https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72140#M16200 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211228_221452926.jpg" style="width: 4032px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3825i1FE391486B924B50/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211228_221452926.jpg" alt="PXL_20211228_221452926.jpg" /></span></P><P> i only have red, white and blue wires and the compatibility checker asked me to contact support to confirm compatibility.&nbsp; Will the nest work with my system or do I need to install a constant power wire for it to work?</P><P>Thanks in advance.</P> Tue, 28 Dec 2021 23:56:26 GMT MikeInDc 2021-12-28T23:56:26Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72140#M16200 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211228_221452926.jpg" style="width: 4032px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3825i1FE391486B924B50/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211228_221452926.jpg" alt="PXL_20211228_221452926.jpg" /></span></P><P> i only have red, white and blue wires and the compatibility checker asked me to contact support to confirm compatibility.&nbsp; Will the nest work with my system or do I need to install a constant power wire for it to work?</P><P>Thanks in advance.</P> Tue, 28 Dec 2021 23:56:26 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72140#M16200 MikeInDc 2021-12-28T23:56:26Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72205#M16207 <P>If the Blue goes to common on the heater then you are good to go you would have Rh is power&nbsp; C is common&nbsp; and W is heat&nbsp;</P> Wed, 29 Dec 2021 02:44:44 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72205#M16207 Houptee 2021-12-29T02:44:44Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72294#M16224 <P>Thanks for the response.&nbsp; I used the support chat option to connect to a tech and was informed that my particular Trane system is not compatible with Nest.&nbsp; Trane xc95m. Bummer.</P> Wed, 29 Dec 2021 10:35:41 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Confirming-Nest-Wire-compatibility/m-p/72294#M16224 MikeInDc 2021-12-29T10:35:41Z