netgear52 model r6120. third light of four is red.

[plemans]

You have the R1620?

Firmware on it? 

What modem/router is it connected to? 

3rd of 4 does tell us much. The manual goes over what each light is and means

https://www.netgear.com/support/product/R6120.aspx

[schumaku]

@plemans there are just for LEDs on this router - the 3rd is the Internet LED - and no indication in the user manual of what a non-green e.g. red LED should tell us 8-/