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info Honeywell
Status Chime
The chime feature is activated and will alert you to the opening of protected doors and windows while the system is disarmed.
? What Causes This
Chime mode was activated using the CHIME key.
ⓘ What This Means
Press your security code plus the CHIME key to turn off chime mode if desired.
Source: page 10 of the official manual
From the manual
This error code appears in:
Honeywell Vista-20P Security System