line No power to the Rh wire. The #1 question asked by NEW MEMBERS. The RC wire connects to the RC terminal, which controls the cooling system. A short backstory. 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). If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. 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. Got a Nest thermostat here says, “No power to R wire detected” 0:04.7. There were additional wires in the cable, but they were not hooked up at either end. Troubleshoot low power N29, N79 and N159. 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. R, Rh, and Rc are all the same, but not. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. 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 • Run the single wire from the relay to the * terminal at Nest. Without a C-wire, the Nest gets its power from your heating or cooling system… assuming it’s running. 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. Some users have commented that the Wi-Fi has a tendency to drop out from time to time. 0:20.9. You either have to update your Nest Thermostat firmware orrun a C-Wire. Participate in over 40 different forums and search/browse from nearly 3 million posts. Learn more at nest.com/e24. Test. The orange wire only applies to homeowners with an air-source heat pump. North America; Canada (English); Canada (Français); México (Español); United States (English); Europe and Middle East Troubleshoot low power N7, N27 and N77. 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. So that wouldn't be my first guess. The issue is with the upstairs Nest. 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. Hope it helps someone! 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. Also, the power could have been cut off due to a condensation overflow. Nest Thermostat Compatibility Guide (UAE) Contact HomeIQ Electromechanical Services LLC Metropolis Tower Office 1515 Business Bay P. O. No power to RH wire detected? Red/Rc – if you don’… • Run the single wire from the relay to the * terminal at Nest. Luckily I have a setup where I have other Nest thermostats so I am just going to change. This helps maintain power to the thermostat, even if your HVAC system is off for a prolonged period of time. Not sure why it works like that. EitherRcorRhmust be connected for Nest Thermostat to work. The Nest 3rd Gen thermostat has 10 terminals, say Rh, Rc, W1,W2(aux) Y1, Y2, O/B, G, C, etc. Choose a product. 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. It worked fine until a few weeks ago. 0:09.9. In some cases, one of those wires may be your common. Furnace is a Lennox 80UHG with a Surelight Integrated control board. From RC move it to RH. You either have to update your Nest Thermostat firmware orrun a C-Wire. 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