It needs maintaining if it's on your policy.
If you have no current service details and you suffer a loss then you insurance will try to dodge payment for any claim made by yourself.
Basically they can void your claim.
Get it on a service contract with an approved company or inform your insurance company that the system has been decommissioned and no longer used to safeguard your property.
Chances are your getting a reduced premium because of the alarm system and that's why you need to sort it either way.
e manno
June 2013