It is usual for electrical or motorized appliances to produce a humming sound. Like freezers and refrigerators, they almost work in the same way and are built with similar parts. Their mechanism allows for certain noises that we thought weren’t normal to our ears.
Loose parts usually cause loud humming sounds coming from your freezer. Though the compressor and condenser are running, you will sense a vibration when you hear the nature of the sound.
The vibration is not a problem because that is how freezer motors should sound when they are running. But if the fan stops spinning, the compressor will struggle to perform its job, thus the humming noise. The interrupted process will cause overheating.
Let us find out why this is happening.
Freezer Compressor Noise, is it Dangerous?
A freezer has a compressor that does its job in refrigeration in helping the unit keep the cold temperature inside.
Electricity powers the freezer compressor, working in harmony with the evaporator coil for heat and cold transfer. For this to work, you need to understand the role of the condenser.
The condenser fan regulates the condenser fan motor.
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The condenser coil you see outside your freezer and refrigerator units is what we call the condenser. To understand this better, read on:
- If there is a condenser, there is an evaporator, and you can find it inside.
- In simple science, the condenser is vital to the cooling system with the help of the compressor.
- That’s why we get a freezing temperature inside the freezer.
PRO TIP: Lack of maintenance for your freezer or refrigerator will lead to severe problems.
A loud buzzing noise is a warning sign that there is something wrong with the unit’s mechanism. Worse is when the sound becomes more audible, and both sides of the unit are hot. And this is dangerous.
What is it, and how can you fix it?
Why Is My Freezer Making a Loud Humming Noise: How Condenser Coils Function
You can find the condenser coils at the back of your refrigerator or freezer. The coils covered with encrusted dust cause the buzzing and humming noise.
The coils clogged with dirt can’t work efficiently to cool down the inside of the unit. Thus, producing a loud noise as they try to release heat.
PRO TIP: Dirty condenser coils will make a strange noise, and if the unusual sound does not stop, turn off the unit, remove the plug from the outlet and start cleaning.
Common Freezer Noise and Solutions to Make the Freezer Quiet
When you think your freezer is cooling just fine but suddenly makes a noise and never stops, you will wonder what’s causing the escalating sound.
Nobody loves a noisy refrigerator.
Below are everyday freezer and refrigerator noises and tips to solve them:
1. Freezer Making Noise and Thawing
The primary role of the freezer is to freeze food and keep them from spoiling. But when your freezer stops freezing, it could be any of the following:
- Faulty or dirty condenser coils, most likely the condenser coils are faulty and hampers your freezer’s cooling capacity.
- Malfunctioning evaporator fan.
- Excessive defrosting.
- Faulty defrost timer.
Frost-free refrigerators keep food fresh longer than usual. Ensure that the defrost heater functions well on your frost-free unit.
Popular brands in freezers and fridge, like a GE refrigerator or a Samsung refrigerator, are efficient, spacious, use less energy, and minimize loud refrigerator noise. Or opt for a sub zero refrigerator for the most efficient freezing and cooling capacity.
How do you fix these?
- Avoid frequent opening of the freezer compartment door.
- Keep the thermostat up to compensate for the low temperature.
- There shouldn’t be any gaps to seal the freezer door correctly.
2. Freezer Making Noise and Not Cooling
Similar to the above freezer issue, your freezer may not cool as expected and is making noise. It could be the condenser fan’s fault.
The condenser fan works in harmony with the evaporator motor and compressor. If one fails, it will affect the function of the rest. This will cause the unit appliance to turn on and off and will damage the motor.
3. Freezer Evaporator Fan Noise
If there is a loud buzzing sound from your freezer, it could be an evaporator fan blade failure. The fan blade could be damaged or worn out.
Typically, the fan is secured to a shaft with a spring clip. If unclipped, remove the fan blade from the motor shaft and replace it with a new one. Make sure to plug off the appliance before attempting to disable the evaporator fan in the freezer.
4. Freezer Compressor Noise
Compressors producing loud buzzing sounds are not a part of their regular operation. Call your technician right away to check and fix the problem. Compressor repair is not a DIY solution.
5. Freezer Making a Sizzling noise
Blame the evaporator motor. This freezer component helps the freezer fan to circulate air so that the evaporator can do its job. When you hear a sizzling and clicking noise, it means that the parts are worn out, loose, or need lubrication.
Time to replace the Evaporator Fan Motor:
- Turn off the unit.
- Unplug the power source.
- Remove the grille or cover.
- Remove the wires connectors to the source.
- Remove the mounting screws.
- Acces the motor and replace it with a new one.
Quick Fixes to Solve the Freezer and Fridge noise
- Clean the compressor and fan.
- Ensure tight sealing of fridge freezer doors.
- Move the noisy fridge to an air-conducive space where heat can conveniently dissipate.
- Add an acoustic foam beneath the unit to reduce floor vibrations.
- Avoid frequent opening and closing of the refrigerator door.
- Check the drain pan from time to time.
Above all, if you hear a loud sound—humming, sizzling, whirring, buzzing, beeping, or clicking—it only means one thing—there could be a problem. Sometimes, a knocking noise could be heard. It is a little different with a popping noise or a rattling noise.
PRO TIP: No matter how simple or complex the problem of the freezer unit is, the first and most intelligent thing to do is to diagnose the problem.
How will you diagnose without being an expert?
- Check if the temperature matches the setting.
- Plug off the unit to the power source and wait for an hour to rest it. Turn it on and see if there is overheating.
- Check the evaporator fan.
- See if the freezer defrosts normally.
- Inspect if the freezer ice maker still makes ice.
- For leaks, check the water inlet valve and replace it. Refrigerators equipped with an ice maker, Whirlpool refrigerator. Water from faulty ice makers overflows and causes a noisy refrigerator.
If simple troubleshooting doesn’t do the trick, your freezer has a serious problem and needs to be brought for repair.
Get a licensed technician. Or, if your appliance is still under warranty, call your provider and have it diagnosed by a certified technician.
Don’t gamble on expenses. Besides, if you want your freezer to serve you for many more years, learn to take care of it and always be aware of things before serious trouble gets out of hand.
Robert is an electronic engineer with more than five years of experience with a solid affinity for helping people reduce noise. He writes about these silent home appliances and easy soundproofing measures to help everyone avoid the negative effect of extended exposure to high noise levels.