Thanks for getting in touch @matthewj
It looks like your router is trying to connect with an incorrect password which is why you're unable to get online.
Can you try resetting the router using the pinhole on the back in the first instance?
If you're still having issues after that please follow the steps below
1) Go to 192.168.1.254 in your browser and enter 'admin' as the username and the routers serial number (starts with CP and needs to be entered all in capitals)
2) Click on where it says 'Internet' under Broadband Connection and then click 'Disconnect'
3)Change the username to 'email@example.com' and the password to your account password
4) Click connect
Let us know how you get on
If this post resolved your issue please click the 'This fixed my problem' button
| Matthew Wheeler|
Plusnet Help Team