Re: faulty washing m/c
Here’s an article all about this stuff.
Basically, what it says in essence is that fault codes are handy (sometimes) as a diagnostic aid but, they are most certainly NOT a replacement for diagnostic skills. They are not a magic bullet, don’t guarantee that you get the correct component or tell you that if you change out a widget it’ll just work again.
You still have to be prepared to do some legwork yourself in short and be able to test components with a multimeter in order to diagnose the problem. 😉
And, like a PC going though POST, if it finds an error on startup then many machines will simply abort, give you an error code and sit there looking stupid.
HTH
K.