⚠
warning Honeywell
Error Code One short beep (about every 30 seconds)
System is in test mode, low battery is detected at a transmitter, or system will autoarm within 10 minutes.
? What Causes This
Test mode is active, wireless sensor has low battery, or autoarm timer is running.
✓ How to Fix It
Exit test mode if active. Replace battery in low battery transmitter. Allow autoarm to complete or disarm system if needed.
Source: page 50 of the official manual
From the manual
This error code appears in:
Honeywell Vista-20P Security System