https://www.googlenestcommunity.com/t5/Nest-Thermostats/Does-not-recognize-Rh-connection-to-system/m-p/102188#M22744 <P>After years of successful use, Nest no longer recognizes power from Rh wire. &nbsp;It sees that the Rh wire is seated. &nbsp;The Rc wire is recognized as connected to the system. &nbsp;Is the battery faulty? &nbsp;It work fine and then suddenly stopped after years of use. &nbsp; &nbsp;When the power runs down, I have no heat in the house. &nbsp;I have to disconnect and do a USB charge. &nbsp;</P> Wed, 09 Feb 2022 02:02:19 GMT Bobeziopete 2022-02-09T02:02:19Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Does-not-recognize-Rh-connection-to-system/m-p/102188#M22744 <P>After years of successful use, Nest no longer recognizes power from Rh wire. &nbsp;It sees that the Rh wire is seated. &nbsp;The Rc wire is recognized as connected to the system. &nbsp;Is the battery faulty? &nbsp;It work fine and then suddenly stopped after years of use. &nbsp; &nbsp;When the power runs down, I have no heat in the house. &nbsp;I have to disconnect and do a USB charge. &nbsp;</P> Wed, 09 Feb 2022 02:02:19 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Does-not-recognize-Rh-connection-to-system/m-p/102188#M22744 Bobeziopete 2022-02-09T02:02:19Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Does-not-recognize-Rh-connection-to-system/m-p/102548#M22848 <P>I've recently been having the same issue, except now even after 2 full days of usb charging, the thermostat still shows the same error message and the heat will not turn on. We have run through all of the troubleshooting steps multiple times, charge via usb, then reconnect and it says "no power for Rh" and shuts down to "charge"--except there's a blinking green light constantly which supposedly means that it's fully charged.&nbsp;</P> Wed, 09 Feb 2022 17:24:01 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Does-not-recognize-Rh-connection-to-system/m-p/102548#M22848 rakel7897 2022-02-09T17:24:01Z