This goes against what we know about good design. Where possible you shouldn't need to use a manual. Telling people to always read the manual is a cop out.

Also he apparently read his furnace's manual and months/years later remembered what a flashing light meant, despite never having had to refer to it again? Either this guy has freakishly good memory (possible but unlikely) or he's bullshitting. Given the overall tone I'd go with the latter.

And what is even the advantage of knowing in advance? Does he think people would not read the manual after seeing a flashing error light? You can look up most issues when they happen you don't have to memorise error codes in advance.

This is just a dumb "I'm so great" post.