Barney H. wrote:

Is there anyone knowledgeable out there who can suggest how we can
shut this thing down ourselves?

On the off chance you *DO* have a CO problem you might want to get
another CO detector and try it out. We have several NightHawks and they
have a digital readout of the CO level. Just plug them in and see what
they say. Perhaps you can borrow one from a neighbor or friend?
--

-Bill