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Old 10-20-2021, 09:13 PM   #1
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Help with Carbon Monoxide problem

I need help, I am at a loss. I have a class c motorhome. My co alarm kept going off, so I bought a new one, new one shows levels from 30-150ppm. I am hooked to shore power and I have no fuel burning (motor is off, propane tank is closed) Where could the CO be coming from??

When I pull outside air from the bathroom vent and push air out the stove fan, co levels fall to 0 within minutes.
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Old 10-20-2021, 09:30 PM   #2
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At exposure to 150 PPM CO symptoms of CO poisioning will start in 4 hours. You really need to do more than just ask IRV2 about this ! I would not reside in the motorhome untill you get this sorted out !

In most places if you call local fire they will send someone out with a CO test set who can confirm the presence and help locate the source.

You likely should NOT use 911 to call them, rather call their non-emergency #.

Good luck.
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Old 10-20-2021, 09:32 PM   #3
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Do check back and let us know you not only are still alive but what was the problem? When you know. . . .
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Old 10-20-2021, 09:39 PM   #4
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Yes I know levels that high are dangerous, I am able to keep my level at 0ppm, by circulating outside air. I have 2 separate co sensors/alarms for redundancy.

I just don't understand how co can be produced if nothing is burning. I have no fuel sources available. And my gas tester shows no fuel leaks.
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Old 10-20-2021, 09:49 PM   #5
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First, follow the advice of the others and don’t stay inside until this is resolved.

The unknown is, where are you parked, is any other camper close, and could smoke or methane be anywhere around you?
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Old 10-20-2021, 09:53 PM   #6
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Are you parked at a truck stop or rest area with other vehicles running nearby?
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Old 10-20-2021, 11:02 PM   #7
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In my research I've discovered that overcharging lead acid batteries can release hydrogen gas which will set off a co alarm. My house batteries show signs of over charging, so hoping this is the issue. I will follow up with y'all after further exploration.
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Old 10-20-2021, 11:11 PM   #8
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Here are some possibilities to look at:

https://chemistry.stackexchange.com/...ses-other-than

https://rvlifestyle.com/rvers-bigges...ide-poisoning/

Batteries leaking?

Does it go off when you're driving, also?

Gas stove? Gas hot water heater? Using the generator?

Don't stay in it. Get a good RV technician.
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Old 10-21-2021, 12:49 AM   #9
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As mentioned already...In our confined entry meters hydrogen sulfide and CO is the same sensor. The CO level will alarm very low because of cumulative build up in your blood. HS is twice as poisonous in higher acute exposures. HS is heavy and gathers more low ,CO spreads freely in air.
If batteries are gassing off don't start poking around until getting the storage area aired out . You check/found batteries maybe overheating. I wouldn't be surprised if you have a bad cell and charger is pushing too much voltage because of that.
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Old 10-21-2021, 04:53 AM   #10
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Gasses other than CO can set off the alarm, they just have to react the same as CO in the alarm. What have you changed near it? New carpet or pet bed, the dog start sleeping in a different area? Move the cat litter box? Spill anything?
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Old 10-21-2021, 01:02 PM   #11
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Quote:
Originally Posted by Argosy View Post
Gasses other than CO can set off the alarm, they just have to react the same as CO in the alarm. What have you changed near it? New carpet or pet bed, the dog start sleeping in a different area? Move the cat litter box? Spill anything?
I think you are conflating CO with LP (hydrogen) gas detection. CO detection is a rather unique procedure and false alarms rare.
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Old 10-21-2021, 03:35 PM   #12
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Quote:
Originally Posted by Gary RVRoamer View Post
I think you are conflating CO with LP (hydrogen) gas detection. CO detection is a rather unique procedure and false alarms rare.
You may wish to read the following:
https://www.fireengineering.com/fire...-co-detectors/


Interesting detail on how the detectors work, but the gist of the topic is false alarms. This part jumped out,


"...Interfering gases of similar molecular size and chemical reactivity may produce false positive response. Major interferents that can affect CO detectors are acetylene, dimethyl sulfide, ethyl alcohol, ethylene, hydrogen cyanide, hydrogen sulfide, isopropyl alcohol, mercaptan, methyl alcohol, propane, nitrogen dioxide, and sulfur dioxide."
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Old 10-22-2021, 11:59 PM   #13
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For anyone who was curious, I am still alive, and, after fixing a charging issue on my house batteries, my CO sensor has read 0ppm for 2 days.
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Old 10-23-2021, 12:12 AM   #14
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Quote:
Originally Posted by Jsweeney14 View Post
For anyone who was curious, I am still alive, and, after fixing a charging issue on my house batteries, my CO sensor has read 0ppm for 2 days.
Good for you.... on all aspects!
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