1. The principle of troubleshooting
From indoor to outdoor, side parts to central components, fan motor to compressor. Please listen to and ask the user carefully about the fault and information related, then make a judgment based on your experience and check the units regarding the fault description. Please do not remove any part blindly or the fault might be expanded.
2. Preparations for troubleshooting
1) Please check whether the power supply has voltage and whether the voltage is in accordance with the operation requirements of A/C (single phase: 198V-242V; three phases: 342V-418V);
2) Please check whether the power wire, the indoor and outdoor connecting line is correct and reliable;
3) Please check whether the wire insulation is damaged.
3. Troubleshooting
Window Type
| Failure | Probable reasons | Probable reasons | Probable reasons | Solutions |
| whole unit is out of work | no power supply | | | wait for the power supply |
| leakage switch trips | switch fault | | replace the leakage switch | |
| winding insulation of fan motor is cracked | | replace the fan motor | ||
| winding insulation of compressor is cracked | | replace the compressor | ||
| compressor is blocked | rotor is cracked | replace the compressor | ||
| winding of transformer is open circuit | | | replace the transformer | |
| fuse on the PCB is open circuit | | | replace the fuse | |
| PCB fault | 7805 component fault | | replace the 7805 component or PCB | |
| No cooling effect | setting of the remote controller is improper | | | set the remote controller properly |
| fan motor is out of work | PCB has no output | relay is out of work | replace the relay or PCB | |
| chip is out of work | replace the chip or PCB | |||
| capacitor decays completely | | replace the capacitor | ||
| bearing of the fan motor is blocked deadly | | replace the fan motor | ||
| winding of fan motor is open circuit | | replace the fan motor | ||
| compressor is out of work | PCB has no output | relay is out of work | replace the relay or PCB | |
| chip is out of work | replace the chip or PCB | |||
| capacitor decays | | replace the capacitor | ||
| winding of compressor is open circuit | | replace the compressor | ||
| compressor is blocked | rotor is cracked | replace the compressor | ||
| compressor is not sucking or discharging | rotor is cracked | replace the compressor | ||
| no refrigerant | leakage | | find the leakage points and fill refrigerant after repairing welding. | |
| poor cooling | The setting temp of the remote controller is too high. | | | Turn down the setting temp. |
| room is not sealed enough | | | seal the room | |
| filter is too dirty | | | clean the filter | |
| evaporator or condenser is too dirty | | | clean the evaporator or condenser | |
| revolving speed of fan motor is slow | capacitor decays | | replace the capacitor | |
| winding resistance of fan motor is less than normal | | replace the fan motor | ||
| refrigerant is not enough | leakage | | find the leakage points and fill refrigerant after repairing welding | |
| poor air exhaustion | it’s blocked with sundries | | clean the sundries | |
| Noisy | fan blade vibrates | fan blade is cracked | | replace the fan blade |
| bearing of fan motor is wearing | | | replace the fan motor | |
| water leakage | water plate is filth blockage | | | clean up the dirty stuff |
| evaporator is too dirty | | | clean the evaporator | |
| evaporator frost | refrigerant is not enough | | find the leakage points and fill refrigerant after repairing welding | |
| revolving speed of fan motor is too slow | capacitor decays | replace the capacitor | ||
| winding resistance of fan motor is less than normal | replace the fan motor | |||
| Cannot remote controlling | strong light resource exists nearby | | | replace the A/C or adjust position of the light resource |
| remote controller fault | remote controller is locked | | open the remote controller | |
| no battery or the battery lacks of power | | put the battery in or replace the battery | ||
| remote controller damaged | | replace the remote controller | ||
| receiver doesn’t receive signal | | | replace the receiver or PCB |
