@Sunshine Thanks. I had already tried those suggestions. The range extender was about 3 metres from the router. The power LED was on. The router is a Linksys Community 11401, model number WHW03CFv2.

I switched my ISP from Virgin to Community Fibre. I reset the RE450. The RE450 found the Community Fibre networks fine. I entered the passwords for those networks. The RE450 does not connect to them,...