Air conditioner terminal fault control method and air conditioning unit

The invention provides an air-conditioning terminal fault control method and an air-conditioning unit, and the control method comprises the steps: when an air-conditioning terminal of any working surface breaks down, stopping the air-conditioning terminal with the fault, and obtaining a cold load Qm required by the working surface; and according to the comparison result of the cooling load Qm needed by the working face and the preset load of the working face, the series-parallel connection mode of the working face air conditioner tail end is adjusted. When the tail end combination cabinet of the mine air conditioner breaks down, fault equipment is maintained by turning off the stop valve; serial and parallel flow paths are automatically switched according to loads, and a bypass valve of a hydraulic fan is adjusted to realize self-adaptive distribution of cooling capacity; and detecting the pressure difference of the hydraulic fan by using a pressure sensor, and judging whether the hydraulic fan is damaged or