https://www.googlenestcommunity.com/t5/Nest-Thermostats/New-account-now-heat-fan-not-working/m-p/795704#M143903 <P>Hello,</P><P>I just moved into a new apartment and set up my account on a Nest thermostat that had been working previously. Its a heat/cool system, and it uses a forced air gas heat system. The wiring setup has Y W G R.</P><P>My problem: when the heat turns on, I hear the gas flames turn on, but when the fan is supposed to come on, instead the gas turns off. It tries this three times and then stops altogether.</P><P>when I turn the mode from heat to off, I can then turn on the fan manually. But in heat mode the fan does not come on.</P><P>ive attempted many resets, both “activate” and “don’t activate” for the fan during heating, and not sure what else to try.</P><P>one potential factor: I initially installed the nest app before the google home app. I just tried deleting the nest app, but still having the same issue.</P><P>any help appreciated!</P> Sun, 08 Mar 2026 16:05:20 GMT AJ34 2026-03-08T16:05:20Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/New-account-now-heat-fan-not-working/m-p/795704#M143903 <P>Hello,</P><P>I just moved into a new apartment and set up my account on a Nest thermostat that had been working previously. Its a heat/cool system, and it uses a forced air gas heat system. The wiring setup has Y W G R.</P><P>My problem: when the heat turns on, I hear the gas flames turn on, but when the fan is supposed to come on, instead the gas turns off. It tries this three times and then stops altogether.</P><P>when I turn the mode from heat to off, I can then turn on the fan manually. But in heat mode the fan does not come on.</P><P>ive attempted many resets, both “activate” and “don’t activate” for the fan during heating, and not sure what else to try.</P><P>one potential factor: I initially installed the nest app before the google home app. I just tried deleting the nest app, but still having the same issue.</P><P>any help appreciated!</P> Sun, 08 Mar 2026 16:05:20 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/New-account-now-heat-fan-not-working/m-p/795704#M143903 AJ34 2026-03-08T16:05:20Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/New-account-now-heat-fan-not-working/m-p/796060#M143930 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/866360">@AJ34</a>&nbsp;,</P> <P>Most gas furnaces have an Integrated Furnace Control-board. &nbsp;The furnace heat exchanger must reach 250°F before it turns on the blower fan.</P> <P>&nbsp;Can you get me the manufacturer and model number of your gas furnace?</P> <P>The Cooling Wizard</P> Tue, 10 Mar 2026 06:43:22 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/New-account-now-heat-fan-not-working/m-p/796060#M143930 CoolingWizard 2026-03-10T06:43:22Z