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Posted: 12/31/2005 7:59:19 AM EDT
... every night between 2:00 a.m. and 4:00 a.m.? They're hard-wired.
Link Posted: 12/31/2005 7:59:40 AM EDT
pvt. rootbeer is smoking dope
Link Posted: 12/31/2005 8:00:17 AM EDT

Originally Posted By TheRedHorseman:
pvt. rootbeer is smoking dope





He's into your stash, man!
Link Posted: 12/31/2005 8:00:29 AM EDT
Have kids? see above
Link Posted: 12/31/2005 8:02:39 AM EDT

Originally Posted By TheRedHorseman:
pvt. rootbeer is smoking dope

Link Posted: 12/31/2005 8:03:21 AM EDT
Voltage spike maybe?
Link Posted: 12/31/2005 8:03:37 AM EDT
Backup Batteries may be toast. Also voltage surges can do that. ET
Link Posted: 12/31/2005 8:09:13 AM EDT
I don't think they even have backup batteries. And I can't think of why there'd be a surge every 24 hours at about the same time.

Pvt. Root Beer has been disciplined just in case he was the reason...
Link Posted: 12/31/2005 8:13:40 AM EDT
I had the same thing... not continuous operation, but periodic beeping in the night. It was the backup batteries (yes, there almost certainly are some, even though the detectors are hard wired).
Link Posted: 12/31/2005 8:24:06 AM EDT
Backup heat causing a rapid increase in ambient temprature.
Link Posted: 12/31/2005 8:30:11 AM EDT
Try another one. They are not expensive. Sometimes older units get more sensitive.
Link Posted: 12/31/2005 8:32:50 AM EDT
It's not mine, it's the couple's down the road. I'll pass on this info and post whatever they figure out. Thanks.
Link Posted: 12/31/2005 8:48:25 AM EDT
Blow them out with some compressed air. The kind used to clean off PC boards.
If over ten years old replace.
By code thay are supposed to be tested for sensitivity and if off sent to manufacturer
to be calibrated.

That is cost prohibitive.

Replace them
Link Posted: 12/31/2005 8:48:31 AM EDT
Mine did the same thing.All hard wired,interconnected,and no battery backup.I replaced them all.Also,have batt units,in case power lost during electrical fire,etc
Link Posted: 12/31/2005 8:50:51 AM EDT
Do they "go off" or just start beeping? If it is just beeping it probably is a low backup battery as others have said. They probably have their thermostat set so that the house is colder at night, and a low battery could be falling below the required voltage and causing the beeps only when it gets too cold.

It wouldn't hurt to have them check to make sure the smoke alarm curcuit is not wired to a light switch that is turned off at night.

Link Posted: 12/31/2005 8:57:06 AM EDT
smoke will make smoke alarms go off h.gif
Link Posted: 12/31/2005 9:07:04 AM EDT

Originally Posted By BigHunter27:
smoke will make smoke alarms go off



We have a winner!!
Link Posted: 12/31/2005 10:24:23 AM EDT
[Last Edit: 12/31/2005 10:27:43 AM EDT by NCFFEMTERT]
Rate of rise detectors generally wont activate with a few degree change. Sort of depends on what kind of units they are...photoelectric eye, ionization and so on...before a "reason" could be narrowed down...other than the battery charge indication. Activating and battery alarms shouldnt be the same alert.

They go off for the same reason the ones at hospitals go off at 3am.....they just do.
Link Posted: 12/31/2005 10:33:04 AM EDT

Originally Posted By NCFFEMTERT:

They go off for the same reason the ones at hospitals go off at 3am.....they just do.



I lived in an apartment complex where they went off every couple nights for a week. The FD arrived every time, since it was hard-wired. Speculation was that there was a short due to rain or defective wires.

One night at 3am, however, I remember being one of 20-30 angry grad students who had to evac. There was one there that smelled kinda funny, looked hungry, and really didn't care about the fuss. We suspected he'd been sparking up and setting the detectors off.
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