I have 7 smoke detectors hard wired together, and I put in new batteries a
few months ago. Just today I started to get a "chirp" about once a minute.
I have a question..... if one battery is dead, do they all chirp? Or only
the one that is dead? I hate to run out and buy 7 batteries.
I swear they are ALL chirping, but they are throughout the whole house, so
it's hard to tell.
They are wired to the house current, (in series(?)), as they have been
required for many years, in the US. Each one also has a battery back-up.
What's the difficulty in figuring that out? No sarcasim intended.
They need to operate within parameters laid down in alarm manual regards
the RH [Relative Humidity] & min/max temperatures.
Look at the manuals on this site; they are UK 230 Volts, but
RH/temperature limits are same as for US models to UL 217 Standard.
Temperatures are in celcius & farenheit you'll be glad to hear!!
Go to Manuals.
They are in pdf format.
If moisture is the problem you may need to consider Heat Alarm
which is designed for such environments eg Kitchens/Boiler Rooms/Drying Rooms etc
Goes off when temp reaches 132deg F[57 c]
My house came with two smoke detectors installed. They each had a wire that
had not been used that was tagged as for use in connecting all detectors
It seems that if installed during initial construction it is possible to
have all detectors sound the alarm if any one goes off. This would be a good
thing in a large or multistory house where some detectors are far away from,
for instance, sleeping quarters.
In my situation, a single story structure, I can see where that feature is
less likely to be needed.
Don't know. NFPA 72, which details fire alarm systems, is updated every
three years. My house was built in '99, most likely under the '96 code, and
not only are the detectors interconnected, but, as required, they are also
in each bedroom.
I may have been a little quick on the gun when I said the inspector blew it,
because these codes, along with other building codes, have to be adopted by
the governing agency (town, city, state, whatever).
It probably _is_ a battery. I have 4 "hard wired" units in my home,
all have a 9V battery in case of an AC failure.
When a battery gets low, I get a low volume chirp at approximately one
minute intervals. If I don't change the battery in a reasonable
amount of time, the chirps get louder. When one goes bad, I break
down and change all four, as the others usually aren't far behind.
I would not call an electrician or alarm tech until I had changed all
The same thing happened to us in our vacation rental. Each level had a set of
interconnected smoke alarms.
The lower level circuit was beeping. I changed out all the batteries, no sale.
While waiting for the service guy I simply disconnected all the interconnects.
One head was bad.
Change out all the batteries first, but I think you'll find "Detector" is
right. If you can find one, buy a new alarm of the same make/model and and
swap it out with each of the existing alarms to find out which one is bad.
When they're wire
Try BJs or Sam's Club. They have good Duracell or Energizer batteries. Well
worth the safety. Put a sticker on each of the batts, and write on the
Even myself, used to be a volunteer fireman, I'm amazed how seldom I change
my smoke detector batteries.
It could be just one battery (some are already down when you
buy them). Unless you have had lots of power outages, your
back up batteries should last a long time. Duracell or
Energizer batteries will last for 2-3 years depending on the
detector even in straight battery operated smoke detectors.
If you have a voltmeter check each battery and if the
voltage is significantly down, replace it (the last 9 volt
battery I changed when it started to beep read 7 volts).
If you don't have a voltmeter, buy 1 new battery and replace
it sequentially in each detector and monitor for 4-5 minutes
for a beep before moving on to the next detector. You might
get lucky and find the bad battery on the first dectector.
As other's have suggested, it may actually be a detector,
but check the batteries first.
We have several smoke detectors, and when one of them started beeping due to
low battery it was difficult to figure out which one it was, in part because
of my poor hearing. I finally made up a long tube from stiff paper, held
it up to my ear and pointed it at each alarm. It was easy to tell which one
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