Signal toneRed LEDFunction / Meaning
No toneFlashes every 344 sec.Normal operating state, automatic self-test
Loud interval tone at intervals of 0.5 sec.Flashes every 0.5 sec.Alarm state
Short signal tone every 40
Battery change indicator, please renew detector
3 short signal tones every 40
Fault / contamination, please renew detector
No tone
Flashes every 10 sec.
Alarm mute
Loud interval toneFlashes every 0.5 sec. as long as the detector head is pressedFunction test