Once it reaches temperature, add butter. As it melts, spread it across the bottom of the pot. Add chicken and cook until the outsides of the chicken chunks are mostly cooked, a few minutes, stirring occasionally.
Add onions, celery, and carrots, stirring everything together. Cook for a few minutes until fragrant, stirring occasionally. Turn off the sauté setting.
Add corn, chicken broth, pasta, dill, and pepper. Stir. Check that all ingredients are submerged in the liquid.
Cover and lock the lid on the pressure cooker. Select the manual pressure cooking setting and adjust the cooking time to 10 minutes at high pressure.