My Accenta G4 system has stopped working-help??

Hi I have an accenta G4 alarm and the keypad has had a problem. it will not allow me to enter my code. tried disconnecting power and reconnecting. it will not allow 9999 or 0123 engineer codes. just bleeps when you try and put in fourth number. when i walk past sensor it illuminates on panel and bleeps. cant set alarm. any ideas or do you think i need new keypad.?

accenta + keypad