Installed the C-7 Hub at my daughter's house some months ago and have it running 3.3.3.127. She complains that it consistently makes an annoying "beep", apparently at times associated with programmed events such as lights that turn on at sunset, etc. I was not aware of any component in the hub that would do this. Perhaps something internal vibrates when these programmed events occur? Anybody else experience this?
She’s hearing something else.
Question - is there a smoke/CO detector that is running out of battery? A long time ago, I had an unused detector stored in my attic that I forgot about. Couple of years later it started beeping, and it took me 6 months to figure out what it was.
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I have looked at the internals of these hubs, and I do not believe there is anything inside the case that is designed to make any noise, whatsoever.
If the hub is properly shut down, and left in that state... does the house still 'beep' occasionally? In the past, I have had these random 'beep' sounds and almost always, as @aaiyar mentioned, it is a smoke detector that wants a fresh battery. But a few times it has been some other device that I forgot about... 
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@wfoley These things don't beep. She's hearing maybe a fire alarm low battery or a water sensor going off?
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Side, but related, note... why do smoke detectors start warning about low battery at 2 in the morning? Never is it 10am... always the middle of the night... 
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And then imagine the freaking thing beeping periodically for 6 months, but you can’t find it because it is in a box in your attic!
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I want to get a handful of those low powered beep buttons that echo off of everything and drop them in friends houses....They emit a really low beep like you're not sure you heard it but it does it randomly and drives them insane...
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This was totally the resolution of an episode of "Modern Family."
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Yes.
Short version:
In my case, the beeps were coming from the UPS the hub was plugged into. It was overreacting to fluctuations in voltage. Changing offsets in my rules got rid of it.
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Thanks to all for the feedback. I suspect that @bjcowles might be on to it. Daughter is 500 miles away, so solution will probably have to wait for my next visit unless I can talk her through some remote experimentation.
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The low battery alarm on my Verizon FIOS Optical Networking Terminal is particularly annoying because the beep is infrequent enough that it is hard to track it down. Now I have learned to look for the alarm indicator light . . .
As others have said, there is no sound generating device in the Hub.
However as unlikely as it is, there is a possibility the power adapter can make a noise if it is failing.
Just another place to look.
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Ordered!
The reviews on this device are hilarious. Gonna have some fun with this device 
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Good thought. Will be easy for my daughter to check this out.
I can think of one power supply in our house that makes a high pitched noise when the load increases. Either the switching frequency is in the audible range or some component (inductor or such) just happens to resonate in the audible range.
Upon further analysis, the Hubitat C-7 is not at fault as I previously suspected.
As it turns out, even though the musical note on the menu page of the Radio Thermostat CT-100 Plus had the slash over it to indicate that its beep tone was off, when the C-7 hub sent a temperature setting command to it, it beeped and displayed what looks like an error message. Obviously, the error message over-rode the thermostat's no-beep setting.
So, the C-7 hub is not responsible for the continued beeps, but rather, they come from the Radio Thermostat CT-100 Plus just above it on the other side of the wall.
There is nothing in the CT-100 Plus manual that addresses an error beep or error characters as shown above. Thinking that the error might be coming from bad commands sent from the thermostat driver, I replaced what seemed like the recommended Radio Thermostat CT-101 driver with a recently updated user-supplied driver. No change -- still beeping when temp setting commands are sent to thermostat at early AM, mid-morning, late afternoon and evening as per the Thermostat Scheduler. Might someone have a guess as to what the thermostat is struggling with? I don't see any error messages in the logs, etc. Radio Thermostat organization seems to have folded, so no response from a query to them. More things to try, please.
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Does it have a battery backup? Could the battery be low?
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Issue resolved! As it turns out, once I was able to get on site with device, I Excluded the thermostat, hard reset it by pushing a paperclip into the small hole, and then re-Included it into the mesh. I no longer get the error message when sending a temp setting command, and there is no beep.
Thanks to all who weighed in on this.
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