Why Is My Fridge Making A Loud Humming Noise? 6 Causes and Solutions

1. Loose Parts

A common and easily fixable reason for a loud humming noise in your refrigerator is loose screws or fasteners. As the compressor runs, it generates vibrations that, over time, may gradually loosen these components. When this happens, the resulting movement can create an audible hum.

The Solution

If you have an older refrigerator, take a moment to check the screws at the bottom and back of the unit. Over time, they may loosen due to regular use. If any are not securely in place, use a screwdriver, wrench, or Allen key to tighten them. This is a straightforward task you can do on your own, but always unplug the appliance first to stay safe.

2. Improper Fridge Clearance

As the compressor runs, it produces subtle vibrations that can result in a humming noise if the refrigerator is placed too close to surrounding walls or cabinets. Maintaining adequate space around the appliance can help reduce this sound.

The Solution

Make sure your refrigerator has enough space around it to prevent unnecessary noise. Refer to the manufacturer’s guidelines for the ideal clearance, or as a general rule, leave about half an inch to an inch on each side and around two inches at the back.

3. Your Fridge Isn’t Level

The slight vibration caused by the compressor during normal operation can become more pronounced, leading to a noticeable humming sound if the refrigerator is not evenly leveled.

The Solution

Most refrigerators come with adjustable leveling feet at the base, allowing you to modify their height as needed. For safety, unplug the appliance before making adjustments. With the help of another person to gently tilt the fridge, turn the feet until the unit sits evenly on the floor. Using a level can provide accuracy, but ensuring all four feet make solid contact with the ground is the main goal.

4. Dirty Condenser Coils

When condenser coils become dirty, the refrigerator has to work harder to maintain the proper temperature. This extra effort can put stress on the cooling system, potentially leading to a noticeable humming sound.

The Solution

Carefully pull the refrigerator away from the wall and unplug it. Begin by using a duster to remove any loose dust from the condenser coils. If there’s still stubborn dirt, gently scrub the coils with an old toothbrush and a bit of water to clean off the remaining grime.

5. Compressor Issues

One of the most costly and serious problems that could lead to a loud humming sound in your fridge is a faulty or failing compressor. As the compressor operates, it vibrates, and if the internal parts are damaged or the motor begins to wear down, the resulting noise can become much louder and more noticeable.

The Solution

Compressors are intricate parts that are difficult to fix or replace on your own. It’s best to contact an SD Appliance Repair professional to verify if the compressor is the cause of the issue and have them handle the repair or replacement. Since this can be a costly repair, if your fridge is over ten years old, it may be more economical to replace the entire unit.

6. Dirty or Damaged Fans

Your refrigerator has two key fans, and if they are dirty or malfunctioning, they can produce a humming sound. If this is the case, the noise will typically occur intermittently when the compressor starts up or during the defrost cycle in the freezer, which usually happens twice a day.

The Solution

You can replace these parts yourself, but it’s important to ensure you buy the right replacements and turn off the power to the fridge beforehand. If you’re not confident in handling the repair, a professional can perform the task for a reasonable price.

When to Call a Pro

Several common causes of a loud humming noise in your fridge can be addressed with simple DIY fixes. Start by ensuring the appliance is level, has enough space around it, and that any loose screws underneath or at the back are tightened.
If these steps don’t resolve the issue, it’s time to call in an expert. Refrigerators contain delicate electrical parts near water lines and other intricate, costly components that can be tricky to repair. If the basic fixes don’t work, it’s best to contact an SD Appliance Repair service for professional help.