First Alert FA120C - Manual (Page 30)

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FIRE ALARM SYSTEM
IF INSTALLED
Silencing Fire Alarms 1. Silence the alarm by pressing the OFF key (security code not needed
to silence fire alarms). To clear the display, enter your code and press
the OFF key again (Memory of Alarm).
2. If the keypad does not indicate a READY condition after the second
OFF sequence, press the READY key to display the zone(s) that are
faulted. Be sure to check that smoke detectors are not responding to
smoke or heat producing objects in their vicinity. Should this be the
case, eliminate the source of heat or smoke.
3. If this does not remedy the problem, there may still be smoke in the
detector. Clear it by fanning the detector for about 30 seconds.
4. When the problem has been corrected, clear the display by entering
your code and pressing the OFF key.