Haier BC-117A Series Service Manual page 29

If the leveling screws on refrigerator legs have not been adjusted
properly ,vibration and noise will still occur even if the refrigerator has been
placed on a level ground .
2) Abnormal noise from compressor
Three suspended spring inside the compressor case are out of
balance ,and strike against the case ,moreover ,the wear of compressor parts
may cause noise sometimes .
3) Resonance of tubing and loosening of parts
Improper and compact laying of tubes or the loosening of parts may cause
vibration and noise .
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 .
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Maintenance Service and Trouble Shooting
28