Go outside and zero out your meter and go back inside and place it next to the plugged in meter might be zero there instead of right on top of the heat.
Carbon monoxide detectors have to conform to UL 2075. It defines detection curves in terms of concentrations and time. It also defines where the nuisance cutoff is. That meter knows there is CO there, but it's below that threshold. It won't show anything other than 0 until it hits a minimum ppm number by design. Because it has to.
1:33 levels would be off the chart in District of Columbia near Capital Hill and the White house. carbon monoxide and methane.
Go outside and zero out your meter and go back inside and place it next to the plugged in meter might be zero there instead of right on top of the heat.
Carbon monoxide detectors have to conform to UL 2075. It defines detection curves in terms of concentrations and time. It also defines where the nuisance cutoff is. That meter knows there is CO there, but it's below that threshold. It won't show anything other than 0 until it hits a minimum ppm number by design. Because it has to.