Q: What is that beeping?
A: Could be either your carbon monoxide (CO) or propane detector, see which one it is first. They beep usually for 3 different reasons:
1: Either propane or CO carbon monoxide is detected, meaning they truly sense an issue.
2: Most of them run on 12VDC and battery is low and will set it off.
3. It is due to be replaced, they have a 3-5 yrs lifespan..
Additionally, farts (dog or human) can set the propane detector also.