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Check your doors and seals. Make sure the seals are tight and lined up with the metal door frame. Check the little ice dispenser seal, they can go bad or just not close and let in a lot of air. Whirlpool W10823377 Ice Door Kit - AppliancePartsPros.comMake sure all your food and drink is in sealed containers so it doesn't evaporate and add moisture to the air inside the refrigerator. If you have kids and they like to open both doors and just stand there and stare, tell em to knock it off. ;) Keep food away from the fresh food side intake. Just a few ideas.
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I have been battling this for about a year now, the lower vent (that circulates warm fridge air into the freezer) freezes up, causing lack of circulation and the fridge warming up. This happens every month or two, I need to manually defrost. I replaced the thermistor (in the freezer), the thermostat (in the freezer), the main control board (on top of the unit), confirmed the fans in the freezer are spinning and the heating assembly has continuity. I also checked the door seals, they look fine. I tried plugging fridge side pressure equalizer hole and the opening for the water hose, dusted condenser coils. It appears there is too much moisture entering the fridge. The ice covers the vent hole on the freezer side, but there is no ice on the evaporator.
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