A method for controlling a laundry machine , the method comprising: performing a first filter cleaning cycle for supplying cleaning fluid to the filter , performing an air supply cycle for supplying heated air or unheated air to laundry items received in a receiving space of the laundry machine , and performing a second filter cleaning cycle for supplying cleaning fluid to the filter after finishing the air supply cycle, the air supply cycle comprising: operating a fan for circulating air in the receiving space, the fan being provided in a duct forming a flow passage for circulating air through the receiving space; and spraying cleaning fluid onto a filter to remove debris from the filter , the filter being positioned under the fan for removing debris from the air being introduced into the duct from the receiving space, wherein spraying cleaning fluid onto a filter and operating the fan are not performed simultaneously, wherein the air supply cycle comprises a step (S230) for determining whether or not cleaning of the filter is required, which is performed by determining whether or not a rotational speed of the fan has increased from a lowest rotational speed to a pre-set rotational speed measured while operating the fan , and rotating a drum of the laundry machine that defines the receiving space in which the laundry items are received, wherein rotating a drum comprises rotating the drum while spraying cleaning fluid onto the filter . performing a first filter cleaning cycle for supplying cleaning fluid to the filter , performing an air supply cycle for supplying heated air or unheated air to laundry items received in a receiving space of the laundry machine , and performing a second filter cleaning cycle for supplying cleaning fluid to the filter after finishing the air supply cycle, the air supply cycle comprising: operating a fan for circulating air in the receiving space, the fan being provided in a duct forming a flow passage for circulating air through the receiving space; and spraying cleaning fluid onto a filter to remove debris from the filter , the filter being positioned under the fan for removing debris from the air being introduced into the duct from the receiving space, wherein spraying cleaning fluid onto a filter and operating the fan are not performed simultaneously, wherein the air supply cycle comprises a step (S230) for determining whether or not cleaning of the filter is required, which is performed by determining whether or not a rotational speed of the fan has increased from a lowest rotational speed to a pre-set rotational speed measured while operating the fan , and rotating a drum of the laundry machine that defines the receiving space in which the laundry items are received, wherein rotating a drum comprises rotating the drum while spraying cleaning fluid onto the filter . operating a fan for circulating air in the receiving space, the fan being provided in a duct forming a flow passage for circulating air through the receiving space; and spraying cleaning fluid onto a filter to remove debris from the filter , the filter being positioned under the fan for removing debris from the air being introduced into the duct from the receiving space, wherein spraying cleaning fluid onto a filter and operating the fan are not performed simultaneously, wherein the air supply cycle comprises a step (S230) for determining whether or not cleaning of the filter is required, which is performed by determining whether or not a rotational speed of the fan has increased from a lowest rotational speed to a pre-set rotational speed measured while operating the fan , and rotating a drum of the laundry machine that defines the receiving space in which the laundry items are received, wherein rotating a drum comprises rotating the drum while spraying cleaning fluid onto the filter . <EOS>