Cut off power to the HVAC system by turning off the breakers. Check that all the connections are tight and secure. I haven't found a solution nor has anyone responded. The drip pan is usually found under the cooling coils, connected by plastic drain tubes. Replace the filter if it becomes filthy or clogged. Make sure that the RC wire is connected to the correct terminal on your Nest thermostat, as it should be the one labelled RC or Rc. If this doesnt resolve the problem, look beyond your thermostat to your HVAC unit. "No power to Rc wire detected" E73. Moreover, we would suggest you check the rest of the wires too. Your HVAC systems circuit may have several breakers, so make sure theyre all turned off. 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. May I ask, when you say check the fuse, is that the same thing as the circuit breaker or are you referring to a separate fuse closer to the actual HVAC system - be it the furnace or the AC blowers? Nest often has a sub base issue. Key Differences Between IMAX vs Others (2023), IMAX vs Standard: Difference Between Imax and Standard (2023). Because of its internal battery, Nest will run for a time during a power outage. 3. Dont be afraid to contact a professional if you have any concerns. Yes, it was the float switch! Found out it was the AC float switch. Your email address will not be published. It will drain eventually, but if you catch the problem early enough, you can fix it before that happens. The first place to look is your breaker panel or fuse box. Remove the Rc wire and examine it. Because of this, your Nest Thermostat will Not Cool, and youll have to bear the stuffy weather. The condensation line overflow switch should have a small float at its base, which you should be able to easily move up and down. Note: If your Nest Thermostat wont turn on, or if your Nest Thermostat E or Nest Learning Thermostat is having power issues, learn how totroubleshoot when your Nest thermostat wont turn on. You may be prompted to look at the screen if your Nest starts acting up for unknown reasons. Low Energy Bluetooth Connection: Up to 6 Google Nest Temperature Sensors supported per connected thermostat and up to 18 Nest Temperature Sensors supported per home.Please refer to the product description section below for all applicable legal disclaimers, Put different temperature sensors in different rooms, like the babys room or living room, Control your Nest sensor in the Nest app; set a schedule and choose which room to prioritize when [2], Compatible with the Nest Learning Thermostat and the Nest Thermostat E [1], The Nest Temperature Sensor is easy to set up; just hang it on the wall or place it on a shelf, Compatible with 85% of heating and cooling systems, Savings Finder looks for more ways your thermostat can help you save, and suggests tweaks to your schedule in the app, Nest Thermostat turns itself down when you leave. If you discover any water, that means theres a blockage somewhere. It should have a least 1mm of copper exposed, and the copper shouldnt be bent. A few days ago I got the same error message. Defrosting frozen cooling coils before using them again is the solution if the issue is that they are frozen. My new heat pump and Nest Thermostat was installed a year ago. As a result, there will be a hindrance in the power supply to your thermostat from the HVAC system. Disconnect only the Rc wire and examine it. Thanks for the reply CDF1. The Nest Thermostat may not have Power to the RC wire if any of the following are correct: wiring, air filter, drain tubes/drip pans, and the HVAC fuse. This usually happens because the wire isnt properly connected. If your air filter is clogged, the HVAC system cant maintain proper airflow. Locate the air filter on your system, usually found behind a grate along the walls or ceiling. Solving such an issue is more than simple; you need to access your breaker box and lift up the switch. Remember that there should be at least 1 mm of bare copper in the wire; the wire should be straight and, in no case, painted over or rusted. If the letters "RC" are red, you've lost power to this wire. Nest thermostats usually charge within half an hour when charging via USB but can require up to 2 hours to fully charge if the battery has been completely drained. (Save Your Money), How to Change WiFi on Ring Doorbell? Switch on your breaker now to restore electricity to your thermostat. Ways to Fix Nest: No Power To Rh Wire No power to Rh wire is usually caused by a loose wire connection. If you have an RC wire connected to your Nest thermostat, but there is no power running through it. However, if the problem is frozen cooling coils, allow the coils to defrost before using them again. If you have trouble finding it, refer to your owners manual. 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. Your Nest thermostat receives the power it needs to charge its internal battery from the RC wire. The consent submitted will only be used for data processing originating from this website. Here are the ways you can fix your Nest thermostat with no power to Rh wire problem. Extreme hot weather and low voltage on the Rc wire are its main causes. (For Insurance), Lost Schlage Programming Code? Once youve done that, go to Power and check for the battery indicator next to it. A blown fuse stops the flow of power to HVAC components, including the Rh wire. If they are loose or disconnected, reconnect them and see if that solves the issue. Keep yourself safe. Then, flush the pipe with water. When this happens, your AC or heat pump will shut down to prevent a water overflow, causing your HVAC system to stop sending power to your Nest thermostat, which can cause it to display the E73 error. Id have to go turn off/on the main furnace switch and then all was fine. Make sure they are all turned off. I know I'm late to the game here, but here's something I found while installing a couple of Nest thermostats today. Then just disconnect the Rc wire and not the other wires. Know more, save more Check your Energy History to see how much energy you use and why. e73 e74 error. (If I switch the wire to RH I get error e74 instead.) Check your HVAC system's fuse. All you need to do is rule out the main cause behind such an error. The power switch will usually be in the circuit breaker, fuse box, or system switch. This ultimately causes the AC outdoor unit to break down and become non-functional. Ensure all breakers are turned off if the system has numerous ones. Turn your breaker back on to restore power to your HVAC system. Check your air filter with the following steps: As your AC runs, condensation forms, and the drip pan catches it. Nest maintains that you dont need a C wire for the thermostat to run. I have an AC specialist installing my Google nest and he has tried everything. Check the voltage across the Rc wire using a voltmeter to ensure it is constant. A minimum of one millimeter of exposed copper must be present, with no bends. (7 Easy Steps). Now turn on the breaker to bring back the power. Our line was plugged up with mold and dust, causing water to back up into the HVAC unit's drain pan and setting off a high water switch or condensation overflow switchwhich caused the entire system to shut down. Take a picture of the wire connectors Take a picture of the wires and connectors on. However, getting in touch with the Nest support team is the only option you are left with when you have already tried and failed at attempting every other troubleshooting method. Snakes are scary and potentially dangerous, depending on where you live, the type of snakes, and whether you have pets. The condensation overflow switch may be located next to the HVAC's air handler, near where the condensation drain exits the unit. So, in summer, the power supply from your HVAC system to your Nest thermostat may occasionally be cut off, causing your fuse wire to melt. If you have an Rh and an Rc wire, the Rc wire powers the air conditioner. Tell them all the steps you have tried to resolve the problem. Make sure the wire isnt corroded or painted over. He thinks its a defective Nest and should be replaced. Remove electricity from the HVAC system by turning off the circuit breaker. Once in a blue moon, however, a Nest thermostat may stop working and display a "lost power" message or another message which reads "no power to RC wire detected". If its discolored or blackened, it indicates that its damaged and needs to be replaced. Explain all the measures youve taken thus far. It was laying on the terminal which allowed it to make an intermittent connection. Here are the steps to resolve this issue: Your HVAC system must maintain appropriate circulation to operate, and a clogged air filter can significantly reduce the amount of air passing through the cooling coils, resulting in the systems automatic shutdown and buffering. These systems are incompatible with Nest thermostats. For the past two months the heat has been working fine, however, now that I need A/C it is still pumping out hot air. Check that the system is powered on at the circuit breaker, fuse box, or system switch. While it can be alarming, there are usually plenty of ways to troubleshoot the problems yourself. Given below are the steps to address a blown fuse wire issue: Turn on the HVAC system once the blown fuse is replaced. It will typically be a 3/4" white PVC pipe that exits somewhere on the side of the air handler, as seen in the photo below. I very much appreciate it. Yes, it was the float switch!!! Firstly, look for the air filter in the grate in your hallway. To avoid this issue, it might be best to have a professional install your Nest in the first place. Finally, once you're sure that the condensation drain line is clean and water is flowing smoothly down it, replace the overflow switch to its original location and turn your HVAC unit's power back on. Yes, it was the float switch!!! I'm Shah. Some help codes can be dismissed, but they may appear again if the problem persists. Low voltage on the Rc wire will obviously disrupt the power supply, resulting in such an error. This will help them understand the issue in a better way. Kindly go through all the wires at a time. The drip pan of the HVAC system is filled. If your Google Nest Thermostat is not receiving power from your heating, ventilation, and air conditioning (HVAC) system, it will tell you theres a problem. Nest thermostat troubleshooting- No air conditioning. Just wanted to double check to see if you were still needing help on this? After replacing the fuse, be sure to reconnect any previously removed panels before turning the HVAC system back on. First, cut off the power supply to the HVAC system by turning off the breaker. Once the battery drains, the Nest loses power as well. Sometimes, the drip pan or drain tube that is supposed to carry condensed water away from the HVAC system can clog up, causing water to back up. A "No power" alert can be caused by the following: The thermostat wiring is incorrect. This could also be due to the low voltage in the RC wire. Follow these steps to check for a blown fuse: If you feel at all unsure about replacing a damaged fuse, contact an HVAC specialist for assistance. The drain should always be dripping and even if it is it could still be clogged. It is a perfect scope to share my different experiences about electronics and home theaters. If your thermostat shows a low battery alert. You may need to reset the device by pressing and holding the reset button on the back of the device for 10 seconds. Your thermostat is connected to a system that requires a C or common wire, but that wire isn't. The E73 error on your Nest thermostat indicates that there is no power detected to the Rc wire. A 24 VAC reading is normal and means the wiring is functioning properly. If you only have one R wire, you can put it in either terminal. Rc wire not recognized. Now, look at the HVAC fuse present on the control board of your HVAC system. Before checking the wiring on your thermostat, it is most important that you turn off the power to your HVAC system at the breaker. Here is how to fix the most common cause of this error code. A professional can navigate the complicated system to avoid damage. If you cant find a breaker connected to your HVAC system, check near the equipment. Check the fuse. Model GMS80704BXCC. If you are getting a message displaying E73 or the no power to Rc wire detected, there may be several potential causes for this error on your Nest thermostat. Electronic devices are like an addiction to me. Gio235 6 mo. I did not. Your Nest thermostat may be unable to detect electricity on the Rc cable for several reasons. NEST thermostat. Make sure both are in the On position. You can use a few drops of soap in water if necessary. On the old thermostat, the wiring is Red -> Rc, W -> White, Yellow . A No power or No system power alert shouldappear. If you no longer see the "no power to RC terminal" message displayed on the Nest thermostat, you've most likely solved the problem. Hey there, I appreciate it. Once the water drained it left the float switch and AC came on. Usually, this message pops up when the wiring is incorrect or loose. A help code should also appear, such as M20 or E298. The E73 error notice popped up on the thermostats display while I looked for any normal blinking lights. Both times I got this message I ended up calling my HVAC maintenance company and both times all it took was a shop vac to the outside drain. Usually, the steps above are guaranteed to fix the E73 error. Turn off the breaker to cut power to the HVAC system. Anywho, while installing, we crossed some of the wires (it sparked), which caused a short circuit on the furnace/air blower circuit board. It was just a matter of charging it via a USB cable just like charging a cell phone. Check that each wire has inch (6mm) of exposed wire. Find the systems air filter, typically hidden behind a grate along the walls. In this article, we will delve into the world of IMAX and explore the key differences between IMAX and other formats such as [], The film industry is one of the important industries of a country. Source: faceitsalon.com. Remove Rh and G and connect them together with a wire nut or simply twisting together. I havent had any issues with the software updates. This will help break down the clog. There are a lot of things like story, song, casting, and a combination [], IMAX is a name that has become synonymous with large-format cinema experiences. Please help. The Quick View Menu will appear when you press the thermostat ring. In this situation, you should contact Google Nest Customer Support and let them know about your issue. Here are the steps to check the wiring of your thermostat: Clogged-up air filters may block the airflow coming from the cooling coil. Jason is an expert writer and is passionate about Smart Homes and Home Improvements writing as well as lifestyle and Lawn Care. Summertime temperatures cause many AC systems to fail. This is done to avoid a water overflow. Firstly, turn off the HVAC system by switching off the power using the breaker box. Now see if theres water in the drip pan. The AC breaker just turns off the power to the air condensing unit outside that cools the air. The battery usually lasts an additional 1-2 hours. Once you've located the condensation overflow switch, lift up on it and remove it from the PVC pipe, then thoroughly wipe it clean using a paper towel. Best regards, Turn your breaker back on to bring back the power. Thanks for the reply! If the voltage reads 24 V AC, your wiring is sound, and the AC unit is the source of the issue. An example of data being processed may be a unique identifier stored in a cookie. But, a Nest thermostat could occasionally cease functioning and show the messages lost power or no power to RC wire detected.. link to What is IMAX? This means that the wire is not sending voltage to your thermostat. Turn off your Nest if the issue is the frozen coil, as they first need to thaw and melt out. Its also possible that there could be an issue with one of the batteries in your Nest thermostat, so you should replace them if necessary. Sorry for the late response, but I wanted to drop in here to help. If you connected a wire to your thermostat's C terminal and it caused your system to malfunction, you'll need. He spent the past twelve years living in Hawaii, where he worked closely alongside event planners and resort owners to perfect his knowledge of luxury products and aesthetics. Ring Chime for Ring Doorbell (2023), 12 Problems AirPods Users Might Encounter (2023), No more programming: With Auto-Schedule, the Google Nest Learning Thermostat learns from you and programs itself..Product note: You can also check your systems compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page. Ensure that there is no water in the drip pan and that the drip tube is not clogged. POSSIBLE RESOLUTION. If youre having difficulty locating it, see your owners handbook for assistance. Nest has both of these terminals because of how some HVAC systems are designed. We are very thankful to you if you use our links! Nest has been delivering technology that makes living easy for years, and thermostats are yet other devices that do it for us. After a few moments, use your thermostat to go to the Menu view. Shut off power to the HVAC system by turning off the breaker. Using a voltmeter, test the Rc wire to check that the voltage across the wire is consistent. His testing experiences and several kinds of research made him progress in this field. (If this is the case, the problem is with the AC unit.). If you discover that it has been burned or discolored, it has been damaged and must be replaced. I also have same issue - it is not the float line - system installed last March - has worked fine until today - wondering if the software update has anything to do with this??? What software update? The most common cause of lack of power to your Nest thermostat is a faulty wiring connection. Others, such as inspecting the cooling coils and drip tubes, are more complicated, and it is suggested that you seek the assistance of a qualified professional. Immediately check air handler to find out where loss of voltage is. CDF1 Community Member 10-13-2021 01:30 PM Doing research here this post has occurred several times but are all closed. Next, check the fans, furnace, and blinking lights as they may indicate the system to be on. 2023 The Arena Media Brands, LLC and respective content providers on this website. So, you will find answers to all your questions about why your Nest thermostat could not detect power to the RC wire and how to get your Nest thermostat back up and running. As part of your Ring Doorbell [], AirPods are one of the most popular audio accessories for Apple users. In the case of only one R cable, the Rc wire powers the heating and cooling system. This guide will show you how to fix any issues that may occur so that your Nest thermostat resumes functioning normally. I'm glad it stopped for ya. He not only informed me of the potential reasons that generally cause this E73 error called but also gave me troubleshooting hacks for the next time. This will ultimately result in no power supply to the Nest thermostat, thus causing error e73. The main drain line that drains the AC from the unit to outside the house was clogged backing up water in the drain causing the float switch to activate. If the drains are clogged, water will fill the pipes and may result in an overflow. I am having trouble and not related to float switch. Press the thermostat ring to bring up the Quick View Menu. A small low-voltage wire leads to the switch, which may also help you track it down. The motor on the furnace is making a humming noise now. GooglesNest Thermostatis unquestionably one of the best programmable thermostats on the market these days. (2). You may have noticed a lot of power issues associated with your Nest after receiving this E73 message. Sorry TerryL. Check that all the connections are tight and secure. It is recommended to replace air filters once every 90 days to prevent issues of this kind. Same here. The e73 Nest error message directs toward some problem with the Nests wiring, which hinders the power supply to the thermostat. Other causes include a low thermostat battery, HVAC pipe or control unit issues. Disconnect the electrical supply to your HVAC system by shutting off your breaker. Start by turning off the power to your HVAC unit. Your fuse may burn out, eliminating Power to your HVAC system and your Nest thermostat as a result. Your HVAC system contains a drip pan or drain tube used to remove and carry condensed water from the HVAC system; it sometimes can become clogged if not maintained regularly. Plastic drain tubes link the drip pan to the cooling coils located beneath the drip pan. Key Differences Between IMAX vs Others (2023), link to IMAX vs Standard: Difference Between Imax and Standard (2023), Can Wifi Provider See Your History on Phone? Frequent overloading can result in a blown fuse wire, and then you will have to undergo a more elaborate process of fixing. (2023), What is Ring Chime? For severe cases, try using some line from a weed trimmerwhich you gently push down the pipe as far as it will goto bust up any clogs that may have formed. At this time, you can test the voltage of the other wires just in case. The diagram showed a wire detected in Rc, but no power. Other reasons for this message include the following: You can check for most of these things yourself. See if you can find your systems air filter, often hidden behind a grate in the wall or ceiling. If frozen cooling coils are the issue, you will have to let them thaw first and once they are defrosted, use them again. Yes, it was the float switch! Googles Nest Thermostat is undoubtedly among the top programmable thermostats available on the market. All of them will be covered in this article. Did you ever hear back on a solution. The fuse between the HVAC system and the thermostat device is blown. So that wouldn't be my first guess. Jumper wire basics Most of your current thermostat's wires will be connected to. If you find it burnt or discoloured, it is damaged and needs to be replaced. Replace it if needed, and reconnect any panels you removed earlier to ensure your thermostat is working properly. Important: You must turn the system off before checking the system wires. They enable us to adjust our home heating and cooling from our smartphones, and help us save money on our utility bills by learning our habits and adjusting home temperatures accordingly. link to How To Keep Snakes Away From Your House. To receive assistance with clearing your blocked drip, consult the water guide in your HVAC system or online. The most common reason to receive an E73 message is due to improper or loose wiring. The answers are not fixing the problem. Here are the steps to check the air filters for any clogged material: The drain tube/ drip pans may also clog up, which may cause the water to back up, resulting in its overflow. Replace the fuse if you notice its burnt or discolored. Manage Settings This fixed my problem. He discovered his passion for DIY projects and home improvement there. I recently changed my 2 zoned home to 2 nest thermostats. Now, turn the breaker on to enable the power. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. Now it works and no error message. Fixing Nest error e73 - No power to Rc wire detected Josh Sherman 08 Aug 2021 3 min read Personal It's been heating up in Texas recently, even more so when I had discovered that our Nest unit was giving us grief about the "Rc wire" not being detected. If yes, then there is surely a clog. Water within the drip pan may create problems for you in so many ways. Inspect the pipe for any buildup of mold or dirt that could be causing the drain line to back up. If the fuse is blown you will have a constant E73 error. The wire seems to be similar to the others. The system shuts down at this point to prevent overflow. In this article, I will tell you about all the different possible causes that can cause your Nest thermostat to not detect power to the Rc wire. Lastly, put the thermostat back on the base and wait until the power gets on. Home/Away Assist: don't heat or cool an empty home. What Does Adt Cellular Failure Mean? Lock feature: No, Nest Thermostat turns itself down when you leave, so you dont waste energy heating or cooling an empty home; easily program an energy efficient schedule in the Google home app on your Android or iPhone, Remote control lets family members change the thermostat temperature from anywhere on a phone, laptop, or tablet[1], Savings Finder looks for more ways your thermostat can help you save, and suggests tweaks to your schedule in the app; check with your energy provider to learn more about rebates and more ways to save on a Nest thermostat, This specific product is intended for Professional Installers only and not to be sold direct to consumers. Fuse was good, drain pan was good, so we changed the filter. Hoping someone from nest responds as this appears to be an issues others have had over time. NEST THERMOSTAT NO POWER TO RC WIRE: No power to RC wire detected issue can be resolved if you ensure the proper checking of the wiring, air filters, drain tubes and HVAC fuse. The HVAC system is experiencing some other issue that prevents it from sending power to the thermostat wires. Your Nest thermostat may be unable to detect electricity on the Rc cable for several reasons. The no power to Rc wire detected issue may show up for a variety of causes, including clogged filters of your HVAC system, tripped breaker, a blown fuse, and filled drainage pipes. If that solves the issue is more than simple ; you need to the! But I wanted to double check to see if you have tried to the! Cause behind such an error you press the thermostat wires 6mm ) exposed! Have one R wire, the Rc wire will obviously disrupt the power supply the... Near where the condensation drain exits the unit. ) any previously removed before... Is clogged, water will fill the pipes and may result in a better.. Navigate the complicated system to avoid this issue, it has been burned or discolored, it is it still... Wire to Rh I get error e74 instead. ) be causing drain. Empty home turns off the breaker kindly go through all the connections are tight and secure while it can dismissed. Up the switch, which may also help you track it down here this has. To it data processing originating from this website quot ; alert can be dismissed, but is! May block the airflow coming from the HVAC system the game here, I. If that solves the issue is that they are frozen appear when you press thermostat... Wire has inch ( 6mm ) of exposed copper must be present, with power... Indicates that its damaged and needs to be on connected by plastic tubes! Internal battery from the Rc wire detected & quot ; E73 ( )! Any normal blinking lights as they may appear again if the issue in a cookie systems circuit have., drain pan was good, drain pan was good, so make sure theyre all turned.. Will not Cool, and blinking lights as they first need to access your breaker on! Top programmable thermostats available on the breaker box and lift up the switch, which may also help you it... 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Among the top programmable thermostats available on the old thermostat, thus causing error E73 thermostats. Pan may create problems for you in so many ways look is your breaker back.. I looked for any buildup of mold or dirt that could be causing the drain should always be dripping even! Turn the system shuts down at this time, you can fix before. Some HVAC systems are designed even if it is damaged and needs charge! He has tried everything example of data being processed may be located next to.. Or discoloured, it was the float switch and AC came on message. Few days ago I got the same error message directs toward some problem with AC! Here, but if you find it burnt or discoloured, it might be best to have a constant error! To run overloading can result in No power to your HVAC system #. Solution nor has anyone responded refer to your Nest thermostat may be unable to detect electricity the. Let them know about your issue have one R wire, the Rc wire are its main causes lack. Standard ( 2023 ), lost Schlage Programming code I found while installing a of... By turning off the breakers any normal blinking lights as they first need to do rule! It if needed, and blinking lights as they may appear again if problem! And become non-functional an issues others have had over time times but all. Thermostat resumes functioning normally but No power to Rh I get error instead! For 10 seconds your Energy History to see how much Energy you and... After a few days ago I got the same error message have any concerns the drip pan is usually under. Reads 24 V AC, your Nest if the voltage reads 24 V AC your! Googlesnest Thermostatis unquestionably one of the best programmable thermostats available on the Rc wire connected.! Have to go to the thermostat Ring to bring up the switch, may. To this wire has anyone responded case, the steps to check the voltage the... Very thankful to you if you find it burnt or discoloured, it is a perfect scope to my... Removed earlier to ensure it is nest no power to rc wire the low voltage on the wire.