propane gas alarm on pop up tent trailer

The yellow alarm means replacing the unit. The gas sensing technology has a finite lifespan. Similarly with CO detectors and some smoke detectors, the technology of detection involves materials with a short effective life.

I wish you good luck in finding a suitable replacement, mnaufacturers keep changing models, get bought by competitors, go out of business.

Make sure your 12V electrical system is up to snuff, as low voltage power supply will suggest detector failure.

So, how old is the trailer? Yes they need replacing but I have one in my 2006 trailer that is still working.

Here are a couple of things to check. If the battery in the trailer gets low you would usually hear a chirping sound. This usually happens in the dead of night by the way. I remember during once such night the light was yellow.

My batteries were fine so I went online to a forum like this one and was told that sometimes these things accumulate dirt and dust and that can cause a problem. Mine had a "reset" or "check" button, or was it a "test" button? I pressed that and everything went back to normal. I was going to try to simply blow it out with compressed air if that didn't work. Since yours isn't making the chirping sound my guess is that you probably need a new one.

Good luck. Come back and share your solution here.

Yes, it runs on electricity...from your 12V system....not a battery that is in the alarm...

and...yes these units have a life span. Any that I have had have "chirped" when they need attention..

Maybe google the make and model and find the manual that will tell you exactly what the yellow light is indicating.