K1 error 2060

Hi,
I got a Used K1 from a Friend. The Printer was reset to Factory settings
After this, the Printer is unable to finish the first Selftest.
When the Printer starts the Bed Leveling, I got the 2060 Error Massage.
Solution:

  1. Unplug the nozzle terminal
  2. Replace the nozzle connection line
  3. Restart

But how? I change the complete nozzle without positive results, Maybe somebodey have the same Problem or a Idea to solve it.

Thank You