what is the reason for refer compressor starting and stopping too frequently (short cycling)? and action needed to rectify the problem?

Cause :

• In the coil gas trapped due to over frosting and hence sufficient gas unable to pass through return or suction line causing L.P. cut out.
• Charge of refrigerant is low.
• Due to Air in the system can cause high discharge pressure and cut off compressor on HP-cut out.
• Expansion valve is partially blocked

Actions to be done :

• Collect the gas in the receiver by defrosting the coil. Coil is defrosted once trapped gas is released, slowly open the receiver outlet and put compressor in use.
• Refrigerant to be charged.
• Purge the air out of the system by collecting the gas in to receiver.
• Clean the filters.