!!
critical Garrison
Error Code Red LED constantly on, constant alarm
Indicates very low batteries or unit malfunction. The CO alarm is not functioning.
? What Causes This
Very low battery levels or major system failure detected by the unit.
✓ How to Fix It
Replace the CO alarm immediately.
Source: page 13 of the official manual
From the manual
This error code appears in:
Garrison 043 6119 2