https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/20709#M3807 <DIV>&nbsp;</DIV> <DIV>We can try to check if there's any loose wiring at the base plate. I suggest to turn off your breakers and remove the Nest thermostat display and remove the wire in the Rh or Rc terminal. Put the wire back in the terminal, making sure they are properly seated.</DIV> <DIV>&nbsp;</DIV> <DIV>After doing so, please restart your Nest device</DIV> <DIV>&nbsp;</DIV> <DIV>Let me know how it goes.</DIV> <DIV>&nbsp;</DIV> Fri, 01 Oct 2021 19:09:53 GMT Ashepherdson 2021-10-01T19:09:53Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/20470#M3762 Fri, 01 Oct 2021 15:09:27 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/20470#M3762 f15rotor 2021-10-01T15:09:27Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/20709#M3807 <DIV>&nbsp;</DIV> <DIV>We can try to check if there's any loose wiring at the base plate. I suggest to turn off your breakers and remove the Nest thermostat display and remove the wire in the Rh or Rc terminal. Put the wire back in the terminal, making sure they are properly seated.</DIV> <DIV>&nbsp;</DIV> <DIV>After doing so, please restart your Nest device</DIV> <DIV>&nbsp;</DIV> <DIV>Let me know how it goes.</DIV> <DIV>&nbsp;</DIV> Fri, 01 Oct 2021 19:09:53 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/20709#M3807 Ashepherdson 2021-10-01T19:09:53Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/34848#M7310 <P>Hey&nbsp;f15rotor,</P> <P>&nbsp;</P> <P>It has been a few days since the last reply, and&nbsp;I am going to lock the thread at this time. If you have any questions, please feel free to create a new post.&nbsp;<BR /> <BR /> Best regards,<BR /> Jake</P> Fri, 29 Oct 2021 18:14:23 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/how-to-fix-e-74-error/m-p/34848#M7310 Jake 2021-10-29T18:14:23Z