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For the Alpicool KM family, noise or vibration is usually refrigerant flow noise through the metering line rather than anything deeper in the machine. The order below is this family's own, and it is not the order the brand-generic article sets out. Of the causes listed here, all but one are owner-checkable, and debris drawn onto the condenser or its fan is the one worth ruling out immediately after the first.
What this looks like on a KM unit
- A hum that is louder against one wall than another — Clearance and what the unit is standing on both change what you hear.
- A rapid clicking with no run following it — The cabinet warms while this happens, so it is not only a noise.
- The unit walks on its feet — Vibration that moves the cabinet is a mounting problem before it is a mechanical one.
- A gurgle shortly after the unit stops — Usually normal, and worth ruling out before anything is opened.
- A noise that changes when the door is opened — Anything that goes quiet with the door open is on the cold side.
- A KM unit of a different size behaves identically — That is what a shared build looks like: the members of this ladder differ in scale rather than in arrangement.
- NEAR MISS — water running inside the cabinet — Meltwater finding the drain is normal; water on the floor is the leak page.
Causes, most likely first on the KM family
- Refrigerant flow noise through the metering line — It is the first thing to rule out on these models. It follows the run cycle exactly, and no amount of levelling or cleaning changes it.
- Debris drawn onto the condenser or its fan — It follows the lead on these models. A bag, a leaf or a hank of pet hair against the blade makes a flutter that comes and goes with the run cycle.
- Tubing touching the cabinet or another line — It comes after the two above it. It appears after a unit has been moved, because a line only needs to shift a finger-width to start it.
- A failing compressor — It ends the list. This is the one cause on the list that no amount of levelling, cleaning or reseating will change.
- Body: The brand-generic article on this symptom opens on a cabinet that is not sitting flat on its feet. Here it does not: refrigerant flow noise through the metering line has moved above it, and a cabinet that is not sitting flat on its feet has moved down the list. What moved it is how this family is laid out across the entries in its own table.
Check in this order, and why
- Note whether the sound survives a full cycle — Flow noise follows the cycle exactly and ignores everything you do to the cabinet.
- Pull the unit out and look behind the grille — Whatever the intake has drawn in is visible without a tool, and clearing it is a minute of work.
- Run a finger along each line where it passes the cabinet — Contact points are found by hand faster than by ear.
- Place a hand on the compressor housing itself — A grinding felt through the shell is inside the sealed part and ends the owner-side list.
- Body: Confirm which of the two KM models you have first. The order below holds for both, but the access differs enough that guessing costs time.
Safety first
Safety
Power off first, every time. Unplug the appliance or switch off its breaker before removing a panel, since a capacitor can hold a charge after the power is off. Do not tape or bridge the door switch to keep a fan running while you look. An interlock that is defeated is a blade that turns while a hand is in the cabinet. Anything on the sealed side belongs to a licensed technician. That line does not move because a fault is small or a part looks accessible.
Models in the KM family
Reference| Model number | Family key |
|---|---|
| KM15 | alpicool:refrigerator:km |
| KM20 | alpicool:refrigerator:km |
When to call a technician
What separates the two halves of this list is access, not difficulty. Work down the checks above first; they cost minutes and they remove most of this list. Call once they have all come back clean, because what is left is a failing compressor, and that is where the list stops being owner work. Skip the rest of the list and call if the unit is tripping protection repeatedly. A circuit that keeps opening is telling you something the checks above cannot.
Other KM pages
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