Red led on router

[Pop04]

The red led keeps coming on on the router and we get messages on the tv's saying there's an issue 

[JimM1]

@Pop04 What hub do you have, also what service do you have from sky! Link to the lights and hubs below!

This link providers information about the coloured lights on the various hubs
https://www.sky.com/help/articles/hub-lights-explained-start