Accent G3 tamper lockout?

Can anyone help, i've got a accenta g3 alarm and the other day i took one of the PIR sensors off the wall and set the tamper off, i put my 4 digit code in the key pad and silenced it, carried on with the job then fitted the PIR back up but when i went back to the key pad the tamper light was on but nothing would work, the chime still works when the door opens and the panic alarm works but after i reset it it goes back to the tamper light and nothing works, the fuses in the panel seem ok and the battery seems ok anyone got any ideas ?