I had that issue and could not get the system to turn on. Check the Rc wire after you pull it out of the circuit. You could also find the air filter within your furnace; in this case, youll need to shut off the electricity at the breaker first. Now see if theres water in the drip pan. See if you can find your systems air filter, often hidden behind a grate in the wall or ceiling. Navigate to Settings and select Technical Info. Fuse was good, drain pan was good, so we changed the filter. If you were installing the Nest Power Connector and there'san N260 help code, confirm that the cover is closed on your HVAC equipment. If the breaker was tripped, flip it back on and see if power has returned to your Nest. Additionally, here are easy-to-follow, step-by-step installation instructions, with pictures and a list of required supplies. Or the second option is first to recognize the main cause and then fix it accordingly. If they are loose or disconnected, reconnect them and see if that solves the issue. This could also be due to the low voltage in the RC wire. He has been a part of the top 5 ranking websites for the last five years and has received many awards for the writer of the month category. Nest maintains that you dont need a C wire for the thermostat to run. The consent submitted will only be used for data processing originating from this website. This is common as a lot of AC units fail during the summer due to hotter temperatures. These troubleshooting solutions were culled from various sources on the internet, including blogs and message boards. Reinstall the Nest thermostat in the base, then allow a little time for it to restart. This will ultimately result in no power supply to the Nest thermostat, thus causing error e73. Check the air filters for any clogged material, 3. Theyll help you in the best possible way. Rc wire not recognized. Regardless of which one you have, if theres only one, it powers the entire HVAC systemheat as well as air. Nest thermostat has an error message reading NO POWER TO RC WIRE DETECTED. Your shower may be draining slowly if it's clogged with hair. Install a Nest Power Connector if there aren't any spare thermostat wires. A countrys social, lifestyle, culture, and economic [], If you are using a wifi connection, your provider can see your browsing history. 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. A professional can navigate the complicated system to avoid damage. ago. Pull down the switch at the breaker box to cut electricity to the HVAC system. Nest has been delivering technology that makes living easy for years, and thermostats are yet other devices that do it for us. The first place to look is your breaker panel or fuse box. My Nest thermostat indicated that there's no power, showing a problem with the red wire indicated in the photo. link to What is IMAX? Reinsert the wire into the terminal. You may have noticed a lot of power issues associated with your Nest after receiving this E73 message. In some homes, the power for the HVAC system is actually located right next to it. Check the drain tube/ drip pans for any clogged material. I flushed the line and a bunch of crap flowed out. Your thermostat may disconnect from Wi-Fi if its not receiving power, even if the battery level is good. Take a picture of the wire connectors Take a picture of the wires and connectors on. Tell them all the steps you have tried to resolve the problem. The most obvious reason your system isnt receiving power is that the power is off! The drip pan is usually found under the cooling coils, connected by plastic drain tubes. This occurs mainly due to extremely hot temperatures, burnt fuse, low voltage to the Rc wire, and much more. I am having trouble and not related to float switch. Good luck! Once I cleaned out the drain line all is working fine and the Nest Code "E73 wiring report" cleared on my Nest 3rd Gen Learning thermostat, I have the Nest 3rd Gen eLearning and got the e73 error code. Dont be afraid to contact a professional if you have any concerns. The fixes mentioned above are the best troubleshooting steps if your Nest thermostat detects an E73, i.e., no power fault on the RC wire. 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. Connect the wire back to the Nest connector when pressed down. When I turn the heat pump breaker off for a while the error message goes away and AC runs for about 10 mins then the error message is back. The Quick View Menu will appear when you press the thermostat ring. Garrett DS. A blown fuse results in no power to the HVAC system which means no power to the thermostat. To avoid this issue, it might be best to have a professional install your Nest in the first place. It could also be located inside the furnace, in which case, youll have to turn off the breaker before removing it. Reset your circuit breaker to restore electricity. Or, you have the more practical alternative of calling an experienced HVAC technician who will quickly mend your system. All other steps checked! The HVAC system is powered off at the circuit breaker, fuse box, or system switch, or theres a power cut. Always follow the wiring diagram the Nest app gives you during setup to connect your Nest thermostat. Thermostats "No power to Rc wire detected" E73. There is no low voltage. Are you looking for the perfect thermostat temperature so that you're not wasting electricityand money? If you have decided to fix the issue yourself, start by checking your wiring, air filter, drainage tubes, and HVAC fuse to make sure they are all functioning to solve the Nest Thermostats no power to RC wire detected issue. I had to clean out the drain line for the air conditioner. Best regards, An E73 error means theres no power going to your Nests Rc wire. The C wire provides power to the thermostat. Her hobbies include pretending to be Joanna Gaines while updating her home with her husband and performing in local theater productions. Switch on your breaker now to restore electricity to your thermostat. He discovered his passion for DIY projects and home improvement there. If you discover that it has been burned or discolored, it has been damaged and must be replaced. Extreme hot weather and low voltage on the Rc wire are its main causes. In my situation the fuse was corrected inserted in one of the terminals but was not in the other. When the system shuts down, it stops sending power to your thermostat. Its important to note that, while the R wire powers your HVAC unit, Nest is powered by the unit while its running. Next, look for any dirt, dust, or clog but ensure to do so gently. This fixed my problem. The most common reason to receive an E73 message is due to improper or loose wiring. These systems are incompatible with Nest thermostats. To check whether your HVAC system has a clogged filter or not and how to troubleshoot Nest thermostat, follow the steps below: I recommend changing filters once every 90 days to avoid these problems. Locate the drip pan. "WARNING REPORT. Now remove your thermostat display from the base. If you have trouble finding it, refer to your owners manual. In order to give the battery 24/7 power, a C wire is required. Seat the wire fully into the right connector. Did you ever hear back on a solution. Once youve done that, go to Power and check for the battery indicator next to it. There is often a safety switch that prevents operation with the cover removed. Do you have any ideas? If all the wires are grey, the system may be powered off or experiencing some other power-related issue. For a few days, I grappled with the same problem, and when I surfed the internet and couldnt find something comprehensive and helpful, I had to call an HVAC technician. Ensure all breakers are turned off if the system has numerous ones. Sometimes we got a small commission if you buy products using our links. Locate the HVAC fuse on the control panel. Some help codes can be dismissed, but they may appear again if the problem persists. (If your Nest Thermostat battery is low, check this guide). It works again for a bit and then nothing. If you have an Rh and an Rc wire, the Rc wire powers the air conditioner. In short, if your Nest Thermostat says there is no power to the RC wire, this could be due to: incorrect wiring, a faulty air filter, obstructed drain tubes/drip pans, and an inoperative HVAC fuse. (7 Easy Steps). This can take up to 24 hours. My fix has been wiggle the wire a little at the connector and turn off the AC unit breaker. Inspected the copper wire going in an out of the Fc space on the thermostat. 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". I just kept reconnecting this wire and it has ultimately stopped for now. Sorry TerryL. For your ease, let me tell you this is nothing to worry about as you can easily fix it. Power can't flow if connections are not secure. After all the wires are connected, re-attach your thermostat to its base. The support people are adequately trained to solve customers problems instantly. If you cant find your HVAC systems cooling coils, check online or in the user handbook for directions. 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. If this sounds familiar, Few homeowners rejoice at the sight of snakes in and around their house. 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. Here are the steps to check the HVAC fuse: If none of the above hacks helped you, then feel free to contact the customer support team for their assistance. Turn your breaker back on to bring back the power. Start by turning off the power to your HVAC unit. Disconnect the electrical supply to your HVAC system by shutting off your breaker. Remove the thermostat display from the base to expose the wires that are attached to it. Cut off power to the HVAC system by turning off the breakers. If you have a 24 VAC voltage, your wiring is OK, and the issue is with the AC unit, not the wiring. If it does not operate in an easy manner, you may need to have a technician come and replace the switch. A minimum of one millimeter of exposed copper must be present, with no bends. If yes, then there is surely a clog. Maintaining proper airflow is paramount for your HVAC system to function properly, and a clogged air filter can severely limit the amount of air flowing through the cooling coils, which can, in turn, freeze and shut the system down. However, others like checking the cooling coils and drip tubes are quite complex, and it is recommended that you seek the help of an expert. Important: You must turn the system off before checking the system wires. Locate the cooling coils; you can look for information online or in the users manual of your HVAC system. Hello, I am trying to install a NEST 3rd generation. We are very thankful to you if you use our links! Know more, save more Check your Energy History to see how much energy you use and why. At this time, you can test the voltage of the other wires just in case. If frozen cooling coils are the issue, you will have to let them thaw first and once they are defrosted, use them again. 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. So, if the voltage is adequate, the problem lies behind the AC unit. Max is a computer scientist specializing in home security devices, fire alarm systems, security cameras, and other smart devices. I removed the base and tested the power with a multimeter to be at 27.8V Confused, I contacted Nest support and after checking my wiring, they decided to replace the base. Get an answer from an expert on the Google Home Help Forum. 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