WON'T DISPENSE 1. Verify the unit is level.
2. Verify dispenser drawer is not clogged with detergent.
3. Check water connections to the unit and within the unit. Check for
plugged screen in water source.
4. Check dispenser motor.
5. Check harness connections.
6. Check CCU.
WON'T FILL 1. Check installation. Verify hot and cold water faucets are open.
these are a few things you need to check, also I'm sending you a link to the diagnostic proceders, follow the steps to check the system,
link, http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208181790.pdf let me know if you can follow the instructions,