Water leakage
Wrap of refrigerant pipe joint is not close enough
Re-wrap and make it tight
Fan of indoor unit contacts other parts Adjust fan location
Foreign thing in indoor unit
Compressor shakes too much
Take out the foreign thing
Adjust support washer of compressor, and tighten
loosen bults
A bnormal sound 
and shake
Touch of pipeline of outdoor unit
Touch of inner plates
Louver of outdoor unit touched outer case
Abnormal sound inside compressor
Separate the touched pipeline
Tighten connect bolt
Stick absorbing clay between plates
Adjust location of louver
Change compressor
Abnormal solenoid sound from 4-way
valve when heating
circuit-short inside solenoid valve, change
the solenoid valve
131
Bird Single-Split Type