!!
critical Honeywell
Error Code Loud, continuous alarm
Burglary alarm or audible emergency alarm has been triggered.
? What Causes This
Intrusion detected on an armed burglary zone or emergency panic function activated.
✓ How to Fix It
Disarm the system using your security code plus the OFF key. If you are not the authorized person, leave the premises and contact police from a safe location.
Source: page 51 of the official manual
From the manual
This error code appears in:
Honeywell Vista-20P Security System