haier HRF- 329AA - Manual (Page 31)

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4) Inspection method
To find the sources of noise ,press the vibration spot with your hand
while the refrigerator is in operation and listen attentively whether the
vibration becomes weaker or vanishes .If the refrigerator has not been
levelly placed ,put a level meter on its top table and adjust the leveling
screws on its legs .In case noise occurs from the compressor ,strike
different locations on the side surface of its case using a rubber hammer or
hand hammer with a wood block in-between so as to determine whether
the suspended springs are out of balance or being seized .
Maintenance Service and Trouble Shooting