A ….It’s not a Honeywell system ….it’s either a euro 46 with wireless expander or enforcer with a keypad ….
B….the battery is probably flat in the hall sensor
If it’s pre v2.02 then it can’t be upgraded anymore ( that’s if it wasn’t upgraded originally ) texecom was swopping out the units a few years ago but I doubt they will now …
What software version is your panel ?
Press menu 4 on keypad …
Battery faulty ? , it’s an old panel from late 1980s , there are no fuses , poly switches.. so a short on ….eg bellbox due to water can make it go off …
It just unplugs ….it wont lose any settings if you power it down to swop out the piezo apart from time and date …if it’s connected to the cloud then it will update automatically
Post picture of what you are replacing …