- Compressor: Humming sound
- Gas expansion: Boiling, gurgling or hissing sound.
- Defrosting: Water flowing sound.
** These sounds are normal and are usually an indication that the refrigerator is operating properly.**
1. Check that the refrigerator is level.
2. Check that the defrost water drain-pan on top of the compressor.
3. Inspect the compressor mounts.