Image forming apparatus and control method

A printer, comprising:

• a human detection sensor configured to detect a person in a predetermined region in the vicinity of the printer;
• an image forming unit configured to form a toner image on a first sheet in an image forming process;
• a fixing unit configured to heat the first sheet to fix the toner image to the first sheet, comprising a heater including a substrate and heating elements arranged on the substrate;
• and
• a controller configured to:
• begin a cooling process for cooling of the fixing unit when an overheating condition is met after the fixing of the toner image to the first sheet,
• permit the image forming unit to form a toner image on a second sheet after the cooling process ends according to a first cooling condition if the human detection sensor detects a person in the predetermined region, and
• permit the image forming unit to form a toner image on the second sheet after the cooling process ends according to a second cooling condition if the human detection sensor does not detect a person in the predetermined region, wherein
• the cooling process according to the first cooling condition ends in less time than the cooling process according to the second cooling condition.