Fault phenomenon: the main performance is desiccant fault, filter or pipe blockage.Troubleshooting: desiccant is used to absorb moisture refrigerant, to prevent ice blocking. Black oil stains or other sundries can be observed on the liquid vision glass of the storage dryer. When maintenance, through the liquid storage dryer inspection window, such as see the desiccant for blue, indicating that the desiccant for the normal state; If see the desiccant for red or pink, at this point that the desiccant has failed, need to be replaced in time. The filter inside the dryer or its pipe is blocked due to excessive impurities, which will lead to the unimpeded refrigerant flow in the system and affect the refrigeration effect. During maintenance, if the filter is blocked, clean water can be used. If the filter is damaged or blocked seriously, it should be replaced in time.