Method for cleaning indoor unit and outdoor unit of air conditioner

The present invention discloses a method for cleaning an air conditioner indoor unit and outdoor unit. The method includes: controlling a to-be-cleaned heat exchanger to enter a self-cleaning mode; adjusting an operating frequency of an air conditioner, an opening of a throttling device, and a corresponding fan speed of the to-be-cleaned heat exchanger, and maintaining an evaporating temperature of the working fluid in the to-be-cleaned heat exchanger within a present range, so as to enable a surface of the to-be-cleaned heat exchanger to frost; keeping the to-be-cleaned heat exchanger frosting for a time of t1; detecting whether a differential pressure between a high pressure and a low pressure of the working fluid in air conditioner meets a preset condition; when the differential pressure between the high pressure and the low pressure of the working fluid in the air conditioner meets the preset condition, controlling a four-way valve to change a direction, so as to perform a defrosting switching to indoor and outdoor heat exchangers; and when the differential pressure between the high pressure and the low pressure of working fluid in the air conditioner does not meet the preset condition, adjusting an operating parameter of the air conditioner to enable the differential pressure between the high pressure and the low pressure of working fluid in the air conditioner to meet the preset condition, and then controlling the four-way valve to change the direction, so as to perform a defrosting switching to the indoor and outdoor heat exchangers. A direction change of the four-way valve may be controlled by detecting whether the differential pressure between the high pressure and the low pressure of working fluid in the air conditioner meets the preset condition. Therefore, a great shock to the compressor because of an excessive differential pressure between the high pressure and the low pressure of working fluid in the air conditioner may be avoided.