Last Fault A 4098 OVER VOLTAGE

[Axel]

Could this be related to mains filtering? Has this happened to anyone if the amps are directly connected to the wall outlets?

I don’t use any mains filtering. It happened to me again three times in an hour. No idea what’s causing it, but I read this
 from the ADH page on the Devialet website:

In addition, microprocessor control of each amplification channel ensures their constant auto-calibration, as well as limitless protection against all of the following potential hazards: overvoltages, overloads, power pulses, thermal events.