Place a bowl on top of the chickpeas. Rinse and keep a potato inside it.
Cover tightly with the lid and pressure cook initially on medium heat. When you start hearing the hissing sound, lower heat and cook for 10 to 12 whistles.
When the pressure settles naturally, open the lid. Check the doneness of the potato by sliding a knife or fork through it. The fork or knife should slide in easily.
Check the doneness of the chana too. Then, drain and keep aside. To know how, swipe up!