Step -

  1. Press P then existing master code then E
  2. Press Button 1 (11 for Pro series, L8, D8/16) then E
  3. Enter new Code then E
  4. Re-Enter new code then E
  5. Press P then E

NB: P is Labeled PROG on a NESS 5000. Do not press the Programme on the 5000 model, it dose not do anything!!

The Manual that explains all the details is available for most panels on the NESS web site. Most important point is you can't start your code with a zero(0)

If you do not have the master code you will not be able to change the code. Call for service if this is the case.