Cel-Fi RS2 Dual Band Step-by-Step Troubleshooting Guide (SBS 16) December 16, 2019 15:48 Updated Solid red power light on your Window Unit Looking at your Window Unit with the solid red power light do you have bars of cellular coverage? Bars No Bars Related articles Cel-Fi RS2 Dual Band Step-by-Step Troubleshooting Guide (SBS 27) Cel-Fi RS2 Dual Band Step-by-Step Troubleshooting Guide (SBS 25)