and   to the forum.

F2 is the 230VAC from the transformer. Remove the 20 pin connector (J3) on the Power Board. Change the fuse. If it still blows, you have a shorted CR-1 to CR-4. If not, then the problem will be on the Soldenoid Driver board. There should be a fuse on the SD board next to the heatsink. If this fuse is over rated, it will cause problems on the Power Board. Also, connectors on this board are almost always fried.

The CPU will flicker, first flash, pause, and then flash 6 more times (7 in total). Check for battery acid damage around the bottom section of the board.

The first step is always go back to the Power Supply and ensure the correct voltage are present. Remember, there is 230VAC floating around that board.