can't dis-arm my sr100u sparkrite?

i've fitted a sparkrite alarm system, pretty staightforward. i've got a blue wire to ense an earth for the doors, pair of wires to break starter contact, one for the fan, two for indicatores and as well as +&-one to the ignition to sense voltage but i can't get the bugger to dis-arm, i've re-booted it to no avail. it beeps to say it's arming and dis-arming but it's lying it just keeps going off after 30 secs.
can anyone help, i'm going mad
Lee