Originally Posted by billdomb
Some weird stuff with our CO monitors going off recently.
We'd put a blower into our lazarette where our gennies sit, and all of a sudden started having the CO monitor start blaring
You have a serious problem on your hands not related to malfunctioning sensors. If I'm wrong I'll gladly eat my hat and roll in the end result with pictures if you like. Please do not listen to people who give you advice to replace your sensors to "see what will happen."
You made a change that produced a result of two different alarms screaming. To suggest that two separate sensors just decided to "expire" concurrent with the ventilation change is sort of ludicrous and about as inconsiderate of advice to give under the circumstances as possible.
On my boat
...if I pumped it full of carbon monoxide...I can imagine so many pockets of air here/there (aptly named dead space) that could contain CO to keep the CO sensors going off for a while. You need to understand that carbon monoxide...any amount...steals oxygen from your tissues.
I would highly recommend, if possible, turning off all electricals (disconnecting all power sources), turn off all fuel
selectors, certainly don't run anything. Open all vents, electric
blowers (connected to shore electricity not through the boat) for a day or so. As previously mentioned, call the fire department to come out with a CO sniffer.
If a CO sniffer is not available...after airing out the boat
for a day or so, with the alarms not going off but operating, go back down and inspect the living sh!t out of all
Don't stop when you find the problem (unless clearly a gaping hole/crack situation). Inspect everything. In radiology there is a problem often called the "happy eye syndrome" (an observation bias) that occurs when the radiologist finds a big ~thingy that was not the actual problem and stops looking further. The thingy gets treatment (often unnecessary in the first place) while the real bad guy is still free to cause problems. This is why one must be comprehensive (at least when the result of missing the problem can cause serious injury or worse).