Alarm working or not, it's your responsibility as a tenant to buy contents insurance, your landlord only has to safeguard his property with building insurance.
If you damage the system in anyway ,you maybe expected to pay for the repair ,or a proportional cost for all or such damage to existing fixtures or fittings being debited from your bond.
Read your tenancy agreement,
Your landlord presumably gave you the user code for the system,this means the system is fully functional, your landlord is only obliged to give you this, and in return he must ensure the system is fully operational, and maintain as and when required.
You have changed user code for one of your own codes, that's ok as all previous codes are stored
Ktm, July 2012