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It sounds like the humming could be coming from the lights in the cabinet. Are the lights fluorescent or LED? If they are fluorescent you might have a ballast going bad that needs to be replaced. If LED you would probably have one bad fixture. Are you able to find out which light style you have? Or are you able to send a picture if the lights themselves?
Also the easiest way to test this is disconnect the lights one at a time and see if the noise stops, indicating that fixture would be the bad one.
I'm sorry Iam not very fimilliar with Breckenridges as we do not have very many around here. If your power is disconnected though your noise should not be electrical, UNLESS you do have a battery. Which leads me to think you do. But i can not co nfirm this. I will opt out of the question and let someone else answer who will know more specifics on your Breckenridge model. Thanks.
Hi my name is Robert....
I keep reading your question and one thing that pops into mind is if you have a hot water heater in this area? Is there an outside access panel on the outside near that bathroom cabinet? Sometimes they will put a check valve on the water heater and if it fails and under pressure it can make a humming noise, not only that sometimes the circuit board for the water heater could also make a noise... IF the water heater is in that area please get me the make and model of it. I am not sure on the battery normally it is up front, under the steps they like to keep them vented to the air.
Was just an idea as I have heard them make a buzzing sound when the check valve fails. There are still other experts that might have some input on this, I will put your question back up so others can respond.... Robert
One good way to see if you have a battery is to disconnect the AC power and see if any of the 12 VDC powered systems work. IF they do, you will have a battery someplace. The humming can very well be a bad ballast if these are fluorescent fixtures as those ballasts are 12 VDC powered in most coaches. One thing for sure...........it has to be electrical or from water moving. Can you attach a photo of the "black boxes" in question. And what is on the other side of the bathroom wall? Anything that might cause this? Please get back to me if you need more and we can sort this out. I will also make a phone chat option available for you as some customers like that method.
Pretty strange.......I don't know any other reason for a hum in there with no power on or if this isn't a water issue. No chance of a water leak underneath that would be causing a water caused vibration in that area? That would be worth checking.
About the only other thing that comes to mind here is some kind of vibration in the vent line off the plumbing. Sewer gas might be building up in that vent due to some kind of debris like wasp's nests in the top and allowing it to vibrate as they escape...............long shot for sure! Pretty strange and one I haven't seen before.........at least with no good explanation.
It can still come back out that way through the vents...........and you have to have something that vibrates here OR else you just have some kind of earth harmonics there. When did this start?
And where are you? No chance some kind of critters in the vents? That can happen in warmer climates, but I would think not in colder areas.
Maybe a bees nest in the wall?
That can't be if all the power is off...........that pretty much rules that out, unless there is a battery someplace and even then there has to be something there connected to power. And bees hum all the time...... Did this just start up?
"They" must have heard us discussing this............LOL!
Sometimes you will get a "humming" sound from the LP regulator, but I have never heard of it coming from the bathroom cabinet. Your LP regulator isn't underneath there is it?
Thought so, but didn't want to exclude anything that it might be...........thanks for giving us a shout here at Just Answer!