What is the reason why the electric pressure cooker clicks when it is heated?

Maybe there is too little water in the pot.

When the electric pressure cooker is heated, the water in the cooker will gradually turn into steam, forming pressure. If the water in the pot is insufficient, the speed of steam generation will exceed the speed of water replenishment, resulting in excessive pressure in the pot. In order to balance the pressure, the exhaust valve on the cover will automatically open, releasing some steam, accompanied by a click. So when the electric pressure cooker is heated, it is probably because there is not enough water in the cooker. In order to avoid this situation, when using the electric pressure cooker, it is necessary to ensure that there is enough water in the cooker to maintain the normal heating and pressure relief process.