Colbyt wrote:
"Seamus J. wrote in message
...
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


They are rated for 10 year life. Environmental conditions can shorten that.

Smoking or dusty environment.

There is a recall out for some units:
http://www.firexsafety.com/recalldoc...uilderfaq.html

If you were able to replace the unit without changing the harness you got an
older one because Kiddie bought them out and the new harness does not match
the old one.


Hi,
7 to 10 years. I think ones beeping might not be the culprit.
Up stream in the chain one bad guy could be causing it. Disconnect all
sensing line and start reconnecting one by one and see which one is
causing it.