test it in cool room not packed deep in some cabinet.
see if it is overheating (tmp)
also tested it in free space (no cab) and no speaker
the manual makes no mention of tmp or 429 errors so,, not good that.
things like this love to over heat, I make sure mine AVR has fresh clean cool air all the time with my cabinet vents and I raised mine on 1 inch boards 1"x18" under the feet front to rear, and this lets lots of fresh air go the vents
make sure all AVR casing vent are dust free>?
found your service manal
and TMP means this quoted
"The protection function worked due to the
temperature limit being exceeded. Causes
could be poor ventilation or a defect related
to the thermal sensor. If the power is turned
on with the abnormality unsolved, the pro-
tection function works in about 1 second to
turn off the power"
(and saves its own bacon, a super good that)
this error is stored in the logs, so that is only history.
here it is (the real; deal and free) PDF
https://elektrotanya.com/yamaha_rx-v559_dsp-ax559_htr-5950_sm.pdf/download.html#dl
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