critical Honeywell

Error Code ALARM

An intrusion has been detected and the system is armed, or a fire alarm or audible emergency alarm has occurred.

? What Causes This

Intrusion detected on an armed burglary zone, fire detected, or emergency alarm activated.

✓ How to Fix It

Disarm the system using your security code plus the OFF key. Investigate the cause of the alarm. If fire or smoke is present, evacuate immediately and contact the fire department.

Source: page 10 of the official manual

From the manual

This error code appears in:

Honeywell Vista-20P Security System