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I am sorry to hear you are having trouble with your appliance.
I understand how frustrating that can be.
If the door seal is fine and the fan is working then this indicates temperature issue and/or an air flow problem due to heavy ice build-up inside the rear wall of the appliance.
Please try this:
Leave it unplugged and empty with door open for around 24-36 hours.
Then plug it back (expect some water on the floor) and wait for another 8 hours so it gets back to optimum temperature.
The problem should be resolved.
However, if the issue appears again then the problem is with defrost operation.
You will have to test/replace the temperature sensor and/or defrost heater element to resolve the issue.
Please do not hesitate to ask any follow up questions.
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