Originally Posted by Terry Pinnell

British Gas sold me one of those battery-operated carbon monoxide
alarms a couple of years ago. Battery is apparently not due for
replacement until 2012. But can someone please remind me:

1) What the Test button should do? Here it just illuminates a green
'Power' LED, but I'm wondering if it should also sound the alarm (as
is the case with smoke detectors)? The instructions on the back merely
say 'Use the Test button to check that the unit is working correctly'
- which is not very helpful!

2) How I could test it in practice? IOW, what is a safe temporary
source of CO that should trigger it? I tried both an unlit gas ring
and the boiler vent outside the kitchen, but neither triggered it. I
suppose a predictable source would be the exhaust from my car?

--
Terry, East Grinstead, UK