Thermostat shows a Wi-Fi icon with an exclamation mark or 'WiFi' error and cannot be controlled from the Tuya/Smart Life app

Safety first: No high-voltage work is needed for network troubleshooting.

Steps to troubleshoot:

• Verify that your router broadcasts a 2.4 GHz network (Tuya thermostats typically do not support 5 GHz only).
• Move your router or add a Wi-Fi extender to improve signal strength near the thermostat.
• On the thermostat, enter pairing mode (often by holding a specific button until the Wi-Fi icon blinks) and re-add the device in the Tuya/Smart Life app.
• Ensure the correct Wi-Fi password is entered and that MAC address filtering is disabled on the router.
• Power-cycle the thermostat and router.
• If the Wi-Fi icon never appears or cannot blink for pairing, the internal Tuya Wi-Fi module may be defective; replace the thermostat or Wi-Fi module if it is a plug-in daughterboard.