The present invention relates to a laundry washer/dryer (1 ) comprising a drum (2) wherein the laundry is placed, a tub (3) wherein the drum (2) moves, a motor (4) that moves the drum (2), one or more than one valve (5) enabling the water to be received from the water supply (S) and to be delivered to the tub (3), a jet pump (7) that enables the water to be flushed onto the laundry by means of a flushing nozzle (6), a level sensor (8) that detects the water level (L) inside the tub (3), a circulation duct (9) wherein the cycle of the processing air enabling the drying of the laundry is performed, a fan (10) providing the circulation of processing air, a heater (1 1 ) disposed inside the circulation duct (9), one or more than one temperature sensor (12) that is disposed inside the circulation duct (9) and that measures the processing air temperature (T) and a control unit (13) that implements the fire safety algorithm.