First Alert FA120C - Manual (Page 25)

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TESTING THE SYSTEM
6. Follow the manufacturer's instructions to test all smoke detectors, to
ensure that all are functioning properly. The identification of each
detector should appear on the display when each is activated.
7. After all protection points have been checked and restored, there
should be no zone identification numbers displayed. If a problem is
experienced with any protection point (no confirming sounds,
no display), CALL FOR SERVICE IMMEDIATELY.
8. Turn off the Test mode by entering the security code and pressing the
OFF key.