hello charlie, the panel should be showing 'day' and 'power'. If so;
1. press 'prog'
2. within 10 secs of pressing prog, key in existing code (4digits)
3. the tamper and power led's are now lit
4. press '8' (zones 1-4 & attack are now lit also)
5. key in new 4 digit code (and remember it !!)
6. press 'reset' 'reset'.
7. enter new code and check it is accepted, if so, job done.
mike, January 2008