What should I do if I encounter an ER1 error code?
An ER1 error indicates a problem with your internet connection, such as the Wi-Fi signal being too weak or incorrect network name (SSID) and password. Ensure the router supports WPA2 encryption and that you have entered the correct credentials for your WiFi network. Check if the SSID is compatible for 2.4GHz frequency networks. (Page 23)
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 23
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