Reasons Why Refrigerator Makes Knocking Noise – Ways To Fix It

Is your refrigerator making strange intermittent knocking or banging sounds that have you puzzled? If so, this article on how to fix refrigerator knocking noise is precisely what you need! I empathize with the frustration of dealing with such noises in your kitchen, particularly when your refrigerator makes a knocking noise. That’s why I’ve added to my review the most optimal solutions to help you deal with such problems.

Common causes of refrigerator knocking noises

If your refrigerator makes strange knocking or banging sounds that make you annoyed, I’d recommend you don’t fret. These noises can be unsettling, but they often have identifiable causes that can be addressed. Let’s examine them in more detail.

Uneven refrigerator placement

• Cause: One of the primary reasons for knocking noises in a refrigerator is improper placement. If the fridge is not level, it can create vibrations and knocking sounds when the compressor or other moving parts are in operation.
• Detection: Use a level tool to check the refrigerator’s horizontal alignment. Place it on top of the fridge and adjust the leveling legs until the bubble is centered.
• Solution: Ensure the refrigerator is placed on a level surface. Adjust the leveling legs or use shims to stabilize the unit and eliminate the knocking noise.

Loose or faulty parts

• Cause: Over time, various components inside the refrigerator can become loose due to constant usage, leading to knocking or rattling sounds during operation. Additionally, worn-out or damaged parts can also be responsible for the noise.
• Detection: Look for loose or broken parts of the refrigerator. Pay attention to all components.
• Solution: First, make sure to tighten any loose screws or bolts in the refrigerator. If you find any broken parts, I recommend you consider replacing them with other compatible parts.

Ice buildup in the evaporator or condenser coils

• Cause: Excessive ice buildup on the evaporator or condenser coils can disrupt the normal operation of the refrigerator, resulting in knocking or clicking noises.
• Detection: Check the coils for a thick layer of frost or ice. A buildup of ice indicates a potential issue.
• Solution: Remove any ice buildup. If any problems are found after defrosting, replace the components.

Water hammer effect

• Cause: The water hammer effect occurs when the refrigerator’s water supply line experiences a sudden change in water pressure, causing intermittent knocking or banging sounds, just like when the freezer makes a knocking noise intermittently. This phenomenon arises when water flow is abruptly halted or redirected, leading to pressure fluctuations within the pipes.
• Detection: You can easily identify the water hammer effect when you hear loud, sharp knocking noises coming from the refrigerator, typically happening during the ice maker’s operation or when the water dispenser is in use. It might also cause the pipes to vibrate visibly.
• Solution: To address the water hammer effect, consider installing a water hammer arrestor or a pressure regulator on the water supply line. These devices work by absorbing the shock of sudden water pressure changes, preventing the pipes from rattling and knocking. You can find these components at hardware stores or seek assistance from a plumbing professional for proper installation.

Refrigerant flow noise

• Cause: Sometimes, the flow of refrigerant through the coils can produce a gurgling or knocking sound, especially during the defrost cycle.
• Detection: The noise will typically come from the back of the refrigerator when the defrost cycle is active.
• Solution: Refrigerant flow noises are normal and not a cause for concern. They do not require any action, as they are part of the refrigerator’s standard operation.