Hi , We have an Accenta G3 burger alarm fitted , when we arm it & go to bed about 2 hours later the alarm goes off & when reset it shows zone 3 on the keypad , we have done the usual walk tests & cannot get zone 3 to show on the pad lights . We have 5 P.I.R's but only 1 &2 light up , but they all activate the alarm when tested . I have the manual but cannot find any troubleshooter items , could this problem be 3 is a code for low battery or anything like that , any help please ?