How can I reset my alarm?

Could someone please help. I had my alarm off for a while due to needing a battery changed. I have changed it now but there is a constant error message of 'Zone Open'. Then it says 'Z08', which there isn't one. It should only be programmed to Zone 1-4. It's a SCANTRONIC 9651system. Can anyone help, please? I have tried to reset it but nothing is working for me.