and several resets outside and it went silent and reading zero.

I think I should get a new CO detector. It's manufacture date is 2011 usable to 2019 but it isn't behaving.
It has been silent, and showing zero with a green function light, on its display so I have assumed that it is reading a zero CO.
I pressed the 'test' button, as recommended, and it beeped once.
Then it alarmed reading 271ppm!![]()
OK! Opened the windows, left the room with the alarm trying to silence it, put it out of an open window and after several more alarm activations it went back to zero.
I returned to the room and the detector continued to read zero. Ok, so maybe the air is clear.
Pressed the test button again and it beeped once and then alarmed reading 271ppm! Moreand several resets outside and it went silent and reading zero.
Left it a while and then went to my GP appointment, leaving the windows open.
I returned to a freezing cold room and the detector still displayed zero. I pressed the test button and it beeped once, then it alarmed again reading 271ppm.
I waved it out the window and reset it again. Brought it back in and it reads zero.
I put it outside and pressed the test button. As above it beeped once and then alarmed at 271ppm.
I reset it and brought it back inside where it still sits next to the boiler reading zero.
OK, I can't trust it now.![]()
I burn coal. Surely I don't need one for that? My house is well ventilated judging by the draughts that come through the windows and front door at least.
Done that.can I suggest you read the instructions - it may be that the test function fakes a reading of 271ppm to force an alarm!



Ha ha ha ha ha ha ha ha
Edit: Hmmmmmm, right at the end of the instructions there is an addition for the model I have that says the test response is as I have experienced!
Just tried it again and it is choosing a random reading of 219ppm now for each test!
Ok, as you were, nothing to see here.![]()

Too true! I thought I had caught a flu bug, and just sat in front of my dodgy fire getting more and more poorly as the days went by. The CO poisoning turned my mind to mush. I was thinking so slowly that I didn't actually realise what was going on until I woke up after blacking out.For most people, the symptoms of CO poisoning are very similar to flu.
Best not to ask me how I know this.


Ah - I've just been reminded of why I hated having it in my other bedroom - a bright green led flashes once or twice a minute to show that it is working and that used to wake me up when I was having problems sleeping. Bit of duct tape soon sorted that out!![]()

At least you tested it - this thread prompted me to go and check mine .... and realise that I don't know where it should be positioned and what the actual warning thing is etc. (It's a Fire Angel? and a green and red light went on and off and it beeped).Ok, as you were, nothing to see here.![]()
I've been sleeping a lot since I got ill but normally I'm a light sleeper, and when I'm stressed, a borderline insomniac. It's why I drank so much beer!Blimey it would need to sprout a large mallet and beat me repeatedly over the head to wake me up![]()