I go through the TECH INFO menu to the POWER tab and check the Vin & Voc and they're both reading a steady 23.36v with lin reading 200mA (i). I did that, but the Nest is still saying there's no power detected on the C wire or the Rh terminal. Is there supposed to be 24vac on … I have inserted my black C wire into the C molex port: https://i.imgur.com/XR9lSWv.png, I can't splice it with the blue wire running to ground because it's locked into the connector quite tightly together with a green ground wire: https://i.imgur.com/ZnGHID6.png. I’ve been having a similar issue with my Rh wire on the gen 3 device. When I removed the old thermostat, the wires were connected to W1, Rh and G. The Nest would not stay charged, so I read enough to realize I would need a common wire. I was having issues with my Nest Thermostat E and got advice from Nest to install a C wire. Furnace is a Lennox 80UHG with a Surelight Integrated control board. Currently I have the wire going from the "C" terminal in the nest to the 24vac terminal at the common. This wise gadget permits you to control temperature via net without difficulty. (Air conditioner) W terminal will use the white wire. When it doesn't emerge, it signs the wire has been correctly inserted. In this really short video you will learn how to connect an unused wire so it can be used as your C wire, which in a lot of cases has solved the problem of a thermostat not working. The error is E74 - No power to Rh wire detected. You will need to provide email address and sign up before getting the convenience of controlling Nest thermostat in your smartphone. Each of these wires has a name featuring a single letter (listed below). $14.99 $ 14. Amazon Certified: Works with Alexa. After completing this, you may also prepare the application for remote management if desired. 18V 800MA Transformer, AC Power Supply Compatible with Ring Doorbell and Nest Doorbell, Nest Learning Thermostat Ecobee, Honeywell, C Wire Adapter with 3M (118") Cable 4.3 out of 5 … 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 … Wifi thermostat but no C wire solutions Pick a different thermostat. However, from Red (Rc/Rh) to Black (C), I get 0.009v! C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round). That indicated a problem with the Nest or its base. I’m no electrician or furnace expert but I was able to handle this. The Simple thermostat requires a C-wire connection for continuous power in order to maintain Wi-Fi connectivity. If you have used the thermostat for a long time, it could just have ‘died of old age’. Are you saying that I can just wire the C wire to blue wire that is not the ground one (is it a neutral wire?) Click to see price. They provide a source of 24V power coming from the HVAC control board. This is not a problem when the HVAC system is running in either heat or cool mode. To enjoy this feature, download the application in Google Play or App Store. Troubleshoot low power N5, N25 and N75. So I opened the furnace, and connected the spare blue wire to the C terminal on the control board. furnace). Input Wi Fi password and move to checkmark icon to complete. You need to use a cable with 3 wire cores, 2 for power +/- and 1 for communication with the original adaptor. 99 $15.99 $15.99. … read more The following step: set up the heating and cooling system in order the gadget works correctly. 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