Network cable laid - tester shows error?

I have laid a network cable in my house from the office to the nursery and connected to Cat6 network outlets. After a first test with a test device, all LEDs from 1-8 were lit on both sides. After installation in the can body and completion I have tested again. Since then, the 3rd LED is no longer lit. Have checked the cans again and even reconnected, but always missing the No. 3.

Can someone help me maybe? But I still came to the internet with my laptop.

You will not get the full speed you want. Contact 3 on your box should take a closer look may disconnect and reconnect. If necessary on both sides if it on one side, the problem can't be solved. It is commendable that you use a cable. Because that is also the right connection that you should use for something. In my house I have only cables and do not use Wi-Fi.

It is unlikely that the LED has failed in the meantime. It may be that the wire is broken on the 3 when inserting the box. If you have not used a LSA + tool to hang up, it may be that you have a wobbler in the appropriate clamp, that happened to me before.

Hi, thanks for the replies. I've already pulled a laying cable, from one room over the attic to another. And then used by the can of patch cords. The patchcords work. The tester lights up all 8 LEDs one after the other.

Also, I disconnected the cable again, cut off pieces and clamped on the new and changed from right to left connection. But it stays that way - No. 3 does not shine.

Can it only then on the cable, right? Have already considered if I get new cans.