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Control codes are particular to model C0-C4 yours is a C1 control, With unit turned off and fascia removed and module exposed, there are six buttons. Ignore the first button under display and label remaining buttons from left to right S1 S2 S3 S4 and S5. The leds above each button label L1 L2 L3 L4 and L5. Enter coding mode as follows:
Press and hold buttons S2 S3 S4 and S5 simultaneously, then turn dishwasher on using on/off switch. When in coding mode leds L2 L3 L4 and L5 will be blinking.
Release buttons S2 S3 S4 and S5 to view control coding in display. To change control coding, press button S2 as needed to scroll through codes. Your model is C1 or 21.
Turn dishwasher off to save control coding and exit mode. Reinstall control to console. Reinstall fascia. Check operation.
Stu I have to step away let me open this up to others to assist you.
Get a voltmeter and simply see if the water valve is getting power or not when it should be filling. IF you have power to it then the valve is bad. Post back accordingly if needed.
If the fill is insufficient then the valve is bad or clogged as long as your supply pressure to it is fine. Cleaning the valve screen is almost impossible because of how it's made- just replace it.