Issue with yamaha home cinema

Well, maybe one of the wires is worn out from friction or stuck, and over time the insulation deteriorates and eventually causes a short circuit; this happens over time. I've read quite a few comments, and in the end, this answer comes up in almost 100% of the cases.

The home theater amp goes into protection mode; I've just reread it, and we're always coming back to a speaker cable problem. In the worst case, the best solution would be to change all the cables.
Or the problem might be trickier than that; let me explain: it could be the winding of one of the speakers that is short-circuited, and that would trigger the same fault code. That can also happen; there's only one alternative: replace the speaker, or alternatively, disconnect the speakers and test it with the home theater system. Normally, there should be a TEST function.