F13 displayed; thermostat shows incorrect date/time zone or cannot sync with the cloud.

Safety first: No electrical work is required.

Steps:

• 1. Check internet connection: Verify that other devices on the same Wi-Fi network can access the internet.
• 2. Router firewall/DNS: Ensure your router is not blocking outbound connections for the thermostat. Use automatic DNS or a reliable public DNS provider.
• 3. Reconnect thermostat to Wi-Fi: Forget the network on the thermostat and reconnect, entering the password again.
• 4. Update firmware: Use the Ideal app to check for and install firmware updates.
• 5. Manual time setting: If cloud sync is unavailable, set the time and date manually on the thermostat to restore scheduling until connectivity is resolved.