Sizzling or Hissing Noise
A sizzling, hissing or dripping noise could be caused by water dripping on to the defrost heater during the defrost cycle. This is part of normal operation.
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Is the refrigerator level?
It is important to ensure the refrigerator is level. A properly leveled refrigerator will help with the overall proper operation of the refrigerator. Check to make sure the floor under the refrigerator is level. If the floor is not level shims may need to be used to properly level the refrigerator. Please refer to your Owner's Manual or Installation Instructions for specific leveling information for your refrigerator.