Checked that, still the same.
I got one of this and it has the same problem, I measured and the voltage is around 11 volt in on-off switch and the screws in the front. It doesn't seem to be any current in the chassis (0.6 V). I'd like also to know what can be done, is it something we can fix ourselves? Would a power supply from a laptop work for testing purposes, assuming it is the power supply? I'm in no mood to go through the return process, bought it at amazon.de. I'm using the stock 32V 5A power supply that came with it.
If AC power is present at the chassis and/or connectors with no other cables connected other than the power supply, it can only be the power supply.
The amplifier itself is only operated with DC voltage.
BUT this is not unusual. As long as the current flowing at the error voltage remains below 3.5mA, the whole thing is not dangerous, otherwise the existing FI switch in your fuse box should trigger. There is a high probability that it is not the only device in your household that generates an error voltage.
My AIYIMA original power supply (32V/5A) from the A07 generates an error voltage of 95.5 volts, power plug in the socket turned 180° 96.5 volts (choose plug direction with lower error voltage). That will be normal with this power supply.
A high-quality power supply, such as the Mean Well HRP-360-36 with a 3-pin power connection with protective earth, only generates approx. 9V AC voltage on the housing.