QL-820NWB FAQs & Troubleshooting QL-820NWB Not your product? Sort by Updated Date Popularity 1 Results 1. 22.10.2020 Wi-Fi® LED is lit in blue (QL-810W) or WLAN icon appears on the LCD (QL-820NWB) but the printer cannot communicate with other devices via Wi-Fi. Connecting to a Mobile Device FAQs & Troubleshooting