Zimmerphrame-

OP isn't a pro, I would'nt recomend anyone fit a fused spur unless they are actually qualified to do it... 3 pin plug just requires you to be competent enough to wire a 3 pin plug...

only safe system is a closed system... plus, the smarter technology is, the more likely it'll mess up...

from what a remember, scanny 9800 doesn't have an onboard buzzer..... i get this all the time... best thing is to shut all doors in house, walk around to see where noise loudest...due to frequency of beeps, it can throw its location around a bit... could be something in cupboard with scanny panel...but if you downpower the panel and leave it a while, and you still get chirrping, it definately is not the panel..

a thief can use a booster, to boost signal for keys, where ever they are in the house..

Ooooo not had good experiances with visonic stuff personally... problem with non-sub app is a possible lack of security... security features on an app costs money- what with secure servers etc.. no manafacturer will give that away for free..

install pyronix enforcer in a cupboard, plug it in using a 3 pin plug. fit the wireless sab outside, wherever is easiest, remember that you will need to get back up to the bell every year or two(dependant on single/dual frequency) to replace battery. add wireless arming stations and detection devices to suit.. current enforcers have wifi built in, so you can access cloud via home wifi and pyronix cloud app. (recomend a UPS for the wifi router in ccase of power cut..). i personally prefer a pyronix 46 and wireless zem setup...

can be a dodgy transformer or high resistance short...you'd need to check the voltage across 12v/0v aux.. try disconnecting all the 12v/0v terminals and checking 12v/0v aux voltages again, if it goes back to the normal 13.5-ishV, then its likely something wired in causing the issue. add a pair of 12v/0v at a time to see if values change..

The enforcer is not designed to use 4 zems for wired circuits.... 4 zems with wired circuits on a standard wired castle panel would normally require additional power supplies as well! It even states in the install manual, on page 50 that hardwired inputs require an additional power supply...