| Failure | Reason | Solution |
| High discharge temperature | Bad vent condition, Oil shortage ect. | Check the vent condition and lubricant amount ect |
| Temperature Sensor Failure | cable broken or sensorfailure | check the wirin and sensor |
| High Pressure | Pressure too high or the pressure sensor failure | Check the pressure and pressure sensor |
| Pressure Sensor Failure | cable broken, sensor failure or the cables connect reversely | check the wiring and pressure transmitter |
| Open Phase | power open phase or the contactor failure | check the power and ocntactors |
| Overload | voltage too low, tubes block, bearing wear off or other mechanical failure or wrong set date ect | check the set date, voltage, bearing, tubes and other mechanical system |
| Unbalance | Current unbalance, contactor failure or the internal open loop of the motor | check the power, contactor and the motor |
| Wrong Phase Sequence | phase sequence reversal or open phase | check the wiring |
| Motor Overload During Start | Master start time set to less than the star delta delay time | reset the master start time longer than star delay+2seconds |
| Main Contactor Shakes Frequently | the emergency stoop button is loose or controller is reset by interference. | check if the coil of contactor connects with RC snubber or not |
| Inverter Communication Fault | wrong set of relatively parameter of controller and inverter, communication cable loose | check the set date, check the cable |
