Refrigerator Compressor Humming

Introduction

Is your refrigerator making a humming noise that just won’t go away? That humming sound often comes from the compressor, the heart of your refrigerator, and while a little hum is normal, a loud or persistent humming can signal a problem. This means your fridge might not be cooling efficiently, which can lead to spoiled food and higher energy bills. Addressing this issue promptly can prevent costly repairs down the road. If you’re hearing unusual humming, especially if accompanied by other issues like temperature changes, it’s time to investigate!

Common Causes of refrigerator compressor humming

There are several reasons why your refrigerator compressor might be humming louder than usual:

• Dirty Condenser Coils: Dust and debris on the coils located at the back of your fridge can restrict airflow, causing the compressor to work harder and hum louder.
• Faulty Start Relay: The start relay helps kickstart the compressor. If it’s failing, it can cause a humming sound as the compressor struggles to start.
• Worn-Out Compressor Motor: Like any motor, the compressor motor can wear down over time, leading to increased noise.
• Iced-Up Evaporator Coils: Ice buildup on the evaporator coils (usually inside the freezer) can restrict airflow and put extra strain on the compressor.
• Loose Mounting Bolts: The compressor is mounted to the refrigerator frame. If the bolts are loose, the vibration can create a louder hum.
• Overload Protector Issues: This safety device protects the compressor from overheating. A faulty overload protector can cause the compressor to cycle on and off rapidly, creating a humming sound.
• Refrigerant Issues: Low refrigerant levels or a refrigerant leak can sometimes cause the compressor to work harder and make unusual noises.
• Fan Motor Problems: Sometimes the noise isn’t the compressor at all, but the condenser fan motor located near the compressor. If its failing, it can also hum.

Symptoms Checklist

Use this checklist to help pinpoint the source of the problem:

• Is the humming louder than usual?
• Is the refrigerator not cooling properly?
• Is the freezer warmer than usual?
• Is there frost buildup in the freezer?
• Is the compressor hot to the touch?
• Is the refrigerator cycling on and off frequently?
• Are there any other unusual noises, like clicking or buzzing?

How to Fix refrigerator compressor humming Step-by-Step Guide

1. Unplug the Refrigerator: Always disconnect the power before working on any appliance.
2. Locate the Compressor: The compressor is typically a black, cylindrical component located at the back of the refrigerator, near the bottom.
3. Clean the Condenser Coils: Use a vacuum cleaner with a brush attachment to remove dust and debris from the condenser coils. This will improve airflow and reduce strain on the compressor.
4. Inspect the Compressor Mounting Bolts: Check if the bolts holding the compressor in place are tight. If they are loose, tighten them carefully.
5. Listen Closely to the Compressor: With the refrigerator plugged in briefly (for just a few seconds), try to pinpoint where the humming is coming from. Is it definitely the compressor itself, or does it sound like it’s coming from nearby components?
6. Check the Condenser Fan: Locate the condenser fan (usually near the compressor) and ensure it’s free of obstructions. Clean any dust or debris from the fan blades. Spin the fan blade. Does it spin freely, or is it stiff?
7. Defrost the Refrigerator: If you suspect ice buildup, manually defrost the refrigerator and freezer. Unplug the refrigerator and leave the doors open until the ice melts completely.
8. Check the Start Relay: The start relay is a small component attached to the compressor. If you are comfortable, carefully remove it (after unplugging the fridge!) and inspect it for any signs of damage, such as burnt spots or cracks. Note: Testing relays is beyond the scope of a beginner’s guide and may require a professional.
9. Listen for the Overload Protector: The overload protector is another component near the compressor. If it’s clicking on and off repeatedly, it may be faulty. Again, diagnosis beyond simple observation is beyond the scope of a basic guide.
10. Plug the Refrigerator Back In: After completing these checks, plug the refrigerator back in and observe if the humming noise has decreased or disappeared.
11. Monitor the Refrigerator Temperature: Keep an eye on the temperature inside the refrigerator and freezer to ensure they are cooling properly.
12. Wait and Observe: After making these adjustments, give the refrigerator a few hours to stabilize. The compressor’s humming may lessen as it gets back to its normal operating conditions.

Fix the Issue Without Buying Parts

Before considering replacing parts, try these free methods:

• Refrigerator Reset: Unplug the refrigerator for 30 minutes to reset the system.
• Thorough Cleaning: Clean both the interior and exterior of the refrigerator, including the door seals.
• Temperature Recalibration: Ensure the temperature settings are appropriate for your needs and the ambient temperature of your environment.
• Regular Inspection: Make it a habit to check the condenser coils and fan regularly for dust and debris.
• Proper Ventilation: Ensure the refrigerator has enough space around it for proper ventilation.

When Replacement Might Be Necessary

If the humming persists after trying these troubleshooting steps, and the refrigerator is not cooling properly, it may be time to consider replacing the compressor or the entire refrigerator. Compressor replacement typically costs between $300 and $700, depending on the model and labor costs. Common parts that might fail include the compressor itself, the start relay, and the overload protector.

Safety Warning

• Always unplug the refrigerator before performing any maintenance or repairs.
• Avoid working on electrical components with wet hands or on a wet floor.
• If you are not comfortable working with electrical appliances, consult a qualified technician.
• Be careful when handling sharp tools or components.

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Vacuum cleaner with brush attachment
• Wrench or pliers
• Multimeter (optional, for testing electrical components – requires electrical experience)

FAQ

1. Q: Why is my refrigerator compressor humming even after cleaning the coils?
2. A: If cleaning the coils didn’t solve the problem, the humming might be due to a faulty start relay, a worn-out compressor motor, or other internal issues.
3. Q: How do I know if my refrigerator compressor is going bad?
4. A: Signs of a failing compressor include excessive noise, poor cooling performance, and frequent cycling on and off.
5. Q: Can I replace the refrigerator compressor myself?
6. A: Replacing a compressor requires specialized knowledge and tools, including refrigerant handling. It’s generally recommended to hire a qualified technician.
7. Q: What is the average lifespan of a refrigerator compressor?
8. A: A well-maintained refrigerator compressor can last 10-15 years.

Conclusion

A humming refrigerator compressor can be a cause for concern, but with a little troubleshooting, you can often identify and resolve the issue yourself. Start with the simple steps outlined in this guide, and don’t hesitate to consult a professional if the problem persists. Taking a proactive approach can save you money and prevent further damage to your refrigerator.

Youtube Video: