Appliance Repair Questions? Ask a Technician for Answers ASAP
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First you will want to check that there are not any items in the freezer blocking the vent. Inspect the door seal to be sure it is making good contact. Check for ice or frost around the vent or walls which would indicate a door seal not being aligned. Pull it out and check the coils and components on the back are not caked with dust. If so then vacuum the dust and components and use a coil brush to clean off excessive dust. While there, check if the compressor is getting hot. This is the tank looking thing. Check for any oil substance and the coil connections. If you find any oil substance and the compressor is very hot then that is pretty strong evidence of a refrigerant leak. Inspect the evaporator for excessive frost buildup. If you find excessive ice then fully defrost the appliance. Fully defrosting includes emptying the appliance and unplugging it and leaving it with the doors open for at least 24 hours then wipe the inside clean with bleach and water to prevent mildew. If none of this solves the issue and there is no issue with the refrigerant leak then there is likely a faulty temperature sensor or control board.