Suction pressure rises

Discharge pressure decreases

Compressor oil level falls down

Compressor oil level increases

High oil level

Liquid refrigerant entry

Shortage of refrigerant

Air entered into system

Over charge

Under charge

High condensing pressure

Partial blocking of filter drier

Excess refrigerant

High evaporator load

Insufficient refrigerant

Condenser water pump not working

Lack of lubrication

Damage condenser fan

Low load on evaporator

Defective cooling water pump