Dishwasher wont fill

Make sure the dishwasher is not stuck in some kind of error mode. Make sure the water valve is turned on. Take the bottom front service door off and locate the water valve on the front left bottom of the machine. Make sure there are wires connected to it. If it's still not working, pick up a cheap electrical multimeter. Set it to the resistance setting, and remove the wires from the water valve. Test the resistance across the water valve's terminals. If the resistance is very high, or infinity, the water valve needs to be replaced. If the water valve is ok, turn the dishwasher on and test the voltage across the wires that go to the water valve at a time in the cycle when you know the dishwasher's controller will be trying to let water in. It may be either ac or dc voltage, so try both settings on the meter if you don't get a reading. If no voltage is read across those wires, open up the dishwasher and find the circuit board that the water valve's wires connect to, and make sure they're connected to the board properly. If that still doesn't work, there's a problem with the dishwasher's control board. Look for a square or rectangular blue, gray, black, white box on the circuit board near where the wire plugs in. This is the mechanical switch that turns on the power to the water valve when the computer sends a signal that it wants water. This switch may be jammed up. Try tapping it firmly with screwdriver. If that doesn't work, you can desolder the power switch and solder on a new one. If that doesn't work, you'll need to replace the board or do some advanced work on it.