Sensi app cannot discover or connect to the thermostat during setup

Safety: No HVAC power work is required.

Steps to resolve:

• Confirm phone network: Ensure your smartphone is connected to the same 2.4 GHz Wi‑Fi network you intend to use for the thermostat.
• Enable permissions: Allow the Sensi app to use Bluetooth and location services if prompted, as some models use these for discovery.
• Put thermostat in pairing mode: Follow the Sensi instructions to enter Wi‑Fi setup or pairing mode on the thermostat. Look for a specific icon or on‑screen prompt.
• Disable AP isolation: In your router settings, turn off client isolation or guest network restrictions that prevent devices from seeing each other on the LAN.
• Retry setup: Close and reopen the Sensi app, then repeat the setup process from the beginning.

When to replace: If the thermostat never broadcasts its setup network or cannot be discovered by any compatible device, the communication module may be defective and the thermostat may need replacement.