Worrying Gas Alarm and now CO2 Alarm puzzle?

Joined
May 9, 2014
Posts
16
Likes collected
13
Location
Deb’n
Funster No
31,395
MH
Fiat Mirage 6000U
Exp
2011
Solve this, and we’re friends for life!

2006 Fiat Mirage 6000U ‘New Life’.

Last year went away locally, then after a few hours on EHU the hard wired Thitronik G.A.S-pro alarm goes off. No smell of LPG, turned Gaslow bottles off, cleared gas in pipes, alarm keeps going off so went home.
Next day found the 11kg bottle connection hand tight, tightened it up, check others and all ok.
Few weeks later went away again, and exactly the same occurrence, after the same amount of time set up (on EHU again), repeated actions with exactly the same result.

Took MH in for gas safety check, they found some pipe needed replacing underneath, the never used outside BBQ point wasn’t fully connected (may have been me installing isolator valve as permanently live when gas is on), but they found the 6kg Gaslow bottle was leaking from the neck, which the engineer had never seen in 20 years, and he rang Gaslow who said that doesn’t happen? Gaslow offered to exchange bottle on good will if I took it to them; a 400+mile 2 or 3 day trip with overnights which I declined and just bought new 6kg bottle. All fitted, pressure test done and all ok.

MH always sat on drive with gas off and I’m regularly in and out of it (pottering, tinkering and fettling of course) and never heard the gas alarm go off, plus used briefly for one night last month not on EHU and no problems.

Came away again locally (thankfully) on Tuesday on EHU, and after a few hours exactly the same problem occurs again!
Gas alarm going off, turned bottles off, cleared gas in pipes, alarm still going off. After 2 hours investigating and fault finding, checked cupboards and every pipe I could, tried EHU off and on but alarm still going off (getting desperate now), still no smell of gas, so disconnected the alarm from power and drove home in car we luckily had with us.

Next day another 2hrs crawling over and under vehicle, traced/checked power cables as YouTube said may be electrical fault or blown fuse, but nothing found, so reconnected alarm and still going off. Opened windows, doors, skylights and it didn’t go off which was good, but worryingly showed it must be gas setting it off, but it’s all turned off?
Then at 3:00pm the CO2 alarm goes off!!
Now really confused: bottles been off 24hrs, haven’t run engine, no gas smell, no gas used, no heating on, nothing cooked except in microwave, no curries, no candles, we don’t smoke, no pets (YouTube said their farts can set it off??). WT actual F is going on?
Phoned repairers for emergency check, but are snowed under until next week and holidaymakers caravan had a cooker fire, so they win anyway!
Opted to stay as organised friends gathering for the weekend and all coming tomorrow, so went home (again) and collected tent as really not happy sleeping in MH, also CO2 alarm nearly 5yrs old so bought a new one.
Worked out if skylights are open and drivers door wedged open about 1foot (chained up!) alarm didn’t go off, probably as gas alarm right by drivers door? Sited tent near door and went to sleep in tent.

06:30am gas alarm going off! Checked door still open, no gas smell, so disconnected alarm, got back in tent.
08:30am new CO2 alarm goes off!! Opened all doors, windows, vents and had breakfast outside.
Checked bottles are off (again) and gas levels don’t appear to have dropped at all.
Gas engineer friend who’s coming tomorrow anyway and bringing work van, so he’ll check it out, and if nothing else we’ll remove 11kg bottle as it’s probably same age as other ‘impossible to leak’ one in case it is that again, but totally baffled why CO2 alarm(s) going off without combustion?

Anyone have any ideas or sensible relevant to the problem suggestions or fixes (been on here 13 years and know the score) would be gratefully accepted. Thanks.
 
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A duff leisure battery that is gassing off hydrogen sulfide it will set off a CO alarm and probably a gas detector.
As it happens when you are on EHU I reckon your battery has had it. It probably getting hot when on charge if so disconnect it immediately an exploding battery is not much fun.
 
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Upvote 1
"
Gas sensors also respond to cylinder gas- or narcotic gas-like substances in certain concentrations. Therefore, technically speaking, there are no false alarms; it is just that possible causes are not linked to the device:
deodorants, aftershave, harsh cleaning agents, bodily gases (especially from our four-legged friends) or even alcohol on the breath or fondues can by all means cause a sensitive gas alarm to go off.
"

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Upvote 0
Thanks very much to all for the swift replies. I did visually check both batteries yesterday for that, and no smells or anything untoward? Just checked again and one is warm to the touch, so disconnected the EHU. This warm one is spookily directly under the CO (NOT CO2, sorry my bad) detector, which may explain that!

Would it be safer to leave the EHU off and go back onto gas, as batteries still receiving solar charge, or disconnect the warm one battery terminals (I will separate and isolate both) and stay on EHU?
 
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Diss the warm one as its still getting charged by solar.
If it goes bang you will have a hell of a mess with sulfuric acid everywhere.

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Battery now out and have ‘borrowed’ a Platinum Leisure Plus battery used for the anti-otter electric fences round the fishing lakes where I work which was luckily 10 minutes away!
Thanks to all for your help, Motorhomefun comes to the rescue yet again and never fails to impress me with the wealth of knowledge and experience people are more that willing to impart and share on here.
I now have a whole new load of BFF’s who I owe beers to. Happy trails.
 
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What did you do with your old gaslow bottle, a funster might be passing you and gaslow on a trip....might be able to at least get something towards a new battery 👍
 
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Motorhome repairers sent bottle back to Gaslow as they wanted to see it.
 
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