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My Optical Light is flashing, has gone off or has gone red

Written by KCOM Support on 25/10/2023. Posted in Broadband.

If you find that the Optical Light on your Lightstream Fibre ONT (Optical Network Terminal) box is flashing, has gone off or has gone red, this means there may be an issue with the fibre connection coming into your property.

What can I do?

First, please check that the optical cable which comes through your wall into the ONT hasn't become loose. If it has, try pushing the end into the ONT to make sure it's clicked all the way in. Now turn the ONT off and on again from the main socket on the wall.



Something to note

We have a handy interactive troubleshooting tool that can help diagnose and fix the most common in-home broadband issues such as slow speeds and no connection. The tool also covers some of the basic troubleshooting questions that our call handlers would ask you over the phone. Please click here to give it a try: Broadband Troubleshooter

Still no luck?

If you're still having issues, please contact us to report this so we can take a look.

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