Fault phenomenon: The exhaust temperature of the unit is high (over 100 °C) The unit coolant level is too low (should be visible in the oil sight glass, but not more than half); Dirty oil cooler; The oil filter element is blocked; Temperature control valve failure (component is broken); The oil-cut solenoid valve is not energized or the coil is damaged; The diaphragm of the oil-cut solenoid valve is ruptured or aged; Fan motor failure; The cooling fan is damaged; The exhaust duct is not smooth or the exhaust resistance (back pressure) is large; The ambient temperature exceeds the specified range (38ΰŃ or 46ΰŃ); Temperature sensor failure (Intellisys control unit); Whether the pressure gauge is faulty (relay control unit). Fault phenomenon: the oil consumption of the unit is large or the oil content of the compressed air is large Too much coolant; The oil return pipe is blocked; The installation of the oil return pipe (the distance from the bottom of the oil separation core) does not meet the requirements; Unit pressure is too low; The oil separation core is broken; The unit has oil leakage; The coolant has deteriorated or has been used for an extended period of time.​​ . Fault phenomenon: low unit pressure . The actual gas consumption is greater than the output gas volume of the unit; Bleed valve failure (cannot close when loaded); Intake valve failure; Hydraulic cylinder failure; Load solenoid valve (1SV) failure The minimum pressure valve is stuck; User pipeline network leaks; The pressure setting is too low; Pressure sensor failure (Intellisys control unit); Pressure gauge failure (relay control unit); Pressure switch failure (relay control unit); The pressure sensor or pressure gauge input hose is leaking; . Fault phenomenon: The exhaust pressure of the unit is too high . Intake valve failure; Hydraulic cylinder failure; Load solenoid valve (1SV) failure; The pressure setting is too high; Pressure sensor failure (Intellisys control unit); Pressure gauge failure (relay control unit); Pressure switch failure (relay control unit). . . Fault phenomenon: the unit current is large The voltage is too low; loose wiring; The unit pressure exceeds the rated pressure; The oil separation core is blocked; contactor failure; host failure; Main motor failure; . Fault phenomenon: the unit cannot start . The fuse is broken; The temperature switch is broken; Loosen the wiring; Main motor thermal relay action; Fan motor thermal relay action; Transformer is broken; Intellisys no power input (Intellisys control unit); The fault is not eliminated (Intellisys control unit); Intellisys controller failure.​​ . Fault phenomenon: large current or tripping when the unit starts . User air switch problem; Input voltage is too low; Star-delta conversion interval is too short (should be 10 ~ 12 seconds); Hydraulic cylinder failure (no reset); Intake valve failure (too large or stuck); loose wiring; host failure; Main motor failure; 1TR time relay is broken (relay control unit).