Troubleshooting
A refrigerator that has started making a noise
Where the sound is coming from narrows it down faster than what the sound is like — so before anything else, work out whether it is behind the base grille, inside the freezer, or somewhere at the back of the cabinet.
Behind the base grille
A rattle, a buzz, or a fan that has become audible
Most new noises on a built-in come from here, because this is where the condenser, its fan and the compressor live. A rattle that changes if you touch the grille is usually the grille itself or a drip tray vibrating against the frame. A buzz that rises and falls with the compressor is often a mounting grommet that has hardened. A whine or a whirr that was not there last month is a condenser fan whose bearings are going.
A related and very common one: something has got into the fan. Dust bound into a mat, a stray wrapper, a length of pet hair around the hub — the blade clips it on every revolution and produces a regular tick that people describe as a card in bicycle spokes.
Inside the compartments
Chirping, scraping, and a noise that stops when you open the door
A rhythmic chirp or scrape from inside the freezer is the evaporator fan touching ice. Frost builds on the coil, encroaches on the blade, and the blade shaves it once per turn. On many units that fan stops when the door is opened, so a noise that vanishes the moment you open up and returns a few seconds after you close is close to a confirmation.
Ignore it and the same frost is also blocking airflow, which is why this one tends to arrive alongside a compartment that has started to lose temperature.
Knocking or a short thump on a schedule — every few hours, always brief — is usually the ice maker: the fill valve opening and the water line jumping against the cabinet behind it. Harmless in itself, though a line clipped properly makes it stop.
What you can check
Safe to do, in this order
None of this needs tools beyond a torch, and none of it involves going behind the appliance.
- Stand still and place the sound: base grille, freezer interior, or the back of the cabinet
- Open the freezer door and listen for whether the noise stops, then closes and returns
- Look through the base grille with a torch for a matted condenser or something caught in the fan
- Note whether the noise keeps time with the ice maker filling, which happens a few times a day
- Switch the appliance off at its own control, or unplug it, before anything is removed or reached into
When to stop
Two noises worth a call rather than an experiment
A loud metallic grinding or a knock from the compressor area, especially one accompanied by the unit failing to start or starting and stopping repeatedly. And any new noise arriving at the same time as a compartment losing temperature — the noise is then a symptom of the cooling fault rather than a separate nuisance, and the two want diagnosing together.
Everything else can wait for a scheduled visit rather than an emergency one.
Also asked
Three that follow on
The noise only happens at night. Why?
It almost certainly happens all day too. A kitchen at two in the morning has none of the background noise that masks a condenser fan or a vibrating drip tray, and a house that has cooled overnight lets the sound carry further. A noise that genuinely appears on a schedule is more likely the ice maker filling or a defrost cycle running.
Is a humming refrigerator normal?
A steady hum is the compressor doing its job and is normal. What is worth attention is a hum that never stops — a compressor that no longer cycles off is working against something, usually a loaded condenser, a door that has stopped sealing or a coil under frost.
Can I just unplug it overnight to make it stop?
You can, and with a freezer full of food you should not. Cutting power stops the noise and stops the cooling with it, and a built-in takes many hours to pull back down once it has warmed. If the noise is intolerable, switch it off at the appliance controls only long enough to confirm the sound goes with it, then restore power.
Book it
Tell us what it is doing and we will tell you what it costs.
A flat $95 service call covers the visit and the diagnosis, and comes off the bill when you approve the repair. The line is answered 24/7; visits run 8:00 am – 8:00 pm, seven days.
- One number, quoted once
- Parts and labour arrive as a single figure before anything is opened up.
- Diagnosis you can see
- Temperatures, defrost behaviour and airflow are read in front of you.
- Independent
- An independent service business working on Sub-Zero refrigeration, with no manufacturer affiliation of any kind.
