Can play 1s work on wifi without at least one being hardwired to router.

Have you told Sonos your WiFi details? With a cable connected it doesn't need them and will form its own mesh network between each speaker. If you remove the cable, it needs a way to authenticate onto your network - the WiFi password.  Each speaker will then use those details to connect directly to your network/router.  With only one router, often the ‘cable’ method can be a better option as without this mesh setup (each speaker ‘talks’ to others - called Sonosnet), each one needs to be within reach of the router itself and not just another speaker.

This may help to switch.

Some of these may help

https://support.sonos.com/en-us/search?q=Wired+to+wireless

Thank you for the replies.  When i disconnect from the router my products ( which are all powered on) aren't picked up.   As soon as i hardwire a speaker to the router the whole set up appears.  When i try to add via wifi, i just receive an exclamation mark screen.  Do you have to put the speakers into some mode in order to set up again?  I am trying to avoid a factory reset.  Sonos know about my wifi and doesn't ask for a password as i think ive been through this and changed it.

Assuming you only have a single router (no extenders etc.), the you should be able to connect via WiFi.

If you have a new router this will have a new name (SSID) and password - you need to update these details in the Sonos App, have you? If so, maybe remove them and re-add them.  You are right though, avoid a factory reset unless specifically advised to do so.

Do this, it will save a lot of time reconfiguring all the devices that connect to your Home WiFi. Check your router documentation, and change the WiFi name/SSID to be the same as your old WiFi network name, and also make sure password is the same as your old WiFi password.

I may be wrong (as ​@Corry P has liked your post) but that was not my understanding.  I thought you only needed to factory reset the older devices if wiring them wasn't an option. If it is, then I thought you could follow the link I posted to switch to a WiFi setup.

Hi ​@sjw 

Good question - I’ll be happy to clarify.

Older components (those without BTLE (Bluetooth Low Energy)) must be factory-reset to join a new WiFi network, even if SonosNet is (temporarily) up. The only way around this would be to set the credentials for the new router to be the same as the last, as ​@nik9669amentioned. Please see the Unsupported Products section of our Connect Sonos to a new router or WiFi network help page for full details and best practices for these devices.

I hope this helps.

Thanks ​@Corry P .

In the link I posted, it mentions a couple of methods of doing it, one being ‘temporarily’ using a wired setup.

It then says

“If your Sonos system only contains products from the list above and you can’t wire a product to your router, you’ll need to reset each product and set them up again as a new system”.  Why does it have the ‘and you can’t wire a product to your router’ text if being able to do that still necessitated a full reset?

Is another option temporarily adding a newer device to the system and adding the details via that?  They're then ‘shared’ to the older devices at which point it can be removed (the newer device)?

Hi ​@sjw 

If you are referring to the Switch Sonos between a wireless and wired setup help page, I don’t think that page has (yet?) been adapted to account for non-BTLE products on the new app.

If you do not have any non-BTLE products, then the instructions on that page are accurate, but it does not cover switching from one WiFi to another - only going from SonosNet to WiFi, or vice versa, where an ethernet cable is going to in use at some point.

The page I linked to in my previous post is a better fit to the OP’s situation, I think - it is for new routers, rather than change in connection method.

I shall see if I can get the page you linked-to improved.

I hope this helps.