I have a few pieces of equipment in the basement and one of them is beeping every 2 hours (approximately) or so.

1) Sump Pump

2) Radon Mitigation System.

3) Verizon Fios - Optical Network Terminal (ONT).

4) Furnace

5) Water heater

How do I identify which one is making the beeping sound?

  • 1
    often equipment will have a light indicating an error or low battery. My guess would be to check the sump pump, radon, and ONT as I don't believe the furnace or water heater will beep
    – depperm
    Mar 11 '20 at 15:22
  • sump pump doesn't have a battery backup.
    – abhi
    Mar 11 '20 at 15:46
  • 3
    Does this answer your question? what is beeping in my house?
    – Ecnerwal
    Mar 11 '20 at 16:03

It's almost certainly your FiOS ONT. The power supply contains a battery, and it beeps when the battery dies. You can take the battery to a hardware store and buy a replacement for a couple of dollars, or call FiOS and they will send you a battery.

Those other deices you listed usually don't beep, except for the sump pump if it's got a water level alarm or a battery backup, but usually the water level alarm is constant. It may have indicator lights to tell you what's wrong.

  • Now that you mention it, the alarm beeps every 1 minute according to the manual. verizon.com/support/residential/battery-backup/backup-unit This beep is more like once in 2 hours.
    – abhi
    Mar 11 '20 at 15:45
  • I seem to recall the ONT manual was not accurate. I would unplug the battery and see if the resulting beep is the same tone. Mar 11 '20 at 15:49
  • If I unplug the battery, will I still have the internet connectivity in the house?
    – abhi
    Mar 11 '20 at 15:50
  • 1
    The unit I had worked as long as it still had AC power. Mar 11 '20 at 15:54
  • The ONT power supply has indicator lights to tell you the health of the battery.
    – longneck
    Mar 11 '20 at 17:45

Is it possible that you've been pranked?

A beep every two hours doesn't sound like something that would be designed into a product to make you aware of an issue

Consider a prank noise maker such as Electronic Cricket.

  • Are you kidding me? I've been chasing a beep for 5 years. I think it's a smoke detector that was mounted in the rafters after a foam insulation ceiling went up. Mar 11 '20 at 22:19
  • to make matters worse, many of them have some randomization to the timing to further make it both hard to find and increase the level of frustration :\
    – Ack
    Mar 11 '20 at 22:36
  • 1
    To make matters more worse, some have a proximity sensor - besides randomization - that will mute them if a person is in the same room or nearby.
    – xeeka
    Mar 12 '20 at 3:42
  • 1
    while we are brainstorming off-beat ideas, I personally went looking for a smoke detector with a dying battery in my home for about a week, to the point of taking one down at a time and placing on my desk to see if it was the one chirping. Turned out that the person who composed the music in a video game used the chirp during a flame-themed battle.
    – Yorik
    Mar 12 '20 at 15:05

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