Last Fault A 4098 OVER VOLTAGE

[David A]

@David A, thank you for your advice. So, it sounds like, when using an isolation transformer, it's a good idea to "over-provision" wattage (that is, buy a device with more generous wattage specs).
Regarding trying other type of filters, I did and the following power conditioner did not help me much:
https://www.amazon.com/Furman-AC-215A-Co...127&sr=8-4
I can't bring myself to spending $5000 on a power regenerator.

I have no experience with isolation transformers but they are power rated. Amplifiers including the Devialet do not draw a constant, unchanging amount of power, they draw power to meet their needs and their needs change as the level of the music changes so more power is drawn during loud passages than during soft passages. You need a transformer that can meet your Devialet's needs during loud passages.

Pick any power conditioning device you like and you'll be able to find positive and negative comments about it. What works for some people doesn't work for others and there's always variables in the situations being reported in the comments, variables in location, the noise on the line, the wiring in the house/apartment, whether the audio system is on it's own dedicated line in the house or sharing a line with other household appliances, how much power the user's system is drawing and so on. It's impossible to give a guarantee that something will work. Try before you buy.

Yes, regenerators are expensive. I didn't buy mine to fix the over voltage problem, I bought it to improve the sound I get. If there is a bug of some kind still in the software then I can't be certain that the P12's voltage correction will prevent it, it could happen anytime. I can't prove that it will never happen and I can't guarantee that a power regenerator would prevent it happening in your system. I can't guarantee that you won't see the problem again and I can't guarantee that you will. It's a possibility that you had a one time glitch for some reason and there's a possibility the cause was some intermittent fault that will recur sporadically. There is no way of knowing. If the cause of a fault can be identified it can be fixed but it a cause can't be identified you have no way of knowing if and when to expect this problem again.

HOWEVER the new Roon Ready firmware and OS software update is out to day. Among the new features listed is "Lower power consumption in sleep mode". I know that sounds like nothing to do with your problem but it does mean they made some changes to things affecting power in the amplifier so even if you aren't using Roon and want your amp to be Roon Ready I would seriously consider installing the new update because something in the changes affecting power management may fix whatever is causing your fault if the cause is something in the Devialet's software. Of course new software is also capable of introducing new bugs, There's no guarantee the new software will help you, and none that it won't make it worse. I've had it running for around an hour without problems so that means I've got until the next software update, whenever that is, to find out if there are any problems for me in this version.