www.iFourWinns.com

When my CO2 detectors go off in the cabin after a long trip they stay on beeping for almost an hour after I am sure the cabin is clear of CO2. I was travelling from NY hudson river to Pt. Pleasant. about a 2.5 hr trip. After about 2 hours the CO2 detectors started to go off. I opened the ports on the deck and had tons of fresh air pouring in. It was blowing directly on the CO2 detector in the front berth and the detector continued to beep for almost an hour after that. We were under way the whole time. It finally stopped beeping after we had been running slow for about 30 min. I know these are an important safety feature but does anyone know why they keep beeping for so long after the cabin air is cleared??

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2008.Fourwinns V358
1999 SeaRay340 Sundancer
1989 SeaRay 260 Cuddy

The unit should have a test/silence button.

This is from the units manual (assuming you have a Fireboy-Xintex Carbon Monoxide Detector):

UNIT IN ALARM: If a unit goes into alarm, the first action is to get to fresh air and ventilate the boat. If no source of CO is found and it is believed that the unit is false alarming, unplug the unit for 20 seconds and reapply power. If upon reapplication of power the unit goes directly into alarm , then the sensor has been contaminated. If the unit alarms again after a time frame and it is guaranteed that there is no CO, then the unit has a slight amount of contamination that may burn off with time.
UNIT LOW VOLTAGE ALARMING: The unit will go into a low voltage alarm when the unit reaches a voltage of 10.2 volts (voltage may vary slightly between units). If the voltage drops just for a few seconds due to another device putting draw on the battery, then the unit can go into a low voltage alarm, but should return to normal operation when the voltage restores.

CAUTION! This device may be triggered by any number of hydrocarbons at very high levels. While these may be considered “nuisance” alarms, ALL ALARMS SHOULD BE TREATED AS ACTUAL CARBON MONOXIDE CONDITIONS.

You can also send the unit(s) back to the factory for calibration/test. I think the charge is $25.00 per unit plus S&H.

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2002 Vista 298 VP 5.0Gxi

I have had mine alarm just sitting in back yard. I just unplugged for a min. and all was well. I need to look into sending back for recal.

The only time mine has gone off because of CO, we opened all hatches and aired out, alarm shut off within a couple min.
If I had to listen to one of those for more than a few mins, I would go crazy!!

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2000 248 5.7L DP
'92, '94 SXI 750, '08 STX 15F, '12 Ultra LX 300
Videos

Mine went off on the weekend pulling out of my slip at dead slow speed after the engines had been idling for about 3 or 4 mins. We opened up all the port holes and the alarms went off after about 2 or 3 mins. Good to know they are working!

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"Kokomo"
2006 Four Winns Vista 318

I unplugged mine and plugged it back in and it was fine after.

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2001 Sundowner 235

The only time mine have gone off was when one of my battery charger breakers popped and we drained the battery down. When power was restored the detectors reset. One suggestion is to get another battery operated/portable unit to have as a back up. If that does not go off when the others do then you know you have another issue. We sleep much better knowing we have back up capability.

Any other issues with your 358? Have you gotten your galvonic isolators fixed?

Steven

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2008 Four Winns V358 (T 6.2L Merc Bravo III's with DTS and SeaCore)
2006 Sea Ray 340DA
2006 Sea Ray 320DA
2005 Maxum 3100 SE

I searched the web and found this:

http://www.fireboy-xintex.com/manuals/C ... ooting.pdf

I emailed this to fireboy-xintex and got this response:

My email minus personal information:
We guessed that new boat smell may have caused false alarms. Since then we have tried to air out the cabin and yet we still get false alarms every time we connect the detectors. Usually the unit will run for about 3-4 hours then alarm. We brought a battery powered CO detector with digital display from our home. It never shows any CO. I read on your website about a 72 hour cleaning cycle, how do I do this? Do I have to allow the unit to run with the alarm sounding for 72 hours? Will the units be safe after this cleaning cycle?

Their response:

The out gassing of a new boat can be a cause of nuisance alarms. yes, the Co must be active for 72hrs for the sensor to clean itself of contaminants and it will be fully functional after it is complete.

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2008 V358 Two-tone Blue V/P Dual Prop 320 HP
Lake Winnipesaukee, NH