Refrigerator Making Loud Humming Noise

Quick answer

A loud humming noise from your refrigerator is often caused by a faulty condenser fan motor, overworked compressor, or dirty coils. Check the coils for dirt, ensure proper ventilation, and listen for specific components causing the noise.

Confirm the symptom

• Loud humming or buzzing sound coming from the back or bottom of the fridge
• Noise is continuous and gets louder when the fridge is running
• No unusual smells or leaks, but the noise is distracting or concerning

Tools and prep

• Screwdrivers (flathead and Phillips)
• Soft brush or vacuum with brush attachment
• Thermometer (optional)
• Work gloves
• Safety glasses
• Flashlight
• Level (optional)

Step-by-step troubleshooting

1. Check for Obstructions
   Do: Inspect the back or bottom of the refrigerator for any objects blocking airflow.
   Observe: Look for items touching the coils or compressor.
   Means: Obstructions can cause the compressor to work harder, increasing noise.
   Next: If you find obstructions, remove them and monitor the noise level.
2. Clean the Condenser Coils
   Do: Use a soft brush or vacuum to clean the condenser coils located at the back or bottom of the fridge.
   Observe: Remove dust, dirt, and debris from the coils.
   Means: Dirty coils reduce efficiency, causing the compressor to run longer and louder.
   Next: After cleaning, check if the noise decreases.
3. Check the Compressor
   Do: Listen closely to determine if the noise is coming from the compressor.
   Observe: A loud humming or buzzing sound when the compressor starts up.
   Means: The compressor may be overworking or failing.
   Next: If the compressor is the source, consider replacing it or calling a professional.
4. Inspect the Condenser Fan Motor
   Do: Locate the condenser fan and check if it is running smoothly.
   Observe: Listen for unusual noises or check if the fan is not spinning.
   Means: A faulty fan motor can cause loud humming and affect cooling efficiency.
   Next: If the fan is faulty, it may need to be replaced.
5. Verify Leveling of the Fridge
   Do: Use a level to check if the refrigerator is sitting evenly on the floor.
   Observe: Uneven leveling can cause vibrations and noise.
   Means: Adjust the leveling feet to ensure the fridge is stable.
   Next: After leveling, check if the noise reduces.
6. Check the Start Relay
   Do: Locate the start relay (usually near the compressor) and inspect it for signs of damage or wear.
   Observe: A clicking or buzzing sound from the relay when the compressor starts.
   Means: A faulty start relay can cause the compressor to hum loudly.
   Next: If the relay is faulty, it may need to be replaced.

Common causes

Parts matching

Common parts needed to fix a loud humming noise in a refrigerator include:

• Condenser coil cleaning brush
• Condenser fan motor
• Start relay
• Compressor (if faulty)
• Leveling feet adjustment tools

Always refer to your refrigerator's manual for specific part numbers and compatibility.

When to call a professional

• The noise persists after cleaning coils and checking components
• You suspect a refrigerant leak or compressor failure
• You are unsure about electrical components or lack the necessary tools
• The refrigerator is under warranty and you don't want to risk voiding it
• The noise is accompanied by other issues like poor cooling or unusual smells

FAQ

Related guides

Related searches: refrigerator condenser coil cleaning, refrigerator compressor noise, condenser fan motor replacement, refrigerator start relay replacement, refrigerator humming noise solutions, refrigerator noise troubleshooting, refrigerator maintenance tips, how to clean refrigerator coils, refrigerator compressor replacement, refrigerator vibration noise