https://www.googlenestcommunity.com/t5/Nest-Thermostats/Wiring-compatibility/m-p/748490#M138692 <DIV class="">&nbsp;</DIV><P>I need to know if my thermostat is compatible with the nest learning thermostat third generation:</P><P>I do not see an option to attach a photo but my old system had</P><UL><LI>a black wire on W-2</LI><LI>A red wire on RC</LI><LI>A white wire on O</LI><LI>a yellow wire on Y</LI><LI>a green wire on G</LI><LI>a blue wire on B</LI></UL><P>can anyone tell me if this is compatible? If so, where should the new wires go on the new system?</P> Thu, 25 Sep 2025 19:26:00 GMT Ktmcrthy 2025-09-25T19:26:00Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Wiring-compatibility/m-p/748490#M138692 <DIV class="">&nbsp;</DIV><P>I need to know if my thermostat is compatible with the nest learning thermostat third generation:</P><P>I do not see an option to attach a photo but my old system had</P><UL><LI>a black wire on W-2</LI><LI>A red wire on RC</LI><LI>A white wire on O</LI><LI>a yellow wire on Y</LI><LI>a green wire on G</LI><LI>a blue wire on B</LI></UL><P>can anyone tell me if this is compatible? If so, where should the new wires go on the new system?</P> Thu, 25 Sep 2025 19:26:00 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Wiring-compatibility/m-p/748490#M138692 Ktmcrthy 2025-09-25T19:26:00Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Wiring-compatibility/m-p/749267#M138756 <P>Hi&nbsp;<a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/792698">@Ktmcrthy</a>,</P> <P>&nbsp;</P> <P>Thanks for posting in the community. I understand you're looking for help to determine if your current thermostat's system is compatible with the Nest Learning Thermostat (3rd gen). I appreciate that you've shared the information about your wiring system. No worries, I'd be more than glad to share more details with you.</P> <P>Based on your wiring information, it appears to be compatible with the Nest Learning Thermostat. However, to be completely sure about how to wire it, could you please share a picture of your current wiring installation?&nbsp;</P> <DIV>You can upload the picture by clicking on the "camera icon" before sending the reply.&nbsp;<LI-WRAPPER></LI-WRAPPER>This information will help me to visually confirm the wire terminals and provide you with a more accurate installation guide.</DIV> <P>Please keep me posted.</P> <P>&nbsp;</P> <P>Regards,<BR />Jonathan</P> Sun, 28 Sep 2025 17:28:31 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Wiring-compatibility/m-p/749267#M138756 sicsacol 2025-09-28T17:28:31Z