On Nov 5, 4:50�pm, "Seamus J. Wilson" wrote:
Neighbor's house has five smoke alarms wired so that all go beep when one
has alarm.
Two of them, at the end of the alarm line, suddenly started beeping. �I
helped him replace the 9V battery in each but did not help. �He bought two
new ones and I replaced. �Did not fix.
Disconnected the red alarm lead on the one at the end of the line and it
stopped beeping but had no effect on other beeper.
Is it possible that the other three need replacing??? �What is life of these
Firex smoke detectors?
The house is six years old in AZ.
Thank you for consideration,
Seamus J. Wilson

Take one of the non-beeping ones and put it where the beeping one is.
Does it beep? Now take the one that beeped and put it where the other
non-beeping was. Does it beep?

By doing this test, it should show you if the problem is in the wiring
or the detector.

Hank