CO detector beeping

They also beep when they've aged out. If it's around 5 y/o or more, it's died of old age.
Some also flash the LED orange when they're aged out.

Gundog wrote:
The coach is in storage and not in use but I keep hearing a faint beep I removed it thinking it needed a new battery but it is hard wired. The coach is plugged in and there is nothing running that should trigger the alarm I am guessing it has gone bad. I need to get it fixed we will be using the coach staring the 22nd of this month. The existing detector is a Costar brand.

Should I get another one that is hard wired or a battery operated model?

Mine is hard-wired, and beeps when the house battery voltage drops to ~11.5V or so.

I got a new unit thinking perhaps the old one was expired, and on my next trip planned to replace it. However, during that trip, my house battery never went below 12V so I deferred.

Gundog wrote:

For a replacement does it have to be an RV type they are much more expensive. I like the idea of it having its own battery and not rely on the house batteries.

In my opinion, it does not need to be an RV-specific unit. I replaced mine with a dual-function household battery-operated smoke/CO detector (same with the original smoke detector at the other end of the motorhome). The household ones that I got at least do not work properly in very cold conditions, so I have to remove the batteries during the winter when the RV is in storage lest they go off continually. I don't think that's a significant safety hazard in as much as I would not be using or sleeping in the RV when it's below zero inside it.

My house batteries are bad and I plan to change them out this spring our upcoming trip has full hookups so I won't be on battery power. I will look to see if the house batteries are charging we had a power loss the other day and it may have tripped the charge circuit off. There is a button on the inverter that turns battery charging on and off so it maybe off after the power outage. The detector is just hanging from the ceiling right now because they did not leave enough wire to unplug it if I change it out I will need to cut the 3 wires and splice on a new detector. I will look for a date on it but I think it is original equipment and this is a 2005 so it probably needs changing. I have an LP detector also but it is down close to the floor.

For a replacement does it have to be an RV type they are much more expensive. I like the idea of it having its own battery and not rely on the house batteries.

Regarding the expiration date. I've had MH's where the detector is original equipment and never replaced them due to expiration date and they functioned just fine. IMHO its cya from the company.

When they beep it almost always is a low voltage from the house battery.

And your house battery doesn't need to be dead either. Even a slight drop will set the alert beeper off. I think its a great alert for when my batteries/converter are getting tired. The last time mine started beeping it was found that the converter had a problem. :C

On my coach I had to remove the CO detector to read the expiration date which was stamped on the back side. I would replace it with another hard wired unit.

When you pulled it did you check the expiration date on the detector? There should be a date tag on the unit. CO detectors have to be replaced after a number of years. I believe most expire after 6 years. If expired just order another and hard wire it in. I replaced my 2010 TT I bought in 2017. I wasn't beeping but I pulled it to access wiring behind it and saw the expire tag. I replaced my CO detector with a combination CO/propane unit.

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Some beep when your house batteries are low.