| Green LED | Red LED | Piezoelectric Horn |
Power Up | Blinks every 5 sec | Blinks every 5 sec | Off |
Normal (standby) | Blinks every 10 sec | Off | Off |
Out of Sensitivity | Off | Blinks every 5 sec | Off |
Freeze Trouble | Off | Blinks every 10 sec | Off |
Smoke Alarm | Blinks every 5 sec | Blinks every 1 sec | Temporal Pattern |
Thermal Alarm | Blinks every 5 sec | Blinks every 4 sec | Temporal Pattern |
Low Battery | Off | Blinks every 45 sec | Chirp every 45 sec after LED blinks for 7 days |