i have a 9448 alarm , we recently had the walls replastered so i unscrewed the censors, the tamper alarm went off so i entered my code which turned it off, since then ive screwed them back but when i set it , it wont stop beeping so i just have to re enter my code to stop it hense i cant use it anymore, can anyone help ?

Double check that all the lids are back on tightly, too. If you can't see the problem then ,like Peter said, give your installer a call. They will be able to trace the fault quite easily.

Are the LEDs coming on the PIRs, it sounds like you might have blown a fuse. The 9448 usually wont Reset when you have a tamper problem and gives a single beep, check what LEDs are lit on your keypad.