E195; 1. Turn off the main power to your HVAC system at the breaker. Your HVAC system can have multiple breakers so make sure to turn them all off before moving on. Once the power to your whole HVAC is off, check your furnace and fan. Make sure there are no lights that might indicate your system still has power.

These steps cover the following help codes: E3, E4, E23, E24, E73, E74 or E195. If your Nest thermostat suddenly started showing one of these codes during the hot summer months, visit the following link to learn how to help fix it: Troubleshoot E3, E4, E23, E24, E73, E74 and E195 help codes; Troubleshoot Matter issues

Troubleshoot thermostat power issues during hot weather (E3, E4, E23, E24, E73, E74, or E195 help codes) 5 of 10 Troubleshoot a "No power" alert on a Nest thermostat (E298, E448 or M20 help code)

Troubleshoot thermostat power issues during hot weather (E3, E4, E23, E24, E73, E74, or E195 help codes) 5 of 10 Troubleshoot a "No power" alert on a Nest thermostat (E298, E448 or M20 help code)

Troubleshoot thermostat power issues during hot weather (E3, E4, E23, E24, E73, E74, or E195 help codes) During the hot summer months, if your HVAC system breaks down it may stop sending power to your Google Nest thermostat.

Note: If your thermostat won’t turn on, or if your Nest Thermostat E or Nest Learning Thermostat (3rd gen or earlier) is having power issues, learn how to troubleshoot when your Nest thermostat won’t turn on.

Troubleshoot thermostat power issues during hot weather (E3, E4, E23, E24, E73, E74, or E195 help codes) 5 of 10 Troubleshoot a "No power" alert on a Nest thermostat (E298, E448 or M20 help code)

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Nest products with a stable internet connection automatically update their software. Updates are rolled out gradually, so there may be a delay before your product receives the latest version.