Lads read the manual there is no engineer reset for tamper on this model.
It looks like it is stuck in between engineering and user. The clue is the locked keypad.
OP, take off the cover and enter 9999 see what happens.
Check all tamer circuits ( Just the global one is all from what you say. Refit cover and press reset reset, then your code and reset.
Should clam the thing down.
Alarm
July 2012