Cook Sausage: Turn the pressure cooker on 'Sauté'. Adjust the heat level to 'Normal' and allow the pot to heat up. Once the display reads 'Hot', add the Italian sausage and cook, breaking it apart into smaller and smaller pieces as it cooks. Continue for 4 minutes. Add the onion powder, garlic powder, salt, and pepper and mix into the sausage and continue cooking until cooked through. About another 2 or 3 minutes. Turn off 'Sauté'.
Add Pasta and Marinara: Add the water to the pot and deglaze the bottom of the pot. Add the rigatoni pasta and push it down into the water as much as you can. Pour the marinara sauce evenly over the top of the pasta. Do not mix.
7-Minute Cook Time: Close the Instant Pot, set the pressure release valve to 'Sealing' and set the pot to cook on 'Manual' or 'Pressure Cook', 'High Pressure' for 7 minutes.
2-Minute NPR: Once the 7-minute cook time has completed, allow for a 2-minute Natural Pressure Release. When the 2-minute NPR has finished, release the remaining pressure and then open the pot.
Add Cheeses: Add the mozzarella cheese, ricotta cheese, and parmesan cheese to the pot and mix into the pasta until the cheeses are fully melted.