I have a 1997 KitchenAid top freezer refrigerator, 22cf. It cools, it freezes but periodically (every three to four weeks)ice forms in the plenum between the freezer and refrigerator and blocks cold air from the freezer being blown into the refrig. Seems like an automatic defrost issue but I’m not sure. Model is KTLS22QDWHO. Help!
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Sounds like the condensate drain is plugging up causing the condensate to backup and freeze in the plenum. More information and the recommended fix in this Whirlpool service update.