Whirlpool Dishwasher broken

Could be a few issues :

1. Check the water source make sure it is securely on
2. Check the filter is clean and clear of debris (inside bottom)
3. A bad water inlet valve (will require service)
4. It could be a stuck float (you can try to access it if handy) but will most likely need service

The last thing is a bad control board, but I would disconnect the water from under the Sink first and put a bucket or pan there, start eliminating it from that point forward. See if the waterline is flowing water correctly and at full pressure.