Hi, Don't know if you got an answer to this but here goes:-
Press [PROG] then enter your current code. The Tamper (TA) LED comes on and the Day LED goes off.
Press the [8] button. LED's 1 and 2 are now on.
Assuming your user [1] press [1]
Enter your new [4 digit code]. If accepted it will double beep.
Press [RESET] twice to exit and this shoul dhave worked.
Ted, July 2009