This is because your modem is picking up that it's located in an area that provides little or no 4G signal.
You will need to place the modem in a different location to get signal. Try shifting the modem around your house, place the modem near a window to maximise signal strength.
Article ID: 138
Created On: Fri, Jun 10, 2016 at 7:11 PM
Last Updated On: Mon, Jul 4, 2016 at 8:48 AM
Online URL: https://support.skinny.co.nz/article/why-is-the-lsquo;lte-light-solid-red-138.html