Thermostat cannot join Wi‑Fi network; Kasa app shows WiFi-01 or similar connection failure

Note: This is a network configuration issue, not a hardware failure in most cases.

• Confirm network band: Ensure your router is broadcasting a 2.4 GHz network. Many Kasa thermostats do not support 5 GHz only.
• Check password: Re-enter the Wi‑Fi password carefully in the Kasa app. Avoid special characters if your router allows simplifying the password.
• Unhide SSID: Temporarily set your router to broadcast the SSID (network name) instead of hiding it, then try pairing again.
• Security mode: Use WPA2-PSK (AES) if possible. Some older or mixed WPA/WPA2 modes can cause issues.
• Reduce distance: During setup, stand near the thermostat with your phone and ensure the signal strength is good.
• Router reboot: Restart your router and modem, then retry the Kasa pairing process.