← Full guide: Nest Thermostat Won't Connect — Power, Wi-Fi, App Checks
Nest W1, W2, W3, or W4: router, security, DHCP, or Internet layer
W1–W4 are different Wi-Fi failures: power-saving compatibility, router security, DHCP/IP assignment, or Internet reachability.
Start here
W1–W4 are different Wi-Fi failures: power-saving compatibility, router security, DHCP/IP assignment, or Internet reachability. Fix the layer named by the code instead of resetting the thermostat blindly.
Check these first
- Read the exact W code on the thermostat.
- Confirm other devices have Internet.
- Check router security/DHCP or compatibility based on the code.
Fix it in this order
- Use Google’s help-code table to map the code.
- Correct that router/network condition.
- Restart network and thermostat if needed.
- Retry connection.
Evidence to keep
- Exact W code
- Router model/settings changed
- Reconnect result
Do not make it harder
- Broad factory reset before code-specific router checks
How you know it is fixed
- Thermostat receives IP/Internet and stays connected.
If the obvious fix does not work
- If the code changes, follow the new layer; do not keep the old fix.
- If the router is managed by an ISP and required settings are unavailable, have ISP support make the change.
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.