https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/55736#M12371 <DIV>Your current thermostat is only compatible with the Nest 3rd Gen Learning Thermostat.</DIV> <DIV>&nbsp;</DIV> <DIV>I would suggest wiring it like this.</DIV> <DIV>&nbsp;</DIV> <DIV>Green - G to G</DIV> <DIV>White - W to W1</DIV> <DIV>Red - Rh to Rc - jumper to Rc not needed</DIV> <DIV>Blue - Y to Y1</DIV> <DIV>&nbsp;</DIV> <DIV>Yes, your system has no C wire and I would suggest checking to see if there is an extra wire going to your furnace/air handler that you can use for one. If there are no extra wires, I would suggest using the Nest Power Connector so you have a C wire.</DIV> Fri, 03 Dec 2021 04:35:24 GMT Patrick_Caezza 2021-12-03T04:35:24Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/53056#M11679 <P>Hello,</P><P>As you can see on the attached picture my system has 4 wires connected to Y, RH, G and W. It has no wire directly connected to C but has 3 jumper wires from RH to RC,&nbsp; from RC/to C and between another C terminal and Y.</P><P>Is my system compatible with a Nest Learning Thermostat (3rd gen) and if yes how do I wire it? Does it fall in the categories of a system with no C wire?&nbsp;&nbsp;</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="thermostat wirering.jpg" style="width: 999px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/2699i017A5AF9C5E06265/image-size/large/is-moderation-mode/true?v=v2&amp;px=999" role="button" title="thermostat wirering.jpg" alt="thermostat wirering.jpg" /></span></P> Tue, 30 Nov 2021 07:19:19 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/53056#M11679 jpclamme 2021-11-30T07:19:19Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/55736#M12371 <DIV>Your current thermostat is only compatible with the Nest 3rd Gen Learning Thermostat.</DIV> <DIV>&nbsp;</DIV> <DIV>I would suggest wiring it like this.</DIV> <DIV>&nbsp;</DIV> <DIV>Green - G to G</DIV> <DIV>White - W to W1</DIV> <DIV>Red - Rh to Rc - jumper to Rc not needed</DIV> <DIV>Blue - Y to Y1</DIV> <DIV>&nbsp;</DIV> <DIV>Yes, your system has no C wire and I would suggest checking to see if there is an extra wire going to your furnace/air handler that you can use for one. If there are no extra wires, I would suggest using the Nest Power Connector so you have a C wire.</DIV> Fri, 03 Dec 2021 04:35:24 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/55736#M12371 Patrick_Caezza 2021-12-03T04:35:24Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/128699#M27889 <P>I have 4 wires</P><P>Green,white and yellow</P><P>Red wire with jumper rc and rh</P><P>How is this done on the nest</P> Thu, 24 Mar 2022 17:09:37 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Is-my-system-with-4-wires-and-3-jump-wires-compatible-with-the-Nest/m-p/128699#M27889 Jonhhawthorne14 2022-03-24T17:09:37Z