Lastly, turn on the power at the breaker box. You could have either an Rc or an Rh wire. 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. The support people are adequately trained to solve customers problems instantly. Therefore, I contacted a local HVAC technician and did my research to find out the reasons and solutions to this problem. Use your owners manual as a guide if you need help finding it. Just wanted to double check to see if you were still needing help on this? Change the thermostat to the heat-only mode by disconnecting the Rc wire while leaving the other cables connected. Turn the power to your system back on and check to see if your thermostat is working. Firstly, turn off the HVAC system by switching off the power using the breaker box. To ensure that other Nest users have information at their fingertips when they face such an issue, here I am listing down all of it. The most common of which is in the form of Nest error e73. If the letters "RC" are red, you've lost power to this wire. I got an error mesh saying no power to RC line. There are a few things you may notice on your thermostat: A No power alert can be caused by the following: Below are some steps to troubleshoot a No power alert on your thermostat: This article only applies to the Nest Thermostat. The most common reason to receive an E73 message is due to improper or loose wiring. Other reasons for this message include the following: Tripped breaker Clogged air filter Excess water build-up in the drip pan A blown fuse on the furnace You can check for most of these things yourself. The Nest thermostat is extremely easy to set up and use, and most of the errors that may pop up are easily fixed. In this case, contact Google Nest Customer Support and inform them of your problem. How Do I Stop Pictures From Tilting On My Wall? As Amazon Associates, we earn from qualifying purchases. If its discolored or blackened, it indicates that its damaged and needs to be replaced. To fix this error, check your wiring, air filter, drain tubes/drip pans, and HVAC fuse and ensure that all of them are working correctly. The above solutions are usually enough to fix the E73 error message. This fixed my problem. In terms of setup and usage, the Nest thermostat couldnt be easier. The float switch is in your unit and when theres back up from clogging of water,floods up of water it Causes the floater to rise and cut off the power. The burnt fuse may also interfere with your systems power supply, resulting in the sudden abrupt shutdown of your Nest. What is IMAX? Locate the air filter on your system. Usually, the steps above are guaranteed to fix the E73 error. Its easy to be intimidated by an E73 error since it shuts down your Nest thermostat and prevents you from using it until the problem is resolved. A "No power" alert can be caused by the following: The thermostat wiring is incorrect. Also, look at the linking lights, which may indicate that your system is still on. 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. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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. Check the fuse. Because of this, your Nest Thermostat will Not Cool, and youll have to bear the stuffy weather. Find the cooling coils by consulting your HVAC systems user manual or the internet for directions. Locate the HVAC fuse on the control board for the HVAC system. This guide will show you how to fix any issues that may occur so that your Nest thermostat resumes functioning normally. If the cooler coils are frozen, allow them to thaw completely before using the AC again. Check the air filters for any clogged material, 3. If it gets clogged the system will show this error. Locate the air filter on your system, usually found behind a grate along the walls or ceiling. Defrosting frozen cooling coils before using them again is the solution if the issue is that they are frozen. 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. They will diagnose the problem with your gadget at the earliest and guide you with the right solutions. Some HVAC systems, known as dual transfer systems, use separate power for heating and cooling. Step 3. The wire should be inserted back into the Nest connection while maintaining pressure on the connector button. Sure enough - that fixed it. 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. On the HVAC system control board, locate the HVAC fuse. 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. To see whether your air filter needs to be replaced, do the following: To avoid problems like these, change your air filters about once every 90 days. If you are unfamiliar with how to do this, consult an electrician. In order to give the battery 24/7 power, a C wire is required. If your system has multiple breakers, ensure to turn them all off. If the breaker was tripped, flip it back on and see if power has returned to your Nest. 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. Check what your thermostat's wire labels mean. Note that all the causes for such an issue are reversible and can easily be fixed. Your HVAC systems circuit may have several breakers, so make sure theyre all turned off. Theyll help you in the best possible way. E help codes cant be dismissed, so they wont disappear until the issue is fixed. To be thorough, you can perform the same checks on the other wires as well. Here are the steps to check the drain tube/drip pans for clogged material: If you find a clog in your drain tube/ drip pan, search on Google or take the help of the HVAC help guide to get rid of it. Loose wires other than the Rh wire can also cause that power doesn't go to the Rh wire. There are simple troubleshooting methods that you can try yourself, like checking the breaker box and ensuring that the AC breaker is on. Your email address will not be published. Turned the circuit breakers on and off to the heating and cooling units, 2. We discovered that our Lennox HVAC's air handler unit, which is located in our attic, has a condensation drain line that leads to the outside of the home. No a/c, just a goodman gas furnace blowing into house thru vents. 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. Years ago, I started my job at an audio/video installation co. Then I realized that I have a passion for home theaters. Additionally, keep an eye out for any evidence of water damage, such as rust, which might point to previous water contact. We are very thankful to you if you use our links! Investing in a new Google Nest thermostat and facing no power issues is surely terrifying. The next step is to remove the Rc wire and look at it. I understand that these issues can be confusing but I definitely wanted to stop by and see how I could help. Google Nest Temperature Sensor 3 Count Pack - Nest Thermostat Sensor - Nest Sensor That Works with Google Nest Thermostat - Smart Thermostat for Home - Programmable WiFi Thermostat - Compatible with Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow (Renewed), Nest (T3007ES) Learning Thermostat 3rd Gen, Stainless Steel with Deco Gear 2 Pack WiFi Smart Plug, Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Sand (Renewed), IMAX is a name that has become synonymous with large-format cinema experiences. (Save Your Money), How to Change WiFi on Ring Doorbell? 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. Explain all the measures youve taken thus far. 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. Your email address will not be published. Its partially correct to assume, then, that the Rc wire gives power to the thermostat. Step 2. Yes, it was the float switch! It could be a bit more complicated than that, though. Lastly, put the thermostat back on the base and wait until the power gets on. If you only have one R wire, you can put it in either terminal. Usually the issue is contained to the cooling side. Now inspect the fuse carefully. Remove the display from the base to see all the wires attached to your thermostat. Have you found and solutions? Replace the Nest back on the wall and wait for it to fully power up. Reinsert the wire into the terminal. If you are experiencing a lack of power to your RC wire, the issue could be related to one of several factors such as circuit breaker is tripped, RC is not connected properly, damaged or frayed wire. Another generic reason for such an error may be a simple problem with the wire settings. If you receive an E73 error message on your Nest, it means theres no power to the Rc wire. Your HVAC system will cease providing electricity to your Nest thermostat when this occurs, resulting in the E73 error. Check your HVAC system's fuse. This could also be due to the low voltage in the RC wire. Replace the filter if it becomes filthy or clogged. 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. In case the system has multiple breakers, ensure they are all turned off. The condensation overflow switch may be located next to the HVAC's air handler, near where the condensation drain exits the unit. When the system shuts down, it stops sending power to your thermostat. Her hobbies include pretending to be Joanna Gaines while updating her home with her husband and performing in local theater productions. In the case of only one R cable, the Rc wire powers the heating and cooling system. 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. The drip pan is usually found under the cooling coils, connected by plastic drain tubes. 134,367 views Apr 23, 2018 One possible. Start by turning off the power to your HVAC unit. Given below are the steps to address a blown fuse wire issue: Turn on the HVAC system once the blown fuse is replaced. These systems are incompatible with Nest thermostats. Make sure the connector button is pressed firmly down. Check the Rc wire after you pull it out of the circuit. Look for the Leaf: The Nest Leaf appears when you choose a temperature that saves energy. Anywho, while installing, we crossed some of the wires (it sparked), which caused a short circuit on the furnace/air blower circuit board. Are you looking for the perfect thermostat temperature so that you're not wasting electricityand money? Then, flush the pipe with water. Your shower may be draining slowly if it's clogged with hair. Google Nest Learning Thermostat - Programmable Smart Thermostat for Home - 3rd Generation Nest Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow, Google Nest Learning Thermostat - 3rd Generation - Smart Thermostat - Pro Version - Works With Alexa. Make sure the wire isnt corroded or painted over. Switch on your breaker now to restore electricity to your thermostat. So, if the voltage is adequate, the problem lies behind the AC unit. If you discover any water, that means theres a blockage somewhere. 520 S Casino Center Blvd, Las Vegas,NV89101, If your Nest Thermostat battery is low, check this guide, Nest Thermostat No Power To RH Wire (E74 Error): How To Fix. I had the same no power until adjusting and emptying the float switch. Detach your thermostats display from the base to reveal the wires connected to it. Good luck! Model GMS80704BXCC. With temperature changes (this is in my attic) and vibration the connection between the fuse and the circuit board was not reliable. Here is how to safely unjam a stuck, jammed up garbage disposal, which may be making a humming noise instead of working properly. 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. A small low-voltage wire leads to the switch, which may also help you track it down. It's not installed in a normal fuse holder, it's installed using two female spade terminals. First, follow all the steps one by one until the problem gets resolved. On my system the fuse is on a small circuit board inside the HVAC unit. But, if you're still having intermittent issues, this is something to look into. All other steps checked! Took us a while, but we realized that the 3 Amp fuse on the circuit . This should break up any hard water deposits that may have formed, allowing condensation to flow freely. It may look like a light switch. I know I'm late to the game here, but here's something I found while installing a couple of Nest thermostats today. Did you reboot by disconnecting it from the base and reconnecting? Required fields are marked *. In this case, youll have both an Rh and an Rc wire. link to How To Keep Snakes Away From Your House. If it gets water in it that will shut off the power to the thermostat. 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