Each error points somewhere specific, and almost all of them are wiring or noise rather than the AVR. Read the error, then look at the thing it names.
"Speaker: none" on a speaker that exists. The mic did not hear it. Check that channel's wire at both ends, the terminals for a loose strand, and the AVR's speaker assignment (a rear pair wired to terminals set as "not used" will vanish exactly like this). If the speaker has its own level control, raise it. And make the room silent during the sweep: ceiling fans, AC hum, and traffic through open windows wreck detection at the quiet end. Calibrate at a quiet hour, with the fan off, even in May.
Phase warnings. Usually plus and minus swapped at one end of one run. Verify the same marking goes to the same terminal at both ends: red to red, the striped or marked conductor to the same side at speaker and AVR. It can also be a false alarm from room reflections on a correctly wired speaker, particularly a sub or a surround near a hard wall, because the mic hears the reflection arrive with the polarity flipped. If the wiring checks out physically, proceed; the AVR only asks you to confirm.
Matching errors, or one speaker flagged as much louder or quieter than its pair. Same fix path: a loose or partially connected wire, a level control on the speaker, or a speaker buried in a cabinet while its twin sits in the open.
Rules for a clean run: silence, the mic at ear height on a tripod (not a sofa cushion, not hand-held, because a hand moves and a cushion absorbs), nobody in the room, and the sweep started from outside the door.
Errors persist on one channel after the wiring checks out? Test that speaker on another channel and another speaker on that channel. You are isolating speaker from AVR, and that one swap answers it. Send us the exact error text and a photo of the terminals and we can usually name it.
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