ERA 300 will not connect to network

With all the resets you have probably caused yourself problems. 

For now work on getting your old Sonos connected and working again, then give the new 300 another try.

First STOP factory resetting all your speakers. Doing so only resolves an issue in very few cases and erases data that might be used by Sonos Technical Support. Pease answer the following questions:

Did you follow the steps in this link?

• How many Era 300’s are you trying to add?
• Will the speaker(s) be used as standalone or if two as a stereo pair or surrounds for a Sonos sound bar?
• Does your network have different SSID’s (names) for 2.4Ghz and 5Ghz?
• Is your Sonos running on S1 or S2 setup?

If not too much trouble please list you Sonos products in your profile. Doing so allows us see what other products are involved that may result in an incompatibility issue with the Era 300’s. 

Couple of notes, since it’s not clear from your original post.

1. If the Sonos speakers were not unplugged when you reset your router, you may not have received the full benefit. I always encourage people to have the Sonos devices unplugged when they reboot their router.
2. It isn’t clear (and I’ve never gotten that error message), but the Era 300s only run using S2 (the OS that operates on the speaker, and has a matching controller app that you have installed on your mobile device). This might be moot, though, as you may not be able to even get that error message if you’re using S1…but thought it might be worth mentioning for others that run across this thread. 

I have 2 Era 300’s that will be used as surrounds with the Arc.  These are the units I receive the error message. 
 

I have one Sonos Gen 1 sub that wouldn’t hook up to the network.

 My other speakers Sonos Arc, Sonos One, and have 2 soaps 5’s in stereo mode. 
 

I am using the S2 app.  
Network has no different SSID’s

thanks for any help. 

Thanks for most of that update, although I don’t know what ‘2 soaps 5’s in stereo mode’ means. 
 

First thing I’d do is unplug all the Sonos devices from power. Also, unplug the TV from power. Reboot the router. Connect an Ethernet cable temporarily between the Arc and the router…it can be removed later, once we’ve got everything set up. In this order: plug in the TV, and check it for updates, and apply any you find. Then plug in the Sonos devices. Wait two minutes, then check in your controller on your mobile device for any updates, and apply them. See which devices are showing up in the controller. If they all aren’t there, you can’t add the surrounds, they should be added as separate ‘rooms’ first. However, I think everything should be showing up at this point, so you can ‘move’ them into surround and sub duty (technically, the Sub can’t be a separate room, it has to be added to the Arc directly, but the Era 300s need to be separate rooms first). 
 

Finally, make sure the toggle (if there is one, it may depend on your settings) for the radio/wifi on your Arc is turned on…it uses that connection to connect to both the Sub and surrounds. If you turn it off, they’ll need to be wired, and could suffer a slight delay.

If this doesn’t work, and you’re still getting these error messages, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here. I recommend that you talk to a person, getting past the Chatbot. 

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Thanks for the info. Like ​@Airgetlam said what are “2 soap 5’s?

What is also a little confusing is that you have had Sonos since 2014 per your profile (maybe longer). Given your lack of posts  regarding any issues until now with the Era 300’s what has changed about your network? Did you install new networking gear, change your ISP or something else?

Which?

Sonos Play 5 (gen1)

Sonos Play 5 (gen 2)

Sonos Five.

Are you running the old S1 software or the current version?

​@Brian_33 did you add the Eras to your existing system, or have you created a second system? 
 

Have you added both speakers, or only one of them?

Do you get the message after adding each Era, or only for one of them?

Have been able to add each of them to a new room - two rooms but not a single room with stereo pair? 

​@Brian_33 

As you can read there are a lot of unanswered questions that hopefully you can provide the answers. Otherwise any information we provide is pure speculation. Help us so we can help you.