Bearing worn out
Motor Burnt
Shaft struck
Blade bent
Pipe lines with more joints
With more horizontal distance
System pipes with minimum bends
Install units as far as possible
High ambient temperature
Low ambient temperature
Condenser tube leaky
Blower motor failure
Unit consumes less power
Increases super heat
AC unit runs continuously
Relay malfunctions
Condensation poor
Refrigerant is more
Refrigerant leaked
Over charged oil