https://www.googlenestcommunity.com/t5/Nest-Thermostats/Could-someone-please-help-me-set-up-my-4th-Gen-Thermostat/m-p/709628#M133981 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/625081">@TroyG</a>&nbsp;</P> <P>If the heat pump stopped working several years ago, then the A/C could not still work, as the heat pump is the A/C.</P> <P>The only thing that could work is the Gas furnace.</P> Thu, 03 Apr 2025 22:52:07 GMT Patrick_Caezza 2025-04-03T22:52:07Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Could-someone-please-help-me-set-up-my-4th-Gen-Thermostat/m-p/709444#M133951 <P class="">Could someone please help me set up my 4th Gen Thermostat?</P><P class="">I have a Lennox X15 heat pump and a G50UH-36B gas furnace. The heat pump stopped working many years ago, and our HVAC company bypassed it but could still run the ac. I recently purchased the 4th Gen Thermostat and have been struggling to wire it so that it only controls the gas furnace and the AC—completely bypassing the heat pump.</P><P class="">The previous thermostat was wired as follows:</P><UL><LI><P class=""><STRONG>C</STRONG> = black wire</P></LI><LI><P class=""><STRONG>O</STRONG> = orange</P></LI><LI><P class=""><STRONG>W2</STRONG> = white</P></LI><LI><P class=""><STRONG>W/E</STRONG> = jumper wire from W2</P></LI><LI><P class=""><STRONG>RH</STRONG> = red</P></LI><LI><P class=""><STRONG>RC</STRONG> = jumper wire from RH</P></LI><LI><P class=""><STRONG>G</STRONG> = green</P></LI><LI><P class=""><STRONG>Y</STRONG> = yellow</P></LI></UL><P class="">Any help would be greatly appreciated!</P><P>&nbsp;</P> Thu, 03 Apr 2025 02:33:13 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Could-someone-please-help-me-set-up-my-4th-Gen-Thermostat/m-p/709444#M133951 TroyG 2025-04-03T02:33:13Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Could-someone-please-help-me-set-up-my-4th-Gen-Thermostat/m-p/709628#M133981 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/625081">@TroyG</a>&nbsp;</P> <P>If the heat pump stopped working several years ago, then the A/C could not still work, as the heat pump is the A/C.</P> <P>The only thing that could work is the Gas furnace.</P> Thu, 03 Apr 2025 22:52:07 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Could-someone-please-help-me-set-up-my-4th-Gen-Thermostat/m-p/709628#M133981 Patrick_Caezza 2025-04-03T22:52:07Z