The thermostat cannot be added to the Honeywell Home / Resideo app (pairing fails).

Note: This is a network/app configuration issue.

• Use 2.4 GHz Wi-Fi: Ensure your phone and thermostat are connecting to a 2.4 GHz network, as many Honeywell Home thermostats do not support 5 GHz.
• Verify credentials: Double-check the Wi-Fi password and SSID entered during setup.
• Remove old account link: If the thermostat was previously registered, remove it from the old Honeywell Home account or perform a factory reset to clear registration.
• Retry with strong signal: Stand near the thermostat with your phone during setup to ensure good Wi-Fi and Bluetooth (if used) signal.
• Wait and retry: If Honeywell cloud services are temporarily unavailable, wait 30–60 minutes and try again.