Volume goes to zero and protection light comes on, any idea what the problem is?

I have the same problem on azur 640a, only pluged in power, still does same thing. Should I check capacitators first?

Hi I am having the same problem. I have disconnected all my speakers and the amp still activates protection light and the volume automatically returns to zero. Sometimes it just goes half way down and then stops but eventually it returns to zero. This is driving me mad. Have tried using different inputs but the same problem occurs. Any suggestions would be appreciated.

Check the speaker wires for a short. Try operating the amp without the speaker wires hooked up.