Why frost accumulated on AC evaporator or what is the reason for ice formation in the indoor unit?

Answer:

There are 5 main reasons for ice formation in the evaporator coil or indoor unit.'

• 1)Insufficient airflow:

           It occurs when,
                  Air filter chocked
                  Evaporator coil chocked
                  Blower blades clogged
                  low blower motor speed        

• 2)Less gas in the system
• 3)Low ambient temperature/less heat load in the room
• 4)Low thermostat setting
• 5)Mechanical failure: It means refrigerant pipe pinched, capillary tube blocked and filter dryer jammed.