Fridge Makes Humming Sound

Introduction

A humming fridge can be annoying, disruptive, and even concerning. While a little bit of noise is normal, a loud or persistent humming sound from your refrigerator shouldn’t be ignored. It often signals that something isn’t quite right with its inner workings. Addressing this issue promptly can prevent further damage and costly repairs. This guide will walk you through common causes and troubleshooting steps you can take before calling a professional.

Common Causes of Fridge Makes Humming Sound

Here are some of the common culprits behind that humming noise:

The Compressor: This is the heart of your fridge. It circulates refrigerant, and a low hum is normal. A louder or struggling hum could indicate a problem with the compressor itself.
Condenser Fan Motor: Located at the back (or bottom) of the fridge, this fan cools the condenser coils. If it’s dirty or failing, it can create a humming or buzzing sound.
Evaporator Fan Motor: Located inside the freezer compartment, this fan circulates cold air. Ice buildup or a failing motor can cause noise.
Defrost Timer: Some refrigerators use a defrost timer that can make a humming sound as it cycles.
Water Inlet Valve: If your fridge has an ice maker or water dispenser, the water inlet valve may hum when it opens to refill the ice maker or water reservoir.
Relay Switch: A relay switch helps to control power to the fridge and when failing can emit a humming sound.
Loose Components: Sometimes, parts like the drain pan or tubing can vibrate against the fridge cabinet, causing a humming sound.
Ice Buildup: Excessive ice buildup around the fan can restrict its movement and create a humming or buzzing noise.

Symptoms Checklist

Use this list to narrow down the cause of your fridge’s humming:

Loud Humming: Louder than usual operating noise.
Intermittent Humming: The humming comes and goes.
Constant Humming: The humming is always present when the fridge is running.
Vibrating Noise: The fridge itself vibrates along with the hum.
Humming with Icemaker: Humming only occurs when the icemaker is operating.
Humming after Defrost: Humming starts after the defrost cycle.
Cooling Problems: The fridge isn’t cooling properly.

How to Fix Fridge Makes Humming Sound Step-by-Step Guide

Follow these steps to troubleshoot the humming noise:

Unplug the Fridge: For safety, always disconnect the power before working on your refrigerator.
Clean the Condenser Coils: Locate the coils (usually on the back or bottom). Use a vacuum cleaner with a brush attachment to remove dust and debris.
Check the Condenser Fan: Make sure the fan blades are clean and can spin freely. If they are obstructed, remove the obstruction. If the fan is stiff, try lubricating the motor with a few drops of electric motor oil.
Inspect the Evaporator Fan: Open the freezer and check the evaporator fan (usually behind a panel). Remove any ice buildup that might be interfering with the fan blades.
Listen to the Compressor: Place your hand on the compressor (usually at the bottom back). If the humming is coming from the compressor, it may be the source of the problem.
Check the Water Inlet Valve: If your fridge has an ice maker or water dispenser, listen to the water inlet valve when it refills. If the valve is humming loudly, it might need cleaning or replacement.
Tighten Loose Components: Inspect the back of the fridge and look for any loose screws, panels, or tubing that might be vibrating. Tighten or secure them as needed.
Level the Fridge: An uneven fridge can cause vibrations. Use a level to ensure your fridge is sitting level on the floor. Adjust the leveling feet as necessary.
Check for Ice Buildup: Ensure the drain tube isn’t blocked with ice, causing water to overflow and potentially affect the fan.
Run Defrost Cycle: Manually trigger a defrost cycle to see if it resolves the ice buildup and reduces humming.
Inspect the Relay switch: Locate the relay switch and gently touch it. If it is vibrating it may be the source of the humming.
Restart the Fridge: Plug the fridge back in and observe if the humming persists.
Monitor for Further Issues: After doing the previous checks, keep an eye out for other issues that may arise after fixing the humming.

Fix the Issue Without Buying Parts

Often, the humming noise can be resolved without replacing any parts:

Resetting: Unplugging the fridge for 30 minutes can sometimes reset the system and resolve minor glitches.
Cleaning: Regularly cleaning the condenser coils and removing ice buildup are essential maintenance tasks.
Inspection: Thoroughly inspecting for loose components or obstructions can prevent further issues.

When Replacement Might Be Necessary

If the humming persists after troubleshooting, some parts might need replacement. This is a last resort:

Compressor: If the compressor is failing, replacement is expensive, ranging from $300 to $800.
Condenser Fan Motor: $50-$150.
Evaporator Fan Motor: $50-$150.
Water Inlet Valve: $30-$80.

Safety Warning

Always unplug the refrigerator before performing any maintenance or repairs.
Avoid working on electrical components with wet hands or on wet floors.
Be careful when handling sharp objects or tools.

Tools You May Need

Screwdriver (Phillips and flathead)
Vacuum cleaner with brush attachment
Adjustable wrench
Level
Electric motor oil (for lubricating fan motors)

FAQ

Here are some frequently asked questions:

Q: Why is my fridge humming louder than usual?
A: It could be due to a failing compressor, a dirty condenser fan, or ice buildup around the evaporator fan.
Q: Is it safe to ignore a humming fridge?
A: No, it’s best to troubleshoot the issue as soon as possible to prevent further damage.
Q: Can I fix a humming fridge myself?
A: Yes, many times the issue can be resolved with simple cleaning and maintenance.
Q: When should I call a professional?
A: If the humming persists after troubleshooting, or if you are uncomfortable working on electrical appliances, it’s best to call a qualified technician.

Conclusion

A humming fridge doesn’t always mean disaster. By following these troubleshooting steps, you can often identify and resolve the issue yourself, saving time and money. However, if you’re unsure or uncomfortable with any step, don’t hesitate to call a qualified technician. Taking a proactive approach to maintaining your refrigerator will keep it running smoothly for years to come.