Fridge Freezer Making Noises
Is my fridge freezer noise normal?
A working fridge freezer is never completely silent. The refrigeration cycle involves a compressor, a fan, refrigerant gas moving through pipes, and a cabinet that expands and contracts with temperature — all of which produce sounds. Many consumers contact engineers about noises that turn out to be entirely normal operation, so the first step is to understand what a healthy fridge freezer sounds like.
A low hum or buzz from the compressor cycling on and off. A gurgling, bubbling, or trickling sound as refrigerant moves through the pipes — particularly noticeable when the compressor first starts or stops. A click when the thermostat switches the compressor on or off. Occasional cracking or popping from the plastic casing as it expands and contracts. A brief hiss when the door seal releases as you open the door. A dripping sound as defrost water drains to the drip tray.
Loud buzzing or vibrating that was not present before. Grinding or scraping sounds, particularly from the back of the appliance. Rattling that continues even when the appliance is not against a wall. Persistent clicking that does not stop after a minute or two. Loud banging or knocking. A high-pitched whining or squealing. Any noise that has changed significantly in character or volume compared with normal operation.
Fridge freezer noises explained: what each sound means
Buzzing or humming
Normal compressor hum
A steady low hum is the sound of the compressor running, which is completely normal. The compressor runs in cycles — typically on for a period then off — and the hum will start and stop accordingly. Modern inverter compressors run more continuously at varying speeds and produce a lower, more consistent hum than older on/off compressors. If the hum has always been present and has not changed, there is nothing to investigate.
Loud buzzing — door seal or levelling issue
A buzzing that is louder than the usual compressor hum, and which may vary when you move or touch the appliance, is often a vibration issue rather than a compressor problem. Check that the appliance is level — an unlevel fridge freezer vibrates significantly during compressor operation. Adjust the feet until the appliance is stable and the noise may reduce or disappear. Also check that nothing stored on top of the appliance is vibrating against it.
Loud buzzing — failing compressor or start relay
A loud buzzing accompanied by the compressor cutting out shortly after starting, or a buzzing that stops and restarts repeatedly over a short period, can indicate a failing compressor or a faulty start relay. The start relay is a small component that provides the initial electrical kick to start the compressor motor. A failing relay is a relatively inexpensive component to replace and is worth checking before concluding the compressor itself has failed. If the appliance is also not cooling, see our guide to fridge not cold enough and our freezer not freezing guide.
Clicking
Normal thermostat click
A single click when the compressor starts or stops is the thermostat switching the compressor on or off. This is completely normal and is one of the most commonly heard fridge sounds. It typically occurs every 15 to 45 minutes as the fridge cycles to maintain temperature.
Repeated clicking — failed start relay
If you hear a repeated clicking sound — click, pause, click, pause — every few seconds or minutes, particularly if the compressor sounds like it is trying to start but failing, the start relay is the most likely cause. The compressor attempts to start, the relay trips because it cannot sustain the current, and the cycle repeats. This is a common fault and a start relay replacement is a relatively inexpensive repair. Left unaddressed, repeated failed start attempts can eventually damage the compressor itself.
Clicking and cracking from the casing
Plastic casings expand when the interior warms slightly and contract when cooling resumes, producing occasional clicking and cracking sounds. This is entirely normal and more noticeable on newer appliances or immediately after a door has been left open for a period, allowing warm air to enter and then the interior to cool back down. If the clicking is from inside the cabinet walls rather than from the compressor area, this is almost certainly normal thermal expansion.
Gurgling, bubbling, or trickling
Normal refrigerant movement
Gurgling, bubbling, and trickling sounds are among the most commonly reported fridge noises that turn out to be completely normal. They are the sound of refrigerant gas or liquid moving through the pipes and heat exchangers of the refrigeration circuit, particularly when the compressor first starts or stops and the refrigerant pressure equalises. These sounds are more noticeable on some models than others and more audible in a quiet room. If the appliance is cooling correctly and the sound has always been present, there is nothing to investigate.
Dripping sound — normal defrost drainage
Most modern fridge freezers defrost automatically. During and after a defrost cycle, water drips from the evaporator coils and runs down to a drip tray at the back of the appliance where it evaporates. The sound of water dripping onto the tray or running through the drain tube is normal and is most noticeable immediately after a defrost cycle completes. If water is pooling inside the fridge or leaking onto the floor, the drain may be blocked — but the dripping sound itself is expected.
Rattling
Items inside or on top of the appliance
The most common cause of rattling is something stored in, on, or immediately next to the appliance. Bottles touching each other inside the fridge, a loose item on a shelf, something resting on top of the appliance, or a neighbouring kitchen unit vibrating sympathetically with the compressor cycle are all frequent culprits. Before assuming a mechanical fault, remove everything from on top of the appliance, check that nothing is touching the back or sides, and listen again during a compressor cycle.
Appliance not level — vibrating feet
An unlevel fridge freezer vibrates noticeably during compressor operation and can produce a loud rattle that appears to come from inside the machine. Check that all four feet are making solid contact with the floor. Most fridge freezer feet can be adjusted by turning them clockwise or anticlockwise. Place a spirit level on top of the appliance and adjust until it reads level both front-to-back and side-to-side. Anti-vibration feet pads placed under the appliance can also significantly reduce transmitted vibration on hard floors.
Condenser fan debris or failure
Many fridge freezers have a condenser fan at the rear or underneath that removes heat from the condenser coils. If debris — dust, pet hair, a small object — has become caught in this fan, it will produce a rattling or scraping noise that is usually constant while the fan is running rather than intermittent. Pulling the appliance forward and inspecting the fan area with the appliance unplugged will confirm if this is the cause. A failing condenser fan motor can also produce rattling or grinding sounds before failing completely.
Ice maker noise
American-style fridge freezers and some fridge freezers with built-in ice makers produce a range of sounds specific to the ice-making cycle — a whirring as the ice maker motor turns, a cracking sound as ice is released from the mould, and a rattling as ice cubes fall into the collection bin. These are all normal operation sounds for an ice maker. If the ice maker has recently been switched on for the first time or after a period of being off, these sounds may be more noticeable until the cycle establishes itself.
Grinding or scraping
Evaporator fan ice build-up
Inside the freezer compartment, an evaporator fan circulates cold air from the evaporator coils around the freezer. If the defrost system has failed and frost has built up excessively on or around the evaporator, this frost can come into contact with the fan blade and produce a grinding or scraping sound as the blade strikes the ice. This is often accompanied by the freezer warming up as airflow becomes restricted. The short-term fix is a manual defrost, but if the automatic defrost system has failed, the frost will return.
Failing evaporator or condenser fan motor
Fan motor bearings wear over time and can produce a grinding, scraping, or high-pitched whining sound as they fail. The noise typically worsens progressively and may be intermittent in the early stages. A grinding fan motor should be investigated promptly — complete motor failure will cause temperatures to rise in the affected compartment.
Banging or knocking
Ice falling in the freezer
A sudden bang or knock from inside the freezer is most commonly the sound of ice breaking loose from the freezer walls or falling from the evaporator coils during a defrost cycle. This is normal and expected. It tends to be more noticeable in frost-free appliances where the automatic defrost runs regularly. If the sound occurs only occasionally and is not accompanied by any change in performance, it is not a fault.
Water hammer from the ice maker water supply
On plumbed-in American-style fridge freezers with ice makers and water dispensers, a banging sound in the pipes when the water valve opens or closes can indicate water hammer in the household plumbing. This is a plumbing issue rather than an appliance fault, though a pressure regulator fitted to the water supply to the fridge can resolve it.
Quick diagnosis: match your noise to a cause
| Sound | When | Most likely cause | Action |
|---|---|---|---|
| Low steady hum | Continuously or in cycles | Compressor running normally | None — normal operation |
| Single click every 15–45 min | Compressor starting or stopping | Thermostat switching compressor | None — normal operation |
| Gurgling or bubbling | When compressor starts or stops | Refrigerant moving through pipes | None — normal operation |
| Occasional dripping sound | After defrost cycle | Defrost water draining to tray | None — normal operation |
| Cracking or popping | Intermittent | Casing expanding and contracting | None — normal operation |
| Loud buzzing or vibration | When compressor runs | Unlevel appliance or loose items nearby | Level the appliance, check surroundings |
| Repeated clicking every few seconds | Compressor trying to start | Faulty start relay | Engineer — start relay replacement |
| Rattling from rear | When compressor or fan runs | Condenser fan debris or unlevel feet | Check and clean fan, level appliance |
| Grinding from inside freezer | Continuous when freezer runs | Ice build-up striking evaporator fan blade | Manual defrost — check defrost system |
| High-pitched whining or squealing | When fan runs | Fan motor bearing failing | Engineer — fan motor replacement |
| Loud bang from inside freezer | Occasional | Ice falling during defrost cycle | None — normal in frost-free appliances |
| Ice maker whirring and cracking | Periodically | Normal ice-making cycle | None — normal operation |
Step-by-step checks before calling an engineer
Step 1: Identify where the noise is coming from
Stand close to the appliance and try to locate the source of the noise as precisely as possible. Is it from the back of the machine (likely the compressor or condenser fan)? From inside the fridge compartment (items vibrating, casing expansion)? From inside the freezer (evaporator fan, ice)? From underneath (compressor, drip tray)? Knowing the location narrows the diagnosis significantly.
Step 2: Check levelling
Pull the appliance slightly forward and check that all four feet are making firm contact with the floor. Adjust the front feet by turning them until the appliance is stable and level. An unlevel fridge freezer is a very common source of buzzing and rattling that is frequently misidentified as a mechanical fault. After adjusting, push the appliance back gently, ensuring it is not in contact with the wall or kitchen units at the rear.
Step 3: Check the surroundings
Remove everything from the top of the appliance and ensure nothing is touching the sides. Check inside the fridge that bottles and containers are not in contact with each other in a way that causes rattling. Pull the appliance forward slightly to ensure the back is not touching the wall — a gap of at least 50mm at the rear is recommended for most models.
Step 4: Clean the condenser coils and fan area
With the appliance unplugged, pull it forward and inspect the condenser area at the back or underneath. On models where the condenser coils and fan are accessible, dust and debris build-up is common and can both cause rattling and reduce cooling efficiency. Vacuum the condenser coils and fan area gently using a soft brush attachment. Plug the appliance back in and listen for whether the noise has reduced.
Step 5: Check inside the freezer for frost build-up
If the noise is a grinding or scraping sound from inside the freezer, open the freezer and inspect the rear wall for excessive frost build-up. If frost has accumulated heavily — particularly on or around the evaporator cover at the rear of the freezer — carry out a manual defrost. Remove all food, switch the appliance off, and leave the door open until all frost has melted. If the frost returns within a few weeks after manual defrosting, the automatic defrost system has likely failed and will need an engineer.
When does a noisy fridge freezer need an engineer?
Loud buzzing or vibration — level the appliance and remove items from on top. Rattling — check condenser fan for debris, check levelling. Grinding from freezer — manual defrost and monitor. Dripping or gurgling — normal operation, no action needed. Cracking or clicking — normal thermal expansion or thermostat switching.
Repeated clicking every few seconds — failing start relay. Loud buzzing with compressor cutting out — start relay or compressor fault. Grinding that persists after manual defrost — defrost system failure. High-pitched whining from fan — motor bearing failure. Any noise accompanied by loss of cooling in either compartment.
If the noise is accompanied by the fridge or freezer not maintaining its correct temperature, the fault is more urgent. See our guides to fridge not cold enough and freezer not freezing alongside this article.
Noise not explained by these checks?
If levelling, cleaning, and defrosting have not resolved the noise, a component fault such as a failing start relay, fan motor, or defrost system is likely. Our engineers cover fridge freezer repairs across all major brands nationwide, and we stock genuine spare parts including fan motors, start relays, and defrost components for most models.
Frequently asked questions about a noisy fridge freezer
Is it normal for a fridge freezer to make noise?
Yes. A working fridge freezer is never completely silent. Normal sounds include a low hum from the compressor, a single click when the thermostat switches the compressor on or off, gurgling or bubbling as refrigerant moves through the pipes when the compressor starts or stops, occasional cracking from the plastic casing as it expands and contracts with temperature changes, and a dripping sound after a defrost cycle. The sounds that warrant investigation are loud buzzing, grinding, repeated clicking, persistent rattling, or high-pitched whining that were not previously present.
Why does my fridge freezer make a clicking noise?
A single click every 15 to 45 minutes is the thermostat switching the compressor on or off — completely normal. If you are hearing repeated clicking every few seconds, particularly accompanied by the compressor humming briefly and then stopping, the most likely cause is a failing start relay. The relay is a small, inexpensive component that provides the initial electrical start to the compressor motor. When it fails, the compressor tries to start, fails, and tries again, producing the repeated clicking pattern. This should be investigated promptly as repeated failed start attempts can damage the compressor over time.
Why is my fridge freezer suddenly louder than it used to be?
A sudden increase in noise volume usually indicates something has changed mechanically or environmentally. Common causes include the appliance having moved slightly so it is no longer level or is touching a wall or unit, something new placed on top of or touching the appliance, dust build-up on the condenser fan causing it to work harder, or a component beginning to fail. Check levelling and surroundings first, clean the condenser area, and if the noise persists after these checks, a mechanical fault is likely.
What is the grinding noise from inside my freezer?
A grinding or scraping sound from inside the freezer compartment is most commonly caused by ice build-up striking the evaporator fan blade. This happens when the automatic defrost system fails and frost accumulates progressively until it makes contact with the spinning fan. Carry out a manual defrost — remove all food, switch the appliance off, and leave the door open until all ice has melted — and the grinding should stop. If it returns within a few weeks, the defrost heater, defrost thermostat, or timer has failed and will need replacement by an engineer.
My fridge freezer makes a gurgling sound — is this normal?
Yes, in almost all cases. Gurgling, bubbling, and trickling sounds are the sound of refrigerant moving through the sealed pipe system of the refrigeration circuit, particularly when the compressor starts or stops and pressure equalises across the system. These sounds are completely normal and are more audible in some models than others, particularly in quiet rooms or at night. If the gurgling is accompanied by loss of cooling, the refrigerant system may have a leak, but the sound alone is not a cause for concern.
Should I be worried if my fridge freezer is making noise at night?
Fridge freezers are often most noticeable at night because the ambient noise level in the house drops. The sounds themselves are typically no different from daytime operation — the compressor cycling, refrigerant moving through pipes, and occasional thermal expansion of the casing are all normal. If the noise is specifically waking you up and has recently become louder, check that the appliance is level and that nothing is vibrating against it. Anti-vibration pads under the feet can significantly reduce transmitted noise on hard floors.
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