Refrigerator making noise: which sounds are normal and which aren't

A refrigerator making noise isn’t automatically a refrigerator in trouble. A working unit hums, clicks, gurgles, pops and sizzles over the course of a day. The sounds worth worrying about are new ones, louder versions of familiar ones, and anything that grinds, squeals or knocks. Pin down where the sound comes from and you’re usually down to one or two parts.

Normal sounds you can ignore

• A steady hum or drone. The compressor and fans running. Newer variable-speed compressors run longer at lower speeds and can make a softer, higher whine that rises and falls. That’s by design.
• Gurgling or trickling. Refrigerant moving through the tubing, often right after the compressor starts or stops.
• Sizzling or hissing. Water dripping from the cooling coil onto the warm defrost heater. It stops when the defrost cycle ends.
• Pops and cracks. Plastic liners and shelves expanding and contracting as temperatures shift, especially around a defrost.
• A single click. A timer, relay or thermostat switching at the start or end of a cycle.
• Running water, then a clatter. The ice maker filling, and later dropping fresh cubes into the bin.
• A short buzz with water flowing. The inlet valve opening for a few seconds to fill the ice maker.

A new refrigerator will sound different from the one it replaced, and any refrigerator seems louder in a quiet kitchen at night. Give a new unit a couple of weeks before deciding something’s wrong.

Refrigerator making noise: sounds that point to a problem

Sound	Where it comes from	Usual cause	What to do
Scraping, grinding or a rattling chirp	Inside the freezer, back wall	Evaporator fan blade hitting ice	Look for frost; often a defrost problem
Squeal that stops when the freezer door opens	Inside the freezer	Worn evaporator fan motor	Replace the fan motor
Squeal, rattle or ticking	Bottom back	Condenser fan bearing, or debris in the blade	Unplug and clear debris; replace if stiff
Loud buzz, no water coming in	Bottom back	Inlet valve with no water supply	Turn off the ice maker or restore water
Knock or bang at start or stop	Bottom back	Hardened compressor mounts or internal wear	Call a technician
Click, hum, click every few minutes	Compressor area	Start relay, overload or compressor	Call a technician
Rattle or vibration	Underneath	Loose drain pan or kickplate, unlevel cabinet	Reseat parts and level

Find the sound first

1. Open the freezer door. On most models the evaporator fan stops when the door opens. If the noise stops too, it’s that fan or something the blade is striking. Press the door switch to restart the fan and confirm.
2. Listen low at the back. The compressor and condenser fan sit in a compartment behind a thin panel at the bottom of the back. A lower sound clearly coming from behind the cabinet starts here.
3. Note the timing. Noise only while the compressor runs points to the compressor or condenser fan. Noise only when the ice maker fills points to the inlet valve.
4. Rule out the easy stuff. Bottles touching the back wall, a loose kickplate, or a drain pan out of place can all rattle. Make sure the cabinet isn’t touching the wall or the cabinets beside it.

Freezer fan hitting ice

A scraping, ticking or chirping inside the freezer that stops when you open the door is one of the noises we hear described most. Frost or ice has built up around the evaporator fan, and the blade is clipping it. Sometimes the ice comes from a door left ajar or a blocked drain. Just as often it’s the first sign that the defrost system is failing.

A manual defrost will quiet it for now: unplug the refrigerator, empty the freezer, and let it thaw completely with the doors open. If the noise returns within a couple of weeks, the defrost system needs to be checked. Our freezer frost buildup guide covers what to look for.

Unplug before removing any panel inside the freezer. The fan can start on its own when a defrost cycle ends, and the area behind the panel holds a heater and wiring.

Fan motor bearings

A worn fan motor usually starts with a squeal or chirp that comes and goes, then becomes constant over days or weeks. The evaporator fan is inside the freezer. The condenser fan is at the bottom back, on models with coils under the cabinet. Both are ordinary component repairs. Don’t ignore them, though: a fan that stops spinning turns a noise problem into a cooling problem.

To check the condenser fan, unplug the refrigerator, remove the rear access panel, and look for lint, pet hair or debris caught in the blade. Spin it by hand. A blade that drags, wobbles or feels gritty means the motor is on its way out.

The water inlet valve

A loud buzz or hum from the bottom back, lasting several seconds, usually means the inlet valve is opening. If the ice maker is on but the refrigerator isn’t connected to water, or the supply valve is closed, the inlet valve buzzes every time it’s called. Switch the ice maker off if you don’t use it. If the water is on and the valve still buzzes hard while the water barely trickles in, the valve may be failing.

Compressor noises

A compressor that knocks or bangs as it starts or stops may have worn internal parts. Sometimes the cause is simpler, like rubber mounting grommets that have gone hard, and a technician can tell the difference. Clicking every few minutes without the compressor starting is a starting problem: the start relay, the overload, or the compressor itself. Neither is a homeowner repair. Diagnosing them involves live voltage, and the compressor belongs to the sealed refrigerant system.

When to call a technician

• Grinding or scraping in the freezer that comes back after a full defrost.
• A squealing fan that’s getting worse, or one that has stopped turning.
• Knocking, banging, or repeated clicking from the compressor.
• Any new noise that arrives along with rising temperatures in either section.
• A burning smell, or a buzz from the control area. Unplug the refrigerator right away.

Record a short video of the noise on your phone before you call. Hearing it, and knowing where you stood when you recorded it, helps a technician bring the right part. If the refrigerator is also running warm, our refrigerator not cooling guide walks through the next checks.