Fearghal

I have just recently moved into a new house with a Aritech cs350 alarm system installed. The landlord does not know the code(s) to the system. It's also flashing "low battery". Can anyone suggest how I could reset the code for the system so that I can use it myself? Is there a helpdesk or something I can call? Also if the battery dies will the alarm start going off? I won't have the code to stop this if it does! Thanks