Did you know?

Yes still need help. Haven’t touched these wires in ages - e74 - verified it is seated & down.The fix for no power to Rh wire for me was the float. The water drain needed to be cleaned out.Jan 23, 2023 · This problem caused battery to die hard. It is taking way too long to charge up to maximum capacity. I can't do factory reset without full battery power. I know the wired connections are good. I checked the RH Connector wire and it has a steady 27.4VAC. There is no longer any reason why this is keeps faulting out. An E74 Error Message No power to RH Wire means that the Nest Thermostat does not detect power from the red RH wire. Without power, the thermostat …But, a Nest thermostat could occasionally cease functioning and show the messages “lost power” or “no power to RC wire detected.” For a few days, I grappled with the same problem, and when I surfed the internet and couldn’t find something comprehensive and helpful, I had to call an HVAC technician.Feb 9, 2022 · If the thermostat displays an E74 error: no power to Rh wire, try reconnecting the Rh wire. If that isn’t the issue, check your HVAC float switch for clogged drainage pipes. You might also have a blown HVAC control unit fuse. If none of these fix the code, call Nest support. Print. No power wires detected. Rc or Rh wire required. Troubleshoot power: E3, E23 and E73. No power to Rc wire detected. Troubleshoot power: E4, E24 and E74. No power to Rh wire detected. Troubleshoot power: E5, E25, E75, E155 and E255. No heating or cooling detected. ... A C wire or Nest Power Connector is recommended for your thermostat ...Follow these methods to determine if this is the reason why your Rh wire isn’t receiving power: Tap on the E74 Error: RH wire no power code that appears on the …Hello everyone, We wanted to follow up and see if you are still in need of any help. Please let us know if you are still having any concerns or questions from here, as we would be happy to take a closer look and assist you further. Thanks for answering, Patrick_Caezza and Jenelyn. Regards, Emerso...If you're always charging nest then you DONT have 24 volts power direct all the time. Most of the time it’s the C wire that’s missing. You can alway work AC system with out a stat by putting proper colored wires together. More important than the colors are the imprinted LETTERS on the mounting plat...Check HVAC Float Switch. The condensate overflow switch located near the Air Handler unit, inside your home. This is to protect your home from possible water overflow from the HVAC unit. If your drainage pipe is not clean, or if there has any clog, the overflow switch will disconnect the power and turn off the AC.Just installed a new nest gen 3 learning thermostat on 01/14/2022 which went without a hitch and worked fine until this morning. My house was cold and my nest thermostat did not show any temperature. It had a e74 code, no power to RH wire. Reset my power and it came on for a short but it failed just minutes later. Apr 16, 2023 · I am having the same issues e74 saying no rh power. However I have two other thermostats on the same system non nest brand and they are working fine Check your spill reservoir on your unit. On many units,if the drain is clogged or overwhelmed, an auto shutoff will be triggered by a float valve. This happens a lot during the change of seasons. This is the message that would be displayed, although there are other causes as well that could be at play. Just installed a new nest gen 3 learning thermostat on 01/14/2022 which went without a hitch and worked fine until this morning. My house was cold and my nest thermostat did not show any temperature. It had a e74 code, no power to RH wire. Reset my power and it came on for a short but it failed just minutes later.The fix for no power to Rh wire for me was the float. The water drain needed to be cleaned out.Jul 18, 2023 · You can follow this guide as well to isolate the issue: Turn the power breaker off. Remove the red wire from RH. Ensure that the wire is flat and straight. Move the red wire from RH to RC terminal. The terminal tab should be pressed down. Make sure to turn the breaker back on. Check if the issue persists. Best, Thanks for posting in the Google Nest Community forum. E74 code will show if your Nest Thermostat doesn't detect power to a wire, or it can't detect the wires in your thermostat. Please try to troubleshoot your systems power and wiring by following this link. Please let us know how it goes. I appreciate your help, @Patrick_Caezza and @LARVA. Best,

Hello everyone, We wanted to follow up and see if you are still in need of any help. Please let us know if you are still having any concerns or questions from here, as we would be happy to take a closer look and assist you further. Thanks for answering, Patrick_Caezza and Jenelyn. Regards, Emerso...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.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 to look for the HVAC technician's telephone number. But is that necessary? Can't you troubleshoot and fix the issue yourself?Google, I don’t care that I received a reply badge! I need my a/c to work.

Hi, finally I solved this issue and my e74 issue was caused out off power, we checked circuit breaker and move it back to normal. Then we fixed issueIf the thermostat displays an E74 error: no power to Rh wire, try reconnecting the Rh wire. If that isn’t the issue, check your HVAC float switch for clogged drainage pipes. You might also have a blown HVAC control unit fuse. If ……

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. E74 error no power to Rh wire D Danjoyce1 Community M. Possible cause: I’m having the same issue. Worked fine for years until recently. HVAC tech came out l.