Est 2 Multiple Alarms On Different Floors At The Same Time

I’m having an issue with the EST 2 panel. One smoke detector will go into alarm condition on one floor and then right after multiple floors go into alarm condition. The only smoke detectors are in the elevator lobbies. The panel won’t take a reset. When the I remove the detectors the panel still won’t take a reset and I have to reset the SLC for the alarm condition to clear. I have been troubleshooting but I’m all out of options. Wiring looks fine no shorts or grounds and I’m reading data on the loop.

Maybe is a general alarm system, how big a building

You get multiple heads in alarm or the A/V’s activate on all floors?

The EST2 has a myriad of issues and I always advise folks to just move on. An IO-1000 is cheap and atleast you can get support for that panel.