In a slow cooker, mix together potatoes, soup, onion, and cheese. Add the sausage and stir in the milk and broth.
Cook 6 hours on low. Whisk together water and flour till smooth and pour into the soup. Cover and cook an additional 20 minutes to allow the soup to thicken slightly.
Serve hot and with crackers.
Notes
You may add additional flour and water to make a larger amount of the slurry if you prefer a thick soup. This amount will be slightly thick, but still closer to a soup consistency than a chowder.