Did you check the date on it?. Mine was 3 years out of date when the batteries went flat. It was only when I changed the batteries I realised the detector actually had a date on it as well. Cheers
British gas Carbon monoxide detector needs new battery's
Hi, I had one of these from British Gas, I thought they are useless once batteries run out, a guy from PH Jones Heating told me mine was no good as I had changed the batteries.