The short answer
A Comptree compact refrigerator that has started making an unfamiliar noise is most often a loose drip tray or a loose back panel, with something the cabinet is resting against close behind. Comptree cubes are sold for offices and dorm rooms, so they spend their lives being opened a dozen times an hour and shut again on a bag or a bottle. That order is what this page is for, because working it the other way round is how an afternoon gets spent on the least likely cause.
What you observe
- A buzz or rattle whenever it is running — It starts and stops with the compressor, which is the clue.
- Gurgling or a trickle after it stops — Refrigerant settling and meltwater running. Normal, and not what this page is about.
- NEAR MISS - a grinding or screeching that rises and falls — Stop and unplug it. That is a bearing or a blade, and running it on turns a part into a repair.
Causes, most likely first on this brand
- A loose drip tray or a loose back panel — First on this cabinet: the tray rests in clips and the rear panel is held by a handful of screws, and either one buzzing against the shell sounds far worse than it is.
- Something the cabinet is touching — Second, and close behind: a cube weighs little and vibrates constantly, so a wall, a desk leg or a bottle resting against the shell turns a hum you would not notice into a buzz you cannot ignore.
- A cabinet standing unevenly — Third: on three feet instead of four the whole shell rocks each time the compressor starts, and a soft floor or a carpet tile is enough to do it.
- The compressor or its mounts — Last, and that is the whole point of the order: it is last because a compressor that is noisy but still cooling is usually just an old compressor on tired rubber mounts, and that is a judgement rather than a repair.
Check in this order, and why
- Check the tray and the rear panel for anything loose — Loose metal buzzes at exactly the pitch people report as a failing compressor.
- Pull the cabinet away from everything it touches — The likeliest cause, and it is settled in a minute with no tools.
- Rock each corner and watch whether it moves — Second because it is nearly as common and just as cheap to rule out.
What an owner can safely check
- Check the drip tray is seated and the rear panel screws are tight — Loose sheet metal is the loudest cheap fault there is.
Tools: screwdriver, torchAbout 15 min
- Pull the cabinet clear of the wall and anything beside it — The commonest fix on this page, and it needs nothing but a minute.
About 10 min
- Rock each front corner and adjust the feet until it sits solid — A cabinet that rocks on the diagonal will buzz every time the compressor starts.
Tools: spirit levelAbout 15 min
- STOP HERE if the noise is grinding, screeching or metallic — That is a moving part failing. Unplug it and stop, rather than running it to see what happens.
Before you open anything
Safety
Unplug the cabinet before taking the rear panel off or reaching behind it to tighten anything; a capacitor can hold a charge after the power is off. If the noise is grinding or screeching, unplug it and leave it unplugged - a blade or a bearing failing is the one noise on this page that gets worse with every hour of running.
When to call a technician
Call when the cabinet is standing free and solid, the tray and the panel are secure, and a new mechanical noise is still there. Call immediately, and stop using it, for grinding, screeching or any noise that arrives with a burning smell.
Nearest pages of this class
What this page does not cover
This page covers compact single-door refrigerators as a class rather than a model line. Fan arrangements, panel fixings and mount types differ by family, and where a family- or model-specific page exists for your unit it is linked below and is the more specific answer. Not here on purpose: part identifiers and sound ratings.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
