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①During cooling operation, the drain pipe does not discharge water, and the water overflows from it, dripping into the room. Cause of the failure: The installed drain pipe is slightly tilted inward. Troubleshooting: When installing the indoor units of all types of air conditioners, attention must be paid to the drainage pipes. When installing ceiling-mounted equipment, the impact of an inclined installation is greater, and special attention must be paid. ②Cause of partial blockage in the inhalation section: Reduced air flow leads to decreased performance, and external circulation also reduces performance. In both cases, normal heat exchange between the air and the refrigerant has an impact, resulting in blockages at the air inlet and outlet. Troubleshooting: Remove the indoor components and any items inside that may affect air intake and exhaust to ensure proper air flow. ③Causes of poor compressor performance: An air short-circuit loop forms between the indoor and outdoor units, reducing efficiency. If an explosion-proof air conditioner is used for a long time in this condition, it will affect the normal load on the compressor. Troubleshooting: All indoor units of the PLH, PJH, PCH, PKH, and PSH series are designed with direct exhaust, so no covers should be installed. Due to design requirements, when explosion-proof air conditioners must be installed concealed, the PLH, PJH, and PE series of explosion-proof air conditioners must be used. ④Reasons for poor performance of explosion-proof air conditioners: The throttle has an impact; oil splashes that are drawn in can degrade the air conditioner’s filters and reduce the efficiency of the fan and evaporator. Troubleshooting: Compared to normal operation, air conditioners tend to experience a decrease in performance when operating in an environment contaminated with oil. ⑤Reasons for the failure of explosion-proof variable-frequency air conditioners to operate or to function properly: influence of high frequencies. High-frequency scattering from a special external source causes abnormal signals in the air conditioner’s microprocessor. Air conditioners and other machinery use only one power source. Fault diagnosis: Check for the presence of mechanical components causing high-frequency scattering. ⑥The use of multiple explosion-proof air conditioners results in abnormal load on the compressors, a decrease in energy efficiency, and eventually compressor damage. The reason for this is that installing two or more units in one place creates a short-circuit circuit; hot air then passes from the back of the outdoor unit to the front panel of the air conditioner, preventing proper heat exchange from taking place. Troubleshooting: When two or more outdoor units are installed in the same location, they should be placed in positions where they are not directly exposed to the airflow from other units, with a certain distance between them.