I think there are two possible causes,
1. If this is the same tone you get when first connecting the charger, the charger may be disconnecting then reconnecting (at least logically if not physically), so it would be worth testing with a different USB power adapter and magnetic cable, according to what you have available. I know you have the adapter which charges your iPhone, so that would be perfect for testing.
2. Something actually wrong in the watch, either software or hardware. Software is a prime suspect because it started with the update. You could try unpairing and re-pair to your phone again to force reinstalling the Watch software. If that still doesn't work the last resort is Contact Apple Support and arrange to get it checked by Apple. Don't just skip to calling Apple Support, make sure you already tried the earlier steps because they will want to try these first.
Don't forget you can charge your watch at any time, you don't need to wait until overnight for testing the fixes!
I just started having this issue on a trip overseas to Europe. I have:
After reading through this thread, I noticed that people had narrowed onto the plastic charger as the component source of the problem. Some people reported that the plastic charger would get hot while charging the watch. The chime is the sound you get when the watch connects to the charger. I wondered if the plastic watch charger receives too much current when connected to a 2 amp USB-A source? Last night I changed the charger for my watch from the 2 amp high current one that I use for my iPad to the 1 amp one that comes with the Watch and the phone. I won't say that solved the problem yet because it's only one night but my watch did not chime last night. It just charged fully and it's ready this morning.
To reiterate my thoughts, I don't think that the plastic apple watch charger can handle the extra current from the iPad style high current chargers. I use these chargers in the UK and Europe because it's easier to adapt them to UK and European electrical outlets. The extra current that these chargers provide may be overheating the charger. Especially when the watch battery is already full. This causes the charger to stop charging. When it cools down, it automatically starts charging again, causing the chime.
-- Chris
My watch is an Apple watch stainless series 4 as well. I have used the plastic and metal, ipad and watch/phone, chargers. A few days ago it started pinging on any of them when it was fully charged. Everything looked clean on the watch and chargers. I tried all the techie solutions. Out of sheer exasperation, I cleaned the contact portions of my chargers and watch really thoroughly and almost miraculously the problem stopped. All is well (and quiet) once again. Might just be my watch, but it's worth a try!
Hmm too bad. Unpairing and re-pairing did not work for me either. What seems to be working was setting it up as a new watch as opposed to restoring from backup.
I have found this is an issue with Apple Watch (aluminium models) that are using a plastic magnetic charger. If you switch to a stainless steel magnetic charger, the issue is fixed.
Mine had a faulty charging block. I used a different block. The watched charged and the error message went away. Through that old block in the trash.
I upgraded to iwatchos 5.3 and no longer have this annoying chime when charging.
Thanks! I do have a stainless steel watch and was using a spare plastic charger. Once I switch to the original stainless steel charger, the chime while-on-charger stopped!
Better yet, put the watch in airplane mode while you sleep/charge it.
It would appear so, this has been tested with 2 different Apple Watch Series 3's (42mm Aluminium's on watchOS 5.1.2) and 3 different Apple plastic magnetic chargers. All exhibit the charging sound loop when at 100% battery using the plastic chargers, but not with the stainless steel magnetic charger.
Maybe Apple changed the specs of the chargers, as the plastic one is slightly bigger, maybe Qi or Induction compatibility issues with the plastic ones?
I would suggest that Apple need to offer replacement stainless steel chargers while they work on a fix.
Update:
I was able to contact apple support and they now say it is known software issue that the engineers are trying to resolve.
Then watch OS 5.2 was released. So figuring it couldn't hurt I installed it. After it installed I powered it off and on. Now the chiming has stopped. I don't know if the update really solved the problem or not. I've tried every solution suggested in this forum w/o success and others have said that the chime started for them with the OS 5.2 update. I'm keeping my fingers crossed that this issue is resoled for me for the moment.
Will anyone see this when the last post was weeks ago? I bought a charger that does both the watch and phone at the same time. The watch charger must be the cheap plastic kind you're talking about. I bought it for a trip, has no one figured out how to keep the watch from beeping so much? It will keep me awake in the hotel room.
Edit: Hard reset seems to have solved it.
If the problem is persistent and survives a forced reset it is almost certainly a hardware issue. It is noticeable that many users report improvement or even clearing the problem completely when using genuine Apple charging accessories, which tends to raise concern about some of the third party gadgets.
I posted earlier, but since I did a hard restart I haven't had the problem. Or maybe it was coming home and using the original charger, that came with the watch, instead of the travel charger I had on a trip.
I bought a XVIDA Basis wireless charger a month ago that accommodates 2 phones and 1 Apple Watch. Everything was fine until I upgraded to Watch OS6 yesterday (09/23/19). Today my Apple watch continuously dings while on the charger. It does not do this on the Apple charger. Here is a clip from the XVIDA web site: Works with Apple Watch Series 2 & 3, and Series 4 (not compatible with watchOS 6, including Apple Watch Series 5). So apparently the XVIDA Basis wireless charger will not work with Watch OS6. That may be your problem.
I just started having this problem today on 2 different chargers with Apple Watch 4. I cleaned the surfaces of both chargers and the the watch where they connect, and it has stopped (at least for now). I first tried hard reboot, unpairing, etc. Nothing like a good cleaning, I guess....
Continuous chime when charging
