Refrigerator Making Loud Motor Noise

Quick answer

A loud motor noise in your refrigerator is often caused by a failing condenser fan motor, evaporator fan motor, or compressor. Turn off the power, clean the coils, and check the fan blades for damage. Replace faulty parts if needed.

Confirm the symptom

• Loud humming or buzzing from the back or bottom of the fridge
• Noise increases when the compressor turns on
• Noise is constant or occurs only when the fridge is running
• You can feel vibrations from the unit
• The noise is not from the ice maker or water dispenser

Tools and prep

• Screwdrivers (flathead and Phillips)
• Flashlight
• Work gloves
• Cleaning brush or vacuum with brush attachment
• Multimeter (for testing electrical components)
• Replacement parts (if needed)
• Turn off the refrigerator and unplug it before starting

Step-by-step troubleshooting

1. Locate the Source of the Noise
   Do: Listen and feel for vibrations to determine if the noise is coming from the condenser fan, evaporator fan, or compressor.
   Observe: Identify which component is making the noise.
   Means: Pinpointing the source helps determine the correct repair.
   Next: Check the condenser fan if the noise is near the back or bottom of the fridge.
2. Inspect the Condenser Fan
   Do: Remove the back panel or base grille to access the condenser fan. Check for dirt, debris, or damaged blades.
   Observe: The fan may be dirty or the blades may be bent or broken.
   Means: A dirty or damaged fan can cause loud noises.
   Next: Clean the fan and blades or replace the fan motor if damaged.
3. Test the Condenser Fan Motor
   Do: Use a multimeter to test the fan motor for continuity. Refer to the user manual for the correct resistance values.
   Observe: The motor may have no continuity or show incorrect resistance.
   Means: A faulty motor needs to be replaced.
   Next: Replace the condenser fan motor if it's not working properly.
4. Inspect the Evaporator Fan
   Do: Access the evaporator fan, usually located in the freezer compartment. Check for ice buildup, dirt, or damaged blades.
   Observe: The fan may be obstructed or the blades may be damaged.
   Means: A blocked or damaged evaporator fan can cause loud noises.
   Next: Defrost the area, clean the fan, or replace the fan motor if necessary.
5. Test the Evaporator Fan Motor
   Do: Use a multimeter to test the evaporator fan motor for continuity.
   Observe: The motor may have no continuity or show incorrect resistance.
   Means: A faulty motor needs to be replaced.
   Next: Replace the evaporator fan motor if it's not working properly.
6. Check the Compressor
   Do: Listen for a loud humming or buzzing noise from the compressor area. Feel for excessive vibrations.
   Observe: The compressor may be failing or the mounting feet may be loose.
   Means: A failing compressor or loose mounting feet can cause loud noises.
   Next: Tighten the mounting feet or consult a professional for compressor issues.

Common causes

Parts matching

If you need to replace a part, match these common refrigerator components to your model:

• Condenser Fan Motor - Usually located at the back or bottom of the fridge
• Evaporator Fan Motor - Typically found in the freezer compartment
• Compressor Mounting Feet - Located under the compressor
• Compressor - A large component at the back or bottom of the fridge
• Fan Motor Mounts - Hold the fan motors in place

Check your refrigerator's model number to find the exact replacement parts online or at an appliance store.

When to call a professional

• The noise persists after cleaning and replacing the fan motors
• You suspect a failing compressor and lack the tools or experience to test it
• You hear a loud knocking or rattling noise from the compressor
• The refrigerator is not cooling properly despite the noise
• You are unsure about the source of the noise or how to proceed with repairs

FAQ

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