Pathos Logos - Volume control problem

Posting for a friend.
Turned the power on, and once ready to go.
Just touch the volume control from zero to the first notch up and the volume starts blasting (at almost full gain)!
Have to immediately power down to avoid any possible damage on the speakers.

Anyone any suggestions on what I should do? other than sending the unit out to the dealer for service. Would appreciate any input.

You need to list the whole system. The other components may play a factor. Also list exactly how everything is connected.
Sorry. I forgot to ask if the amp has a phono preamp?
oppo bdp83
connected to micromega dac via coaxial digital
pathos amplifier via unbalance connection
apogee slant 6 speakers

no phono in the amplifier
Is this a new amp, or is it new to your friend? Could there be a unity gain input he is inadvertently using?
I was thinking that you may have a combo of a very efficient speaker and a high gain source, or maybe even using a phono preamp by mistake. Given that you have no phono input and your speakers are anything but efficient, I'm not sure what the problem is. You may have a problem with your amp. Try using a different input on your amp, and also a different source. The Oppo by itself, without the DAC will be OK for a different source.
This just happened, its been working normally all these while so....will try a different input without the dac and see. thanks