Refrigerator Making a Thumping Noise (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

A refrigerator making a thumping noise is often due to loose components or a faulty compressor. Turn off the power, check for loose items, and inspect the compressor and condenser fan. If the noise persists, consider replacing the compressor or calling a professional.

Confirm the symptom

Hearing a rhythmic thumping or knocking sound
The noise increases when the refrigerator is running
The sound is not constant but occurs periodically

Tools and prep

Screwdrivers (flathead and Phillips)
Flashlight
Work gloves
Level
Towel or cloth
Owner's manual

Step-by-step troubleshooting

Turn Off Power
Do: Unplug the refrigerator or turn off the circuit breaker to ensure safety.
Observe: The refrigerator stops all sounds and vibrations.
Means: Power is safely disconnected for inspection.
Next: Check for loose items
Check for Loose Items
Do: Inspect the interior and shelves for loose items or containers that may be vibrating.
Observe: Any loose items are identified and secured.
Means: Loose items are not causing the thumping noise.
Next: Inspect the condenser fan
Inspect the Condenser Fan
Do: Locate the condenser fan (usually at the back or bottom of the refrigerator) and check for obstructions or damage.
Observe: The fan spins freely without any obstructions.
Means: The condenser fan is not causing the thumping noise.
Next: Check the compressor
Check the Compressor
Do: Listen closely to the compressor area for any unusual noises. The compressor is typically located at the bottom back of the refrigerator.
Observe: A loud thumping or knocking sound is heard from the compressor.
Means: The compressor may be faulty and needs attention.
Next: Test the compressor
Test the Compressor
Do: Use a multimeter to test the compressor's continuity and resistance. Refer to the owner's manual for specific instructions.
Observe: The compressor shows no continuity or abnormal resistance.
Means: The compressor is likely faulty and needs replacement.
Next: Replace the compressor
Replace the Compressor
Do: Purchase a compatible replacement compressor and follow the manufacturer's instructions for installation.
Observe: The new compressor operates without making a thumping noise.
Means: The issue is resolved with a new compressor.
Next: Final inspection
Final Inspection
Do: Plug the refrigerator back in and monitor for any remaining noises or issues.
Observe: The refrigerator runs quietly without any thumping sounds.
Means: The repair was successful.
Next: Complete

Common causes

Cause	Likelihood	Difficulty	Part often needed
Loose Items Loose items inside the refrigerator can vibrate and create a thumping noise.	Common	Easy	None
Condenser Fan Obstruction Debris or objects blocking the condenser fan can cause unusual noises.	Sometimes	Easy	None
Faulty Compressor A failing compressor can produce loud thumping or knocking sounds.	Sometimes	Hard	Compressor
Worn Out Bearings Worn bearings in the refrigerator's motor or fan can cause thumping noises.	Rare	Medium	Bearings
Uneven Floor An uneven floor can cause the refrigerator to vibrate and produce thumping sounds.	Sometimes	Easy	Leveling feet
Damaged Shock Absorbers Damaged or worn shock absorbers can allow excessive movement and noise.	Rare	Medium	Shock absorbers
Faulty Evaporator Fan A malfunctioning evaporator fan can cause unusual noises when running.	Rare	Medium	Evaporator fan

Parts matching

If you need to replace parts, ensure compatibility with your refrigerator model.

Check the model number on the refrigerator for accurate part matching.
Purchase parts from the manufacturer or a reputable supplier.
Verify the part's specifications match the original component.
Consult the owner's manual for recommended replacement parts.
Ensure the replacement part is designed for your refrigerator's make and model.

Keep the owner's manual handy to ensure you select the correct replacement parts.

When to call a professional

The thumping noise persists after checking all components
You are unsure about testing or replacing the compressor
The refrigerator is under warranty and you don't want to risk voiding it
You lack the tools or experience to safely perform the repairs
The noise is accompanied by other issues like poor cooling or excessive vibration

FAQ

Can a refrigerator making a thumping noise be fixed without replacing parts?

Yes, if the noise is caused by loose items or an uneven floor, you can often fix it by securing items or leveling the refrigerator.

How do I know if the compressor is faulty?

If the thumping noise is coming from the compressor area and persists after checking other components, the compressor may be faulty and need replacement.

Is it safe to replace the compressor myself?

Replacing a compressor can be complex and requires handling refrigerants, which should be done by a professional to ensure safety and compliance with regulations.

Why is my refrigerator making a thumping noise only when it starts up?

A thumping noise during startup may indicate a loose component or a compressor issue. Check for loose items and inspect the compressor for signs of wear or damage.

Can an uneven floor cause a thumping noise in a refrigerator?

Yes, an uneven floor can cause the refrigerator to vibrate and produce thumping sounds. Use a level to check the floor and adjust the leveling feet if necessary.