OL, usually means Over Loaded. It is an error code thrown up by the on board
computer.. generally when TOO much wet weight is in the bowl.
This condition is could be caused by faulty solenoid or solenoids at the water inlet valve. Unplug the machine, turn off the water, and remove the supply hoses. Check the solenoids at the water inlet valve. They can be tested using a multimeter or ohmmeter and checking for continuity. A lack of continuity will indicate a faulty solenoid and the inlet valve assy will need to be replaced.
Try unplugging for 12 hrs before reconnecting
If the problem continues then the controller board is damaged and will need to be replaced.