Hi both, just a brief update....The 83/4 shock reset worked a treat and I can now set the alarm! Thank you so much for all your help and guidance.
(Just to understand, when I set the alarm the display on the keypad briefly flashes 'Zone 5 open' but it then sets and all appears to be working fine - is the fact that it flashes 'Zone 5 open' normal procedure? As a reminder, Zone 5 is the shock sensor).
Hi Sparkymarka, many thanks for confirming. Sounds like it's all working the way it's supposed to! (I've also carried out a walk test and purposefully triggered the alarm and all seems to be working fine).