Thermostat cannot be added to the Resideo/Honeywell Home app, or pairing fails repeatedly.

Safety first: No HVAC electrical work is required.

Steps to troubleshoot:

• 1. Update app: Ensure you have the latest version of the Resideo/Honeywell Home app installed.
• 2. Check region and model: Confirm that your thermostat model is supported in your region and by the app you are using.
• 3. Reset Wi‑Fi on thermostat: Use the thermostat menu to reset network settings, then follow the in-app instructions to add a new device.
• 4. Remove from previous account: If the thermostat was used by someone else, have them remove it from their account, or perform a factory reset on the thermostat.
• 5. Verify Wi‑Fi security: Use WPA2-Personal security with a simple SSID and password (no special characters that may cause issues).

When to call a professional: If pairing still fails, contact Resideo support with the thermostat model and MAC ID for account-level assistance.