T40 Nest Thermostat E User Manual Labs. My Heat Only System Has Two Or Three Wires Connected To The Thermostat Am I Compatible With Ecobee. Installer Guide 2 Final. E74 no power to rh wire on nest thermostat solved mashtips 2 0 and lennox heatpump wiring how install with trane axiom water source heat pump …The steps to install your thermostat are : Step 1 – Get the C-Wire Adapter. Step 2 – Check the Thermostat Terminals. Step 3 – Make Necessary Connections to the Thermostat. Step 4 – Connect the …Jun 1, 2023 · Here are the steps to charge your Nest thermostat manually: Firstly, remove the thermostat from the wall. Next, find the micro USB port by looking at the two connectors on the back panel. Connect the thermostat to the port. Lastly, leave it for a few hours until the battery gets fully charged.Sep 15, 2023 · Check your R-wire. The next step is checking your R-wire to see it’s frayed. To do this, you have to turn off the power at the breaker. Now, remove the R-wire and straighten it. Finally, insert the wire back to the R connector. If the button stays pressed down even after you let go, the issue should be fixed.A wire transfer is a method of transferring money electronically between two people or institutions. A wire transfer is a method of transferring money electronically between two pe...To check the wiring of your thermostat, follow the below mentioned steps. STEP 1 - Turn OFF all the breakers to which your HVAC system is connected. Disconnect your HVAC system to continue the process. STEP 2 - Remove the face plate of your thermostat to have a clear look at the wires. STEP 3 - Now you have to disconnect the RC wire and ...The N errors represent non-critical errors that don't interfere with the operation of the Nest. That being said, if there is anything unexpected happening with HVAC equipment, we definitely want to speak to you in real-time, over the phone so we can get to the bottom of the issue.No rh wire detected. So I am trying to plug in the nest generation 3 and I have some problems. It says there is an E74 no power to Rh wire. The wires I had were white, yellow, green orange, red and cyan. I plugged them all correctly into the unit, and nothino. Any advice?no power to Rh wire after install. The colors of the wire may not represent their actual label. Can you take a picture of the control board that the other side of the thermostat wire is connected to. I moved to a new house and was looking to replace the old mercury Honeywell thermostat. I had a 3rd gen learning thermostat before whish was ...In this video I will be fixing an air conditioner that wont come on, because the thermostat isn't getting power. If you find this video helpful, subscribe. I...I just hooked my Nest 3rd gen thermostat to my split heating/cooling system with a Common wire coming from the air handler in my ceiling. On my old stat I didnt use a common because it was battery powered. With everything hooked up my AC/fan is running fine but my heat won't kick on.Is the Ring doorbell the best video doorbell? Or the Google Nest Hello doorbell? Here's what to know about the best video doorbells on sale. By clicking "TRY IT", I agree to receiv...The RH wire stands for "heating power" and is responsible for supplying current to your heating system. When the thermostat calls for heating, it sends a signal through the RH wire, activating the furnace. Similar to the RC wire, the RH wire is usually red and connects to the RH terminal on the control board. However, in some installations, the ...Jan 1, 2015 · I have power to RH, the W and the C and the G are connected, voltmeter confirms there is 24 volts between RH & C, RH & W, RH & G, but still getting E24 , could it be a bad nest? I gave it plenty of ti …Oct 29, 2021 · Admittedly, this doesn’t have much to do with the Nest itself, but the effects from it can have ramifications throughout the system. 2. Get in Touch with a Technician or Call Customer Support. If you have the know-how, you could also go and check your wiring to see if you notice anything that seems odd.Tap on the E74 Error: RH wire no power code that appears on the monitor. You will then be sent to the diagram's "Tech Info" page. To check for loose wire connections, review the tech info diagram. Any exposed wires are marked red on the diagram. If the Rh wire is red in color, then, most likely, the connection is faulty.One possible solution for the rc wire nit providing power to your nest thermostat.The R wire is the power wire for your heating and cooling system. If you only have one R wire (no Rh or Rc), you can connect your R wire to either Rc or Rh on the Nest thermostat. Note: Don't connect any Jumper wires to the Nest thermostat. Rh: If you don’t have an Rc wire, the Rh wire is the power wire for both your heating and cooling systems.It really sounds like popped the fuse. Easy way to check if you're getting power to the stat is by charging the face of the nest using a micro usb . Charge it for about 10 min pop it on the wall. If it gives a code of E74 or no power to the Rh or Rc wire the unit is not sending power to the stat.Setting up and maintaining a bluebird house properly can take a bit of attention, but it's really quite easy. Follow these helpful tips to find out how. Expert Advice On Improving ...No Power to Rh Wire. Thermostat. Out of nowhere tonight, my Nest 3G suddenly gave me a "no power to Rh" message. It's been running fine for 1-1/2 years. Yes, I have a C wire. And the Nest power seems to be fine (~3.8v). Also, the Nest says it will still work, I just can't control it from the app. But the system isn't turning on at all ...Nest no power to r wire comments. r/tdi. r/tdi. Members Online. Dpf and tune question comments. r/BoltEV. r/BoltEV. Chevy Bolt EV, EUV, and Opel Ampera-e ... no power to Rh wire after install comments. r/Amtrak. r/Amtrak. r/Amtrak is for anything Amtrak related. News, photos, questions, and more.1.1 Option 1: Check the Circuit Breaker. 1.2 Option 2: Check that the Red Wire is Connected Correctly. 1.3 Option 3: Check the Thermostat Battery. 1.4 Option 4: Condensation Overflow & Float Switch Triggered. 1.5 Option 5: Blown Fuse at HVAC Control Board. 1.6 Option 6: Replace your Air Filters.Is an Rc wire the same as a C wire? No. In the case of only one R cable, the Rc wire powers the heating and cooling system. If you have an Rh and an Rc wire, the Rc wire powers the air conditioner. The C wire provides power to the thermostat.Nest maintains that you don’t need a C wire for the thermostat to run. This is true.With separate red wires (one R for the heating and Rc for cooling) you need the Nest Learning thermostat that has a Rh for your R wire and an Rc. Also advise connecting the blue wire to C at the new thermostat and at the air handler to provide stable power for the new thermostat. 2. Reply. Gio235.Ok, story to tell you this then. I too bought a 2nd gen Nest on eBay. "Never Installed," the ad said, but the wire labels were used. Okkkkk. Had the same problems, even used a C wire. Nest said the base was bad. I sent the seller the Nest results and they refunded me the sale. Bought another oneI have a baseboard oil fired 35 Year old furnace with two taico zones use to have 2 old stile thermostat that I replaced them around 5 years ago with the nest learning thermostat They worked ok till now the battery starts to die and not get charged Just two wires coming from the aqustat R8182 To the 24 v 60 w transfer to the thermostat red and white wires I replaced the batteries not working ...I recently installed two nest thermostats. One in mid May, the other in mid June. Have been working fine. Wires connected were Y,G,Rc for cooling and W,Rh for heat. No "C" wire. My heating is separate unit from AC (5 zone gas boiler) Yesterday, both of my Nest units disconnected from the internet to save battery and ultimately lost power.Learn the possible causes and solutions for the Nest Thermostat error E74, which indicates no power to the RH wire. Check your RH wire connection, HVAC float switch, fuse, relay, and contactor, or charge the thermostat with USB.R can be thought of as the "hot" wire while W acts as the "neutral" wire when the thermostat is calling for heat. Since it's just two wires completing a simple circuit, most thermostat don't care which terminals the "hot" and "neutral" wires are going to. However, the Nest is trying to specifically detect 24 V AC on the R wire and might be more ...November 19, 2022. If your Nest thermostat gives you an “E74” error code, it is notifying you that no power to the Rh wire is detected. When that happens, your first reaction might be …Nest Learning Installation Configuration Manual Pdf Manualslib. Nest 3rd gen learning thermostat chmod 644 google smart wifi black t3018us best generation and c plan system diynot forums copper t3021us 2 ways to fix no power rh wire diy home hub install your help reportedly working on cheaper for under 200 macrumors demystifying wiring colors ...November 19, 2022. If your Nest thermostat gives you an “E74” error code, it is notifying you that no power to the Rh wire is detected. When that happens, your first reaction might be …Hi Nesters! I'm getting "Power out error: E74 No power to Rh wire" with my Nest Learning Thermostat 3rd gen. When it is in Heating Mode it blows a hot air for 5-6 minutes and then stops for 1-2 minutes and then turns back on again.Nest uses Rc and Rh interchangeably, and has an internal jumper if needed. It only gets complicated if there is a completely separate cooling system that needs power differently than expected. Running a single cable from the Rh terminal on the nest back to the R terminal on the furnace should be sufficient. If you now have a verifiably unused ...Business, Economics, and Finance. GameStop Moderna Pfizer Johnson & Johnson AstraZeneca Walgreens Best Buy Novavax SpaceX Tesla. CryptoJust wanted to give an update. Apparently this furnace was not installed with a common wire. Which meant my nest thermostat was never getting power, just running off battery. Apparently the battery started dying causing my issues. Repair guy rerouted a wire and everything works. $50 bucks.To check the wiring of your thermostat, follow the below mentioned steps. STEP 1 - Turn OFF all the breakers to which your HVAC system is connected. Disconnect your HVAC system to continue the process. STEP 2 - Remove the face plate of your thermostat to have a clear look at the wires. STEP 3 - Now you have to disconnect the RC wire and ...I believe that thermostat is a simple Rh and W connection. The problem you may hit is the lack of a C wire to keep the thermostat charged. Reply replyFrom https://www.justanswer.com/ythiJustAnswer Customer: I'm getting the nest.com/e24 error ( no power to Rh wire detected ).JustAnswer Customer: But with my...It supplies the main power to all the equipment, enabling the thermostat to function. However, some thermostats may be absent, especially in the ones that get the power from the already present wires. The main difference between them and Rh and Rc wire is that it supplies power to the thermostat while the Rc and Rh wire supply to the …( 1) How To Fix Nest No Power To Rh Wire? If your Nest thermostat isn’t receiving any power through the RH wire, then you need to take a few steps to get it working properly …First: note the small diameter wires in the device. Second: in the upper left corner of the wall plate we see labeling that indicates 1A/24VAC. Great! This heating system will accept a Nest learning thermostat. You might also notice that only two wires, a red and a white wire were in use at the old thermostat.When I connect the C wire the nest thermostat doesn't let me go past screens it just says no power found on C wire connection. ... Rc to Rh jumper in old thermostat. new install shown. The HVAC dudes cut a wire short (shown in pic 2) and it's not in use. please help.To fix an E74 error or no power to the Rh wire error on your Nest thermostat, check for loose connections and fix them. If that does not work, clean out the drain pipes and check if the condensate pump associated with your HVAC is clogged. Check Your Rh Wire Connection To Your Nest Thermostat.First: note the small diameter wires in the device. Second: in the upper left corner of the wall plate we see labeling that indicates 1A/24VAC. Great! This heating system will accept a Nest learning thermostat. You might also notice that only two wires, a red and a white wire were in use at the old thermostat.Learn the possible causes and solutions for the Nest Thermostat error E74, which indicates no power to the RH wire. Check your RH wire connection, HVAC float switch, fuse, relay, …Wire a fuel gauge by first disconnecting the old dysfunctional unit to replace it with a new one. Obtain 12-volt power from the fuse box using a standard wire, and connect it to th...Right now, my Nest Learning Thermostat Gen3 works fine without the C wire. However, I can clearly see what I believe to be a C wire wrapped around the conduit line. So I unwrap it, I strip it, and I get 24v from the black (C wire) to any other wires.I check 24v from Red (Rc/Rh) to any other wire. However, from Red (Rc/Rh) to Black (C), I get 0 ...Nest thermostat says that there is no power going to the RH wire. When testing the system, fan will kick on but heat will not. This is a heat only system: gas furnace with no a/c. Everything works with our old battery-powered Honeywell thermostat which only had the R, W, & G wires plugged in.Google Nest Notification To get the most out of Google Home, choose your Help Center: U.S. Help Center, U.K. Help Center, Canada Help Center, Australia Help Center .Bit of Nest history. Nest often has a sub base issue. Usually the issue is contained to the cooling side. Rh is power input for the heating side. So that wouldn't be my first guess. …This video shows how I fixed an error with my Nest thermostat. The error is E74 - No power to Rh wire detected. Learn more at nest.com/e74. In my case this...How do you know that selling stocks in order build a safer portfolio is the right call? Here's how to protect your retirement nest egg. By clicking "TRY IT", I agree to receive new...NEST thermostat. "WARNING REPORT. No power to the Rc wire detected." ERROR MESSAGE. Troubleshooting Nest thermostat Rc (red) power wire issue and finding so...The R wire is the power wire for your heating and cooling system. If you only have one R wire (no Rh or Rc), you can connect your R wire to either Rc or Rh on the Nest thermostat. Note: Don't connect any Jumper wires to the Nest thermostat. Rh: If you don't have an Rc wire, the Rh wire is the power wire for both your heating and cooling systems.RH Wire. If the cooling thermostat uses a single transformer to power both the heating and cooling systems, the wire from the transformer is known as the RC wire since it connects directly to the RC terminal. The RH wire stands for "red heating," which means this is the wire you'll need to activate your air conditioner's heating system.The power on the Rh is greyed out (picture 1). I'm getting: "Power wire Rh detected. No connection to equipment." (Picture 2) It's getting power because you can see lin: 200 mA (c) (Picture 3) This is how things are hooked up (Picture 4): Y: Y1 G: G W: W1 R: Rh C wire adapter (two wires come from this): Rc and CInstalling a wet switch flood detector is an essential step in protecting your property from potential water damage. These devices are designed to detect the presence of water and ...2. Make sure the power is off. Before connecting the wiring, make sure the power to the heating and cooling system is off. This will prevent any potential damage and ensure a safe installation. 3. Check the Nest app. Once the wiring is connected, use the Nest app to confirm it is working properly.Today getting E79 no power to common (C) wire. Multimeter shows 24V between C and RH . ... Go to wiring config in the app and remove C wire. (no need to physically touch thermostat) ... and something like that. I saw someone show the Nest wiring diagram on this forum.Nest thermostat says that there is no power going to the RH wire. When testing the system, fan will kick on but heat will not. This is a heat only system: gas furnace with no a/c. Everything works with our old battery-powered Honeywell thermostat which only had the R, W, & G wires plugged in.My Nest Thermostat said "No power to RH wire detected" I have tried turning circuit breaker on and off No luck The nest thermostat has gone all black now, like it is not on. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? FI don't know. Contractor's Assistant: Do you plan on doing the work yourself?If you’re looking at footage from your Nest Cam and the quality seems a bit lower than normal: it’s not your eyes. In an email to users, Google says it is temporarily lowering the ...Nest E74 no power to Rh wire . We've been having problems with the AC for the past week, and we have no idea why. Disclaimer: I have no knowledge of anything HVAC-related so pardon me if I am unclear. It's also a long sequence of events so please be patient with me.Heater blowing but cold air no heat. Diagnose bad sensors as possible cause. THIS VIDEO IS INTENDED FOR IMFORMATION ONLY AND METHODS ARE NOT PROMOTED OR SUGG...In a circuit, the main load wire — the live power wire between the switch and power source — is typically black, and the secondary load wire is usually red. Wire colors can vary be...Check your R-wire. The next step is checking your R-wire to see it’s frayed. To do this, you have to turn off the power at the breaker. Now, remove the R-wire and straighten it. Finally, insert the wire back to the R connector. If the button stays pressed down even after you let go, the issue should be fixed.This video shows how I fixed an error with my Nest thermostat. The error is E74 - No power to Rh wire detected. Learn more at nest.com/e74. In my case this...Just wanted to give an update. Apparently this furnace was not installed with a common wire. Which meant my nest thermostat was never getting power, just running off battery. Apparently the battery started dying causing my issues. Repair guy rerouted a wire and everything works. $50 bucks.If your Nest thermostat isn't getting power from the Rh wire, there are a few things you can try to fix the issue. First, check to make sure that the wire is properly connected to the Nest base and that the Nest is receiving power from the furnace or other power source. If the problem persists, you may need to replace the Rh wire.The Nest smart thermostat from Google is one of the best in the business, no questions asked. From its elegant form to its deep and seamless functionality, it’s an amazing addition to a smart home network, one that will keep you comfortable and save you a few bucks on your energy bills in the process.… Read More2 Ways To Fix Your Nest Smart Thermostat When No Power Is Reaching The RH Wire ...KEY INSIGHTS Understanding the common issues associated with "nest no power to rh wire": The "nest no power to rh wire" problem typically indicates a disruption in the power supply between the thermostat and the furnace, causing malfunctioning of the heating system. Steps to diagnose and resolve the problem: Proper diagnosis involves checking wiring connections,Remove the thermostat display from the base to expose the wires that are attached to it. Turn the thermostat to heat only and disconnect the Rc wire while leaving the other wires connected. The next step is to remove the Rc wire and look at it. A minimum of one millimeter of exposed copper must be present, with no bends. Check the furnace status LED when the R alert is happening. Furnace could be ove
With the advancement of smart technology and software, smart homes are becoming extremely popular.Whether you want to go all out with a smart home or simply include one or two pieces of smart technology, a Nest thermostat is a great place to start.While they offer many advantages over other thermostats, Nest thermostats still have their fair share of problems.Since the C-wire is the preferred power source for Nest, a loose C-wire can cause the charging process to fail. If you tightened the C-wire during the above steps, give the system some time to charge before proceeding with your troubleshooting. ... Nest Thermostat No Power to RH Wire. When there is no power to your Nest's Rh wire, it will ...Welcome to the Ender 3 community, a specialized subreddit for all users of the Ender 3 3D printer. Here, enthusiasts, hobbyists, and professionals gather to discuss, troubleshoot, and explore everything related to 3D printing with the Ender 3.2. Make sure the power is off. Before connecting the wiring, make sure the power to the heating and cooling system is off. This will prevent any potential damage and ensure a safe installation. 3. Check the Nest app. Once the wiring is connected, use the Nest app to confirm it is working properly.There are numerous ways to fix the connection of your Nest Thermostat. Follow these steps to correct the connection problem: 1. Test the cables. If the cables of your Nest Thermostat are not attached properly. The power to the R Wire is not proper. You can check the cables of your Nest Thermostat by following these steps: Remove all the wires ...Checked connection of Rh wire on nest and it is connected well (I'm guessing if it is not, the furnace wouldn't even start) Used the old conventional thermostat and confirmed no power cycling issue with the furnaceR can be thought of as the "hot" wire while W acts as the "neutral" wire when the thermostat is calling for heat. Since it's just two wires completing a simple circuit, most thermostat don't care which terminals the "hot" and "neutral" wires are going to. However, the Nest is trying to specifically detect 24 V AC on the R wire and might be more ...Mar 20, 2023 · Re-insert the wires in case they are not properly inserted. Push the wire as far as it will go by pressing down the connector button. If the connector button remains in its position when you let it go, this means that the wire has been properly inserted. The wire ends may need to be stripped.Learn six ways to troubleshoot the Nest error e74, which indicates that the RH wire is not receiving sufficient power. Check the wire connection, the HVAC float switch, the fuse, the relay, the thermostat battery, and the drain lines.The Nest smart thermostat from Google is one of the best in the business, no questions asked. From its elegant form to its deep and seamless functionality, it's an amazing addition to a smart home network, one that will keep you comfortable and save you a few bucks on your energy bills in the process.… Read More2 Ways To Fix Your Nest Smart Thermostat When No Power Is Reaching The RH Wire ...You can try moving wire from Rh to Rc. Verify that R and W did not get swapped going to furnace. Some systems have multiple transformers so common wire needs to go to transformer that R goes to.68K subscribers in the Nest community. Discussion on Google Nest products, including installation and configuration. ... E74 No power to Rh wire . ... Try moving the red wire to Rc instead of Rh to see if it makes a difference with/without C and Y1. Also take a picture at the furnace to show what are connected there.No heat call in New York Arrived to find Nest thermostat reading NO POWER TO RH WIRE detected. Found failed transformer at air handler. Replaced transfo...Right now, my Nest Learning Thermostat Gen3 works fine without the C wire. However, I can clearly see what I believe to be a C wire wrapped around the conduit line. So I unwrap it, I strip it, and I get 24v from the black (C wire) to any other wires.I check 24v from Red (Rc/Rh) to any other wire. However, from Red (Rc/Rh) to Black (C), I get 0 ...The Nest smart thermostat from Google is one of the best in the business, no questions asked. From its elegant form to its deep and seamless functionality, it’s an amazing addition to a smart home network, one that will keep you comfortable and save you a few bucks on your energy bills in the process.… Read More2 Ways To Fix Your Nest Smart Thermostat When No Power Is Reaching The RH Wire ...Mud daubers build nests on stucco walls and corners around your house, which can be irritating and make your exterior look unpleasant. Removing mud dauber Expert Advice On Improvin...RH Wire. If the cooling thermostat uses a single transformer to power both the heating and cooling systems, the wire from the transformer is known as the RC wire since it connects directly to the RC terminal. The RH wire stands for “red heating,” which means this is the wire you’ll need to activate your air conditioner’s heating system.Nest Thermostat No Power to RH Wire. If your Nest thermostat does not detect power to Rh wire, or it can’t detect the wires in your thermostat, there could be an issue with your system power or the thermostat wires. ... E4, E24 and E74- No power to Rh wire detected. E5, E25, E75, E155 and E255- No heating or cooling detected. W1 or …Have a Nest Thermostat (3rd Gen) and in my previous apartment two wire heat-only system (W and Rh wires), in order to add the C wire I was using a 24V external transformer (hooked up to C and Rc, since Rc was not populated) and everything worked beautifully for years.Power Issues with new C wires I've used 3 nests, 2 Es (bedroom and kitchen) and 1 3rd gen learning (living room), for 2 years now. At the start of this winter season, they started constantly losing power due to no power in Rh wire, so I had an electrician install a C wire for all of them.Bit of Nest history. Nest often has a sub base issue. Usually the issue is contained to the cooling side. Rh is power input for the heating side. So that wouldn't be my first guess. …When I plug in C wire to Nest Learning Thermostat, I lose power from Rh wire. I've had a problem for a while now where my nest thermostat (learning model 3) isn't charging itself on the wall. I have to periodically remove it and plug it in via USB to charge. This is not a viable solution now that we're dealing with summer weather.No rh wire detected. So I am trying to plug in the nest generation 3 and I have some problems. It says there is an E74 no power to Rh wire. The wires I had were white, yellow, green orange, red and cyan. I plugged them all correctly into the unit, and nothino. Any advice?Make sure they are all turned off. Remove the display from the base to see all the wires attached to your thermostat. Change the thermostat to the heat-only mode by disconnecting the Rc wire while leaving the other cables connected. Check the Rc wire after you pull it out of the circuit.The Nest smart thermostat from Google is one of the best in the business, no questions asked. From its elegant form to its deep and seamless functionality, it’s an amazing addition to a smart home network, one that will keep you comfortable and save you a few bucks on your energy bills in the process.… Read More2 Ways To Fix Your Nest Smart Thermostat When No Power Is Reaching The RH Wire ...If you are getting an E73 / 74 error message on your Nest thermostat, which is code for RC / RH wire not detected. Try this fix. It actually works for most...First, check to make sure that the RC wire is properly connected to the Nest base and that the other end is plugged into a wall outlet. If it is, then unplug the Nest base and plug it back in. This will sometimes reset the connection and restore power to the RC wire. If this doesn't work, then you'll need to check the wiring itself.Is an Rc wire the same as a C wire? No. In the case of only one R cable, the Rc wire powers the heating and cooling system. If you have an Rh and an Rc wire, the Rc wire powers the air conditioner. The C wire provides power to the thermostat.Nest maintains that you don’t need a C wire for the thermostat to run. This is true.I have power to RH, the W and the C and the G are connected, voltmeter confirms there is 24 volts between RH & C, RH & W, RH & G, but still getting E24 , could it be a bad nest? I gave it plenty of ti …The R wire is the power wire for your heating and cooling system. If you only have one R wire (no Rh or Rc), you can connect your R wire to either Rc or Rh on the Nest thermostat. Note: Don't connect any Jumper wires to the Nest thermostat. Rh: If you don’t have an Rc wire, the Rh wire is the power wire for both your heating and cooling systems.Saying Rh wire had no power. Today the nest is completely off. Went in attic to check furnace and LED is off. Breaker is fine and outlet working where furnace is connected to. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?A flashing red light. A low battery message on the screen. A blank screen. A home symbol on the screen. Your Nest should recharge itself from your HVAC system wiring. If your …In order to avoid freezing in the winters, a thermostat can be bought to adjust the temperature of your house so that the inside stays warm. The added bonus of having a Nest Thermostat is that it comes with smart control features that helps you operate it through your phone. However as we know for most smart devices, even the Nest …My Nest thermostat not working message e4 - No power to Rh. The thermostat has been working for years. I believe my heat and cooling is 1 stage. But two sets of 4 wires as follows: 2 red into Rh, two Yellow into V1, 1 black into W1 and 2 green into G. I have a volt meter and voltage is coming from both red wires. Right now, my Nest Learning Thermostat Gen3 works fine without the C wire. However, I can clearly see what I believ