Have you followed the new router - installation instructions FAQ? Those steps should get you reconnected. 

However, should they not, there is a very slight possibility that there may be a hardware fault, in which case you would need to call Sonos Support directly to discuss it.

When you speak directly to the phone folks, there are more options available for them to assist you.

Thanks Bruce. I’ve done everything on the site and it seems that my iPhone knows that Sonos  is there but it’s showing as an insecure site! I’m only assuming that could be a problem. Also tried to get connected with cable but after searching I get ‘Sonos not found’!  I’m not too smart when things go wrong I’ll take your advice and contact Sonos. Thanks again for your interest.