I had to remove the main fuse as well as the battery lead to reset the system.
If there is a time delay for the resettable fuse to kick back in, I haven't found what it is (took 5 mins from removing the short to finding the method for resetting the syem).
What is the expected impact to the keypads as that is really where I saw the issue play out?
Could it be that the main board was actually running and just waiting to return to a normal state?
I will test this again today to ensure it is not just a misunderstanding of the system reaction.
A short circuit on 12V should cause the resettable fuse to open within a few seconds, provided a backup batery is connected. When the resettable fuse opens the 12V will not be available to keypads or other devices
The rest of the alarm will still operate
You do not need to remove the batery and fuse to reset the system
There is a reset button on the Comfort PCB
You can also send the reset command from Comfigurator
Many thanks for your help
I haven't managed to reproduce the problem since and shorting the power supplies has not reproduced my previous experience.
With the knowledge of how the system should behave, I will just await a repeat event and test appropriately.