!!
critical Garrison
Error Code Red LED flashes two times every 30 seconds with two quick beeps every 30 seconds
Indicates the end of unit life.
? What Causes This
The lifetime of the CO alarm has reached the limit, typically after ten years from initial installation.
✓ How to Fix It
Replace the CO alarm with a new model to ensure continued protection against carbon monoxide exposure.
Source: page 13 of the official manual
From the manual
This error code appears in:
Garrison 043 6119 2