OK, and please also reply on the initial question of how to check (initiate with the selector switch?) the error codes.
The selector knob spins a dial behind a small window, so the dial turns through 12 positions. The selector knob does not have a marking which rotates with the selector knob through the clock positions. So without knowing what is the 12 O'clock position, I cannot turn right by 3 clicks to the 3 O'clock position.
Above the knob is a glass window of about 90degree arc, and through this window I can see the part of the circular dial attached to the knob. The glass window is fixed in position and has a vertical line drawn. The knob rotates the dial which then shows which setting is seen behind the vertical line, and thus show the setting selected. The knob can be freely rotated clockwise or counterclockwise for rounds and rounds.
I cannot align the knob to a 3 o'clock position. Perhaps there is another way to get the error codes?