Ie mains powered smoke alarm- constant beeping

[Mandapanda]

Hi,
We have an ei 150 which has started beeping this am (been going for about 3.5hrs so far and driving me crazy!!) there has been no power cut, they are connected to the mains and have a green light and tere is no battery to replace according to the back of the alarm. We have tried holding the test/hush button for 10 seconds and it does nothing (except setting the actual alarm off!)

We have come to the conclusion they need to be replaced (we think they are about 11-12 years old) however, the problem is the beeping won't stop!!! We have turned the main power supply to them off, taken the units from the ceiling and switched them off at the dedicated plug, yet they still beep!! (It's like phoebe from friends' experience!!) how can I get them to be silent while we await the replacement ones. I am a nurse on night shifts so this beeping for a few days is NOT an option!!

Thanks for your help in advance!!

Amanda

 

[PrenticeBoyofDerry]

Try pressing in test button for 10 seconds.
If the green light is on, normally means the units cells are in good condition, if it still continues to bleep, try removing (isolate first) and give the unit and lens a bit of a clean.