https://www.googlenestcommunity.com/t5/Nest-Thermostats/195-error-no-power-to-red-wire/m-p/707721#M133750 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/706018">@Gonzalesc68</a>&nbsp;</P> <P>Where did you hear the loud pop come from?</P> <P>If from the thermostat then there is a good chance it is bad. You can check it by connecting the Green and Red wires and the blower should turn on.</P> <P>If it doesn't, you should check the fuse on the control PCB in the furnace/air handler. If it is blown you will need to call in a HVAC technician.</P> Wed, 26 Mar 2025 12:28:10 GMT Patrick_Caezza 2025-03-26T12:28:10Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/195-error-no-power-to-red-wire/m-p/707604#M133733 <P>No power to unit after a power surge. Heard loud pop and unit has not power to red wire</P> Wed, 26 Mar 2025 01:14:01 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/195-error-no-power-to-red-wire/m-p/707604#M133733 Gonzalesc68 2025-03-26T01:14:01Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/195-error-no-power-to-red-wire/m-p/707721#M133750 <P><a href="https://www.googlenestcommunity.com/t5/user/viewprofilepage/user-id/706018">@Gonzalesc68</a>&nbsp;</P> <P>Where did you hear the loud pop come from?</P> <P>If from the thermostat then there is a good chance it is bad. You can check it by connecting the Green and Red wires and the blower should turn on.</P> <P>If it doesn't, you should check the fuse on the control PCB in the furnace/air handler. If it is blown you will need to call in a HVAC technician.</P> Wed, 26 Mar 2025 12:28:10 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/195-error-no-power-to-red-wire/m-p/707721#M133750 Patrick_Caezza 2025-03-26T12:28:10Z