Depends on the temp you have it set at, sometimes when we put food in ours we catch the temp dial and move to the coldest temp and its making a noise to get the temp down.
You could also check the seal round the door to make sure there is a tight seal.
tbh mine may make a constant noise but you just get used to it and don't hear it anymore, maybe because it's new your paying attention to a new or different noise to your last one.
