All fridges make noise – it’s a sign they’re working. But there’s a difference between the normal sounds of a functioning appliance and noises that point to something that needs attention.
In this guide, we’ll walk you through both. We look into which noises are completely normal, what warrants a closer look, and some simple checks you can do yourself before deciding whether a repair or replacement fridge or fridge freezer is needed.
Here’s everything you need to know.
Some fridge noise is completely normal
Before we jump into troubleshooting, it’s worth knowing that modern fridge freezers are actually noisier in some ways than older models. Before you worry, this doesn’t mean they’re worse. It’s actually because they’re more sophisticated.
Back in the day, older appliances ran their compressors at a constant speed, resulting in a steady background hum that most people stopped noticing because it was constant. Today’s fridge freezers use variable-speed compressors and multiple fans that adjust based on internal temperature. This means the appliance is actually quieter overall, but when it does ramp up, for example, to cool down after you’ve opened the door or to compensate for a warm room, the change is more noticeable. A sudden whirring or increase in hum that catches your attention isn’t necessarily a new problem – it’s just more noticeable than the continuous hum of an older model, which you’d probably tuned out.
Some noises are simply part of normal operation:
- Humming is usually the sound of the compressor running and is perfectly normal. You may notice it more at night, simply because the house is quieter.
- Hissing or gurgling sounds are usually the refrigerant moving through the cooling system and are normal.
- Popping or crackling sounds can happen when the plastic interior of an appliance expands and contracts during the temperature cycles. This is normal and can be more common in auto-defrost models.
- Clicking sounds are usually the thermostat switching the compressor on and off and are normal.
- Whirring sounds come from the evaporator or condenser fans running – again, this is normal.
If your fridge has always made these noises and nothing else has changed, it’s usually just the appliance doing its job and isn’t something to worry about.
Why is my fridge louder than usual?
Of course, sometimes noises are a cause for concern. If the noise is brand new or noticeably louder than it used to be, that points to the appliance working harder than it should.
Here are the most common reasons that could be happening and what to do about them.
Is the fridge level?
If your fridge has been making noise since you got it, or started after being moved, check that it’s sitting level on all four feet. An unlevel fridge vibrates against the floor and can cause rattling or buzzing that has nothing to do with the mechanics of the appliance itself. Most fridge freezers have adjustable feet, so check your manual for how to set them. A spirit level is the easiest way to verify.
Is there ice build-up?
One of the most common causes of increased fridge freezer noise – particularly grinding, rattling, or loud buzzing – is ice forming on the evaporator fan. When ice builds up around the fan blades, they can’t spin freely, causing noise and reducing efficiency. If your fridge is running louder than usual, this is the first thing to check.
To rule it out, defrost your fridge freezer fully, allow it to dry out, and restart it. If the noise disappears or reduces significantly, ice build-up was the likely cause.
Is it over or under-filled?
Both extremes can make your fridge freezer work harder.
- Overfilling restricts airflow inside the appliance, making it harder to maintain an even temperature. The compressor compensates by running longer and harder – and noisier!
- An empty or near-empty freezer is particularly problematic. Frozen items help retain cold – an empty freezer has to work continuously to keep the space at a cold temperature.
A well-stocked fridge freezer – roughly two-thirds full – runs more quietly and efficiently than one that’s crammed or nearly empty.
Are the condenser coils dirty?
The condenser coils, which are usually at the back or underneath your appliance, release heat from the refrigeration cycle. When they’re dirty, covered in dust or debris, the compressor has to work harder to do its job – and that means more noise, more heat, and more wear. Gently vacuuming or brushing the coils once or twice a year can make a noticeable difference to both noise levels and efficiency.
Make sure there’s adequate space around the appliance for ventilation too – at least a few centimetres at the sides and rear. A fridge pushed hard against a wall or enclosed without airflow will run warmer and noisier.
Is it vibrating against something?
Sometimes the noise coming from your fridge isn’t mechanical at all. Items inside the fridge rattling against each other, bottles touching shelves, or the appliance vibrating against a cabinet can all make noises that sound alarming, but are actually easily fixed. Check that nothing inside the fridge or freezer is in contact with the back wall, and that the fridge isn’t pressed against adjacent cabinetry.
If the appliance is sitting on a hard floor and the vibration is noticeable, appliance anti-vibration pads (sometimes called furniture pads) placed under the feet can help dampen the noise. These are inexpensive and widely available. They won’t fix a mechanical issue, but they can reduce transmitted vibration noise on hard flooring.
When to be concerned about fridge noises
Some noises go beyond normal operation and may indicate a faulty component that needs attention. If you’re noticing any of the following, it may be worth checking with your manufacturer or a professional.
Loud or persistent grinding
A grinding noise – particularly from the freezer section – often points to the evaporator fan struggling. Ice build-up is the most common cause (see above), but if defrosting doesn’t resolve it, the fan motor itself may be failing.
Loud knocking or banging
Occasional knocking as the compressor starts or stops can be normal. Persistent or loud banging is less so, and may point to a failing compressor or loose components. This is worth having looked at by a professional.
Rattling from the back of the appliance
A rattle from the rear of the fridge can indicate a loose drain pan, loose pipe, or issue with the compressor. These are often simple fixes, but should be diagnosed by a technician.
Noise that’s getting progressively worse
A steady increase in noise over time – rather than a sudden change – usually means a component (most often the compressor or a fan motor) is gradually wearing out. If the appliance is older than 8–10 years, this is a useful signal to start thinking about replacement.
Should I unplug my fridge if it’s making a loud noise?
Understandably, loud noises can be concerning when large electrical appliances are involved. For most of the noises we’ve discussed, though, there are no immediate safety concerns. If you’re noticing humming, buzzing, whirring, or even grinding sounds, unplugging the appliance isn’t necessary.
However, there are some situations where switching the appliance off and calling a professional is the right call.
- A burning smell accompanying the noise suggests an electrical issue, and the appliance should be switched off immediately.
- The appliance feels hot to the touch in places it shouldn’t – not just the condenser coils, but the sides or door area.
- Sparking or visible signs of an electrical fault mean you should switch off the appliance at the socket and not use it until it’s been inspected.
Fridge freezers are not typically a fire hazard under normal operation, but faults in the compressor or electrical components can pose a risk if left ignored for a long period. If you have any concerns about burning smells or unusual heat, don’t ignore them.
Fridge noises: A troubleshooting checklist
To determine whether you need an engineer, repair, or even a replacement, first work through these steps:
- Check that the appliance is level and adjust the feet if needed
- Check for ice build-up. Fully defrost and restart to see if the noise improves
- Check the fill level. Avoid running the appliance empty, and don’t overpack the fridge
- Check the condenser coils – vacuum if dusty and ensure there’s space for ventilation around the appliance
- Check for contact noise, ensuring items inside aren’t rattling, and the unit isn’t vibrating against cabinetry
- Try anti-vibration pads if vibration on hard flooring is the issue
If you’ve tried the above and you’re still having issues with loud noise, it’s likely a mechanical issue that needs to be fixed professionally.
When should I repair vs replace a fridge freezer?
If your fridge freezer is under 8 years old and has developed a fault, repair is usually the right first step – assuming the repair cost is reasonable when compared to the appliance’s value. Many component faults (including fan motors, thermostats, and door seals) are straightforward and affordable to fix.
Once an appliance is past the 10-year mark, it may be time to consider a replacement. Repair costs can approach or exceed the cost of a replacement, and older appliances are less energy-efficient – meaning a new A-rated model could offset its purchase cost in energy savings within a few years. If your fridge freezer is old, consistently noisy, and starting to require repairs, replacement is often the smarter long-term investment.
If you’re looking for a new model, browse our full range of fridge freezers at Cookology – including quiet, energy-efficient models – to find the right appliance for your home.
