![Kidde Combo photoelectric smoke/C0 alarm going off every hour… will beep twice. Say fire twice. Beep again. Then stop. : r/firealarms Kidde Combo photoelectric smoke/C0 alarm going off every hour… will beep twice. Say fire twice. Beep again. Then stop. : r/firealarms](https://preview.redd.it/kidde-combo-photoelectric-smoke-c0-alarm-going-off-every-v0-p3dtirm3z3z91.jpg?width=640&crop=smart&auto=webp&s=c3b00bcd07aa636d0ca4b2ac0d74a625c0900ec7)
Kidde Combo photoelectric smoke/C0 alarm going off every hour… will beep twice. Say fire twice. Beep again. Then stop. : r/firealarms
![City Of Lynn Fire Dept. on Twitter: "Day 3 - #FirePreventionWeek "Learn the Sounds of Fire Safety" * Beeping - Three continuous beeps means there is a fire emergency. Four quick beeps City Of Lynn Fire Dept. on Twitter: "Day 3 - #FirePreventionWeek "Learn the Sounds of Fire Safety" * Beeping - Three continuous beeps means there is a fire emergency. Four quick beeps](https://pbs.twimg.com/media/FA777DoX0AIdaXY.jpg)
City Of Lynn Fire Dept. on Twitter: "Day 3 - #FirePreventionWeek "Learn the Sounds of Fire Safety" * Beeping - Three continuous beeps means there is a fire emergency. Four quick beeps
![Betsy Megas on Twitter: "I don't remember if this @FirstAlert smoke and CO alarm promised 5 or 10 years before self-destructing, but it woke us up with three beeps at 2:30am today, Betsy Megas on Twitter: "I don't remember if this @FirstAlert smoke and CO alarm promised 5 or 10 years before self-destructing, but it woke us up with three beeps at 2:30am today,](https://pbs.twimg.com/media/FJUve_lVEAY2nxY.jpg:large)
Betsy Megas on Twitter: "I don't remember if this @FirstAlert smoke and CO alarm promised 5 or 10 years before self-destructing, but it woke us up with three beeps at 2:30am today,
![City of Carlsbad on Twitter: "Do you know the difference between a smoke alarm and carbon monoxide alarm? 3️⃣short beeps means smoke or fire. 4️⃣short beeps means carbon monoxide is detected. Either City of Carlsbad on Twitter: "Do you know the difference between a smoke alarm and carbon monoxide alarm? 3️⃣short beeps means smoke or fire. 4️⃣short beeps means carbon monoxide is detected. Either](https://pbs.twimg.com/media/FBCc_TkWQAMLnWD.jpg:large)