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There is a “Click” or a "Tick" sound in my refrigerator

Product name/model: RT210WM2110
1. Shrinkage and swelling of case will make such a sound; when the case is cold or the door is opened, this sound will occur phenomenon: there is a "hum" sound in the refrigerator).
2. Running of compressor will make such sound, if the refrigerator is not leveled, this sound will be louder.
you should consider to level up the fridge to avoid the noise.