my second suggestion is then that alarm could have froze
power the alarm down by mains first then battery
power back up with battery first enter your code and see if it works again if it dosent leave the alarm switched off and you will have to see if you can get another number pad for it if it does work enter your code switch the mains back on put the lid back on and press reset if it works your laughing
let me know if it works
thanks Death
Death, January 2010