← Full guide: Nest Thermostat Won't Connect — Power, Wi-Fi, App Checks
Nest stopped connecting after a new router, SSID, or Wi-Fi password
For “Nest stopped connecting after a new router, SSID, or Wi-Fi password”, a network change is a credential/migration problem until proven otherwise.
Start here
For “Nest stopped connecting after a new router, SSID, or Wi-Fi password”, a network change is a credential/migration problem until proven otherwise. Update the thermostat’s Wi-Fi network for the exact model rather than repeatedly rebooting the old profile.
Check these first
- Confirm new SSID/password/security.
- Check whether all Nest devices dropped together.
- Identify thermostat model/generation.
Fix it in this order
- Use Google’s model-specific change-Wi-Fi flow.
- Keep phone and thermostat near the target network during setup.
- If setup cannot see/connect, use the W/TD code shown rather than generic resets.
Evidence to keep
- Old/new network details
- Model
- Error code
Do not make it harder
- Factory reset as first step
- Changing multiple router settings at once
How you know it is fixed
- Thermostat connects to the intended new network and survives a reboot.
If the obvious fix does not work
- If old SSID/password can be temporarily recreated, it can help isolate whether the thermostat itself is healthy before migration.
- If every device fails on the new router, inspect router compatibility/security rather than each thermostat.
If this still isn't resolved
- Router/ISP support
- Google Nest Support
Sources for this path
Use these references to confirm provider-, model-, policy-, or jurisdiction-specific details before an irreversible step.
Need the complete context?
This page solves one branch. The parent guide covers the full decision, edge cases, alternatives, and related checks.