The invention provides a protection method for a compressor at the high temperature and
high pressure during heating of an air conditioner. The protection method comprises the steps that S1, a maximum value I1 and a larger value I2 of a current of an outdoor unit, and a maximum value T1 and a larger value T2 of the temperature of a coil are set in advance; S2, in the heating mode, a
current sensor detects a current value I of the outdoor unit, a temperature sensor detects a temperature value T of the coil, and a judgement method of a
control system comprises the steps that (1) when I is larger than or equal to I1, the
control system controls an outdoor fan to stop working, and S3 is executed; (2) when I is smaller than I1 and T is larger than or equal to T1, the
control system controls the outdoor fan to stop working, and S3 is executed; and (3) when I2 is smaller than or equal to I and I is smaller than I1, and T2 is smaller than or equal to T and T is smaller than T1, the control
system controls the outdoor fan to stop working, and S3 is executed; and S3, the control
system judges whether a
recovery condition I or a
recovery condition II is met or not, wherein the
recovery condition I is that when I is smaller than I2 and T is smaller than T1, the outdoor unit returns to work, and operation returns to S2; and the recovery condition II is that when T is smaller than T2 and I is smaller than I1, the outdoor unit returns to work, and operation returns to S2. Through the adoption of the method, the high temperature and
high pressure prevention accuracy of an
air conditioning system is high.