ransley wrote:
On Nov 5, 3:50 pm, "Seamus J. 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

Probably just dust or a bug, every few years I get one that false
alarms and I just use a can of compressed air, my detectors are over
20 yrs old and fine, I dont believe this sales gimmic that you need to
replace them every 10 years, but they should be blown out regularly.
Hmm,
20 year old? Are you testing it with what? Just test buton which is not
real test? Commercial testing is with real thing out of spray can.