Refrigerator Making Humming Noise

Quick answer

A humming noise from your refrigerator is often due to the compressor or condenser fan. Check for proper leveling, clean the coils, and ensure nothing is touching the unit. If the noise persists, it may indicate a failing component.

Confirm the symptom

• You hear a continuous low hum from the back or bottom of the fridge
• The noise increases when the refrigerator is running
• The noise is not related to water or ice dispensers

Tools and prep

• Screwdriver set
• Flashlight
• Soft cloth or brush
• Level
• Owner's manual
• Plug in a surge protector if testing electrical components

Step-by-step troubleshooting

1. Check Refrigerator Leveling
   Do: Use a level to check if the refrigerator is sitting evenly on the floor.
   Observe: If the fridge is tilted, it can cause the compressor to work harder and make more noise.
   Means: The unit may be unbalanced, leading to increased vibration and noise.
   Next: Adjust the leveling feet to ensure the fridge is level.
2. Inspect for Obstructions
   Do: Look around the back and sides of the refrigerator for objects touching the unit.
   Observe: Any contact with the fridge can amplify the normal operating noise.
   Means: The humming might be caused by the fridge vibrating against nearby objects.
   Next: Remove any items that are in contact with the refrigerator.
3. Clean Condenser Coils
   Do: Locate and clean the condenser coils, usually at the back or bottom of the fridge.
   Observe: Dust and debris on the coils can restrict airflow and cause the compressor to work harder.
   Means: A dirty coil can lead to increased noise and reduced efficiency.
   Next: Use a soft brush or vacuum to clean the coils thoroughly.
4. Check Compressor Noise
   Do: Listen closely to the compressor when the refrigerator is running.
   Observe: A loud, continuous hum from the compressor could indicate an issue.
   Means: The compressor may be failing or the start relay could be faulty.
   Next: If the noise is coming from the compressor, consider replacing the start relay or compressor.
5. Test Condenser Fan Motor
   Do: Check if the condenser fan is running smoothly without obstructions.
   Observe: A noisy or malfunctioning fan can produce a humming sound.
   Means: The fan motor may be worn out or the blades could be damaged.
   Next: If the fan is faulty, replace the condenser fan motor.
6. Inspect for Loose Parts
   Do: Check for any loose screws or panels on the refrigerator.
   Observe: Loose parts can vibrate and create additional noise.
   Means: Tightening loose components can reduce or eliminate the humming sound.
   Next: Tighten any loose screws or secure panels as needed.

Common causes

Parts matching

If you need to replace parts, look for these common components:

• Compressor or Start Relay for compressor-related humming
• Condenser Fan Motor for fan-related noise
• Adjustment Feet for leveling issues
• Capacitor for electrical problems

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

When to call a professional

• The humming noise is very loud or increases over time
• The refrigerator is not cooling properly despite troubleshooting
• You suspect a faulty compressor or electrical issue
• You are unsure about handling electrical components
• The noise is accompanied by unusual smells or smoke

FAQ

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