!
error Honeywell
Error Code Rapid beeping
A trouble condition exists, memory of alarm is present, system low battery detected, external sounder wiring failure, or last 10 seconds of exit delay is active.
? What Causes This
System fault, previous alarm memory, low system battery, external sounder failure, or end of exit delay period.
✓ How to Fix It
Press READY key to display faults. Address the displayed fault. If low battery, contact your installer. If external sounder wiring fail is shown, contact your service provider.
Source: page 50 of the official manual
From the manual
This error code appears in:
Honeywell Vista-20P Security System