Customer Questions and Answers for Refrigerator Air Damper Assembly by Whirlpool

Jean, at this point, it's probably not a faulty diffuser WP2209751 It'll probably fail in the near future, but you have to eliminate the frost and ice first. Frost and ice inside a refrigerator/freezer is due to warm or moist air meeting cold air. So your first check needs to be at the door seals, dispenser seal and open containers in either compartment. Then start checking for electrical/mechanical failures, like a weak defrost thermostat, intermittent heater, or faulty control timer or board. Also check to see if there is water or ice on the floor of the freezer and refrigerator compartment, This would indicate a possible defrost drain issue and allows moisture to accumulate in the bottom and get distributed throughout the refrigerator.