Check the drainage pump
Check if the water overflows?
If the drainage pipe is unblocked
and if the water flow is smooth?
If the drainage pump is running?
Fault display
If the voltage of liquid level switch
terminal is correct?
Replace the mainboard of indoor unit
If the voltage of drainage pump
terminal is correct?
Check the liquid level switch
Adjust the drainage pipe
Replace the mainboard of indoor unit
Check the wiring of drainage pump
NO
YES
YES
YES
NO
NO
YES
YES
NO
NO