!!
critical Garrison
Error Code Red LED flashes every 30 seconds, one quick beep every 30 seconds
Indicates the unit is in an error condition.
? What Causes This
Internal fault or malfunction detected by the unit.
✓ How to Fix It
Replace the CO alarm immediately. The unit will not respond to CO while in this state.
Source: page 13 of the official manual
From the manual
This error code appears in:
Garrison 043 6119 2