A noisy refrigerator is a serious annoyance. You spend a lot of time in your kitchen. Other than your bedroom, you might spend more time here in the home than anywhere else. That means a noise fridge is something that has the power to drive you up the wall with its incessant noise.
Other than that, though, it’s considerably stressful. Does the noise mean the unit is breaking down? Is the food inside safe? Is there an electrical issue that might start a fire?
Fortunately, most of the time the noise just means something is out of alignment and needs an easy refrigerator repair. For starters, get a flashlight and check underneath the fridge, as well as the sides and behind it. Clear out any dust, debris, or other items you find in these spaces. Sometimes a fridge just needs its space, and something could be blocking a fan or rattling audibly to otherwise quiet fridge vibrations.
A second step to try is physically moving the fridge an inch forward or back if there is room. Sometimes it just gets a little unsettled and needs to be re-stabilized to resume quiet operations.
A third thing to try is to rearrange items on or in it. This includes hard containers inside, the shelves and drawers themselves, and even things on top. You’d be surprised how often one of them is rattling sounds like a bad motor.
Finally, try physically unplugging the fridge from its power source for at least 30 seconds. This is more than just powering it down, physically unplug it. That gives circuit boards and modern motors a chance to discharge their old electricity and static and reset.
If none of these steps work, consult an electrician or appliance repairman.