Efficient water pump

Drain line not properly installed

Condenser water pump defective

Over flow of water from cooling tower sump

Air in the system

Excess of refrigerant

Refrigerant leaked

Moisture in the system

Air filter blocked

Partially chocked drier filter

More air flows through the evaporator

Dust accumulated on condenser

Leak in the system

Fan capacitor is weak

Refrigerant under charge

Supply voltage is normal

Efficient compressor

Proper condensation

Good insulation

Dirty air filter