Switch 26 is trough proximity (meaning the ball trough).
There is a small board located up near the ball trough (at the front on the right hand side). This will be the likely cause of your switch error.
You will know it is the correct one as it has a small 2 pin connector on it. Often it is just not making good contact with the board and the board is therefore not "powered up" so you get the switch 26 error. With machine turned on, unplug and plug back in this connector. Give the two wires in the connector a bit of a jiggle at the same time.
Let us know if the error goes away after turning machine on and off again and we can take it further if necessary.
For reference, the board is used to detect the powerball coming into play, the board basically detects that a metal ball is present so by process of elimination a lack of metal must indicate a ceramic powerball. Pretty clever, huh?
