-Check all the wires and their connections making sure they are properly secure at the Nest and on the unit.-Check continuity of all wires from Nest to unit-power off.-Remove C wire, nut it off so it doesn't touch any other wires, flip breaker back on.-Remove Nest, try charging it with usb cable on computer. Diagnose bad sensors as possible cause. Update 4: Nest now acknowledging a "partial outage" via their System Outage page. Remove Rh and G and connect them together with a wire nut or simply twisting together. If you have other products in the Nest app Tap Settings in the top right. If you don’t have other products in the app. If the Nest is losing power from Rh, it would make me think that the furnace isn't outputting power anymore on the 24V system. ... My nest thermostat is saying there is no power to the Rh wire even though I know that there is because the old basic thermostat works just fine. Use these steps to add the thermostat to the app to get the wiring diagram. I have a Nest thermostat and it appears to be working fine. One possible solution for the rc wire nit providing power to your nest thermostat. My new Nest Thermostat Says E74 No power to Rh wire detected, but there is power. I'd more lean towards an issue with the furnace not liking generator power, or somehow it's not resetting and coming back on when the generator comes back on. When this happens your system stops sending power to your Nest Thermostat and causes … ~~and finally~~ So that wouldn't be my first guess. I reset my router and am able to access the internet but not my home network of Google devise. When this happens, your thermostat will display an E3 Test. Select Add product. We’re here to help. My upstairs HVAC is not heating or cooling. Bit of Nest history. Tap Add product on the home screen and follow the app instructions. Discover connected home devices from Nest – thermostats, indoor and outdoor security cameras, smoke and carbon monoxide alarm, security system, video doorbell and more. Rh is power input for the heating side. Talk to a Google Nest expert. Usually the issue is contained to the cooling side. Heater blowing but cold air no heat. 01-01-2018, 07:41 AM #3 donmerch Open the Nest app. @CA_in_TO @googlenesthelp I cannot access any of my Nest or Google devices at home. Update 5: All my cameras are back online and Nest has updated the status of “partial outage” to “ok”. When I set the Nest to "test" mode for either the heating or the cooling function all I get is a … read more The Nest devices won't connect and my Google Mac Hub just keeps saying encountered a problem and to try again. Learn more > Nest.com has moved to the Google Store. Follow the app instructions. 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