mains smoke alarm sounds intermittently

CamperMan

OK,

here is the problem, we have mains powered smoke detectors in the house and over the last couple of weeks, the alarm goes off in the early hours of the morning, about 2am to 4am maybe 3 or 4 times a week (annoying when your fast asleep :mad:), it is never during the day, always about the time I have stated, I have replaced the backup batteries, cleaned them etc and they still go off, any ideas?

Fighting Irish

CamperMan wrote: »

OK,

here is the problem, we have mains powered smoke detectors in the house and over the last couple of weeks, the alarm goes off in the early hours of the morning, about 2am to 4am maybe 3 or 4 times a week (annoying when your fast asleep :mad:), it is never during the day, always about the time I have stated, I have replaced the backup batteries, cleaned them etc and they still go off, any ideas?

dust?

CamperMan

Fighting Irish wrote: »

dust?

could be, but I do hoover them, maybe I will try it again

davelerave

do you know which alarm is activating

CamperMan

davelerave wrote: »

do you know which alarm is activating

I can't tell, they all go off (we have 4) at the same time.

davelerave

One of the detectors should be flashing red

mazthespark

could be batteries. all mains smoke alarms have a 9v battery for backup. if installed a few years should be changed neway. no harm to test them once in a while either by pushing the test button on them. hold for a few seconds and they should all ring

LeBash

This might sound laughable, but since youve hoovered the chambers and changed the batteries (with decent batteries i hope as the cheap 70c things do not output 9V after a few hours) check for a dead spider.

Open it up and hoover around the whole smoke alarm.

I found a tiny spider and the legs were touching 2 contacts on a PIR. It had me running around fault finding for days.

CamperMan

LeBash wrote: »

This might sound laughable, but since youve hoovered the chambers and changed the batteries (with decent batteries i hope as the cheap 70c things do not output 9V after a few hours) check for a dead spider.

Open it up and hoover around the whole smoke alarm.

I found a tiny spider and the legs were touching 2 contacts on a PIR. It had me running around fault finding for days.

the alarm that was going off was full of little flies :mad:

danjo

CamperMan wrote: »

the alarm that was going off was full of little flies :mad:

Fireflies obviously.