Customer Questions and Answers for Diffuser by Whirlpool

Rick,

You will want to make sure that the diffuser is in the unit but it would typically not be the cause of the unit icing up. This would normally be caused by a defrost issue in which you will want to test the defrost heater and defrost thermostat for continuity. If they have continuity then the defrost control would be the cause for the unit to ice up.