Check for ice on the back of wall in freezer section. check to make sure fan motor in freezer turning, if ice on wall you have a defrost problem. bad defrost control or bimetal which is located in freezer section. Check with a ohms meter. should get ohms areading if closed when cold. Last would be a bad defrost heater but rare. Also make sure air returns not block with ice. If so , could be a stop up defrost drain.
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Check for ice on the back of wall in freezer section. check to make sure fan motor in freezer turning, if ice on wall you have a defrost problem. bad defrost control or bimetal which is located in freezer section. Check with a ohms meter. should get ohms areading if closed when cold. Last would be a bad defrost heater but rare. Also make sure air returns not block with ice. If so , could be a stop up defrost drain.