I updated my TP-Link EAP225V3 WiFi access point firmware from 5.1.1 to 5.1.6 and the Gen1 nest thermostat would no longer connect to WiFi (w2 error). All other WiFi devices in the house, total of 14, including a newer nest thermostat and a nest doorbell camera continued to work fine.
- Went through all the Nest troubleshooting steps without success.
- Full factory reset on the nest without success.
- Tried many changes on the TP-Link access point WiFi settings including setting up a new SSID without a password. No success.
The Nest technical info: Model: Diamond-1.13, Backplate-1.9a, Software: 5.9.4-5, Battery 3.86 volts
Downgraded the EAP225 firmware back to 5.1.1 and the nest thermostat connected again with the original WiFi settings. I have reported this to TP-Link.
