problem with my accenta g3 alarm it keeps bleeping every 5 mins?

does anyone know how to solve my problem, my accenta g3 alarm keeps bleeping every 5 mins, in the manual it states this is a warning it needs a service, does anyone know the code or something to solve this problem it is 13 months old and cant afford another service man to come out when everything else is in perfect working order.
it is coming from the keypad, at first i thought it was the smoke alarm, but defifinuatly the keypad.
please please help get rid of the annoying bleep.