Refrigerator

A refrigerator comprising:

• a cabinet having a storage space;
• a door that opens and closes the storage space;
• a door sensor to detect an opening and closing of the door;
• and
• an ice maker provided in the cabinet or door,
• wherein the ice maker includes a first tray that forms a portion of an ice making cell, which is a space where water is phase-changed into ice by cold,
• a second tray that forms another portion of the ice making cell,
• a heater to supply heat to the ice making cell,
• a temperature sensor to detect a temperature of water or ice in the ice making cell,
• a driver to generate a driving force to move the second tray with respect to the first tray, and
• a controller to control the heater and the driver,
• wherein the controller is configured to operate the heater when an operation start condition of the heater is satisfied,
• after an operation of the heater starts, the controller is configured to determine whether a first condition is satisfied to determine an operation start condition of the driver when the door sensor does not detect an opening of the door,
• wherein the controller is configured to determine whether a second condition is satisfied to determine the operation start condition of the driver when the door sensor detects the opening of the door.