Nest thermostat shows N4 and cannot connect to the Nest service even though Wi‑Fi is connected

Note: N4 is a cloud/service connectivity issue.

• Check Nest service status: Visit Google's Nest service status page from another device to see if there is a known outage.
• Verify time settings: Ensure the Nest has the correct time zone and time (usually automatic via network).
• Relink account: In the Google Home app, remove the thermostat and then add it again, following the pairing instructions.
• Router configuration: Ensure that outbound HTTPS and standard ports (443) are not blocked by firewall rules.

If N4 persists and no outage is reported, contact Google Nest support for account-level troubleshooting.