The short answer
Level the cabinet and seat the shelves before suspecting the compressor. On a shared Alera the noise almost always follows something being moved: a unit off-level after cleaning, a shelf or drawer not seated, or the cabinet pushed back against a wall. A fan or compressor fault is the least likely of the four and is the only one needing a technician.
What you observe
- A knock each time the cabinet starts — It is rocking on one foot after being moved.
- A buzz that stops when you press a shelf — A shelf or drawer not seated in its supports.
- It started right after the room was cleaned — The unit was pulled out and pushed back.
- The back of the cabinet touches the wall — Vibration passing straight into the building.
- NEAR MISS — a soft gurgle after a cycle ends — Refrigerant settling. Normal.
Causes, most likely first on this class
- Cabinet left off-level after being moved — First because a shared cabinet gets pulled out and pushed back by people who are cleaning, not installing. It lands on a mat edge or a floor joint, rocks, and knocks on every start.
- Shelves, drawers or door bins not seated — Second: a cabinet reorganised weekly by different hands rarely has everything back in its supports, and anything loose buzzes against the liner.
- Cabinet pushed against a wall or cabinetry — Third: breakrooms are cramped, so the unit ends up hard against a partition that carries the vibration into the room beyond.
- Fan motor, compressor or its mounts — Last. Its tell is a noise that survives a levelled cabinet, seated shelves and a clear gap behind, and it needs a technician.
Check in this order, and why
- Rock the cabinet and check each foot — A unit that moves under your hand will knock.
- Press each shelf, drawer and door bin in turn — A buzz that changes is the fitting, not the machine.
- Pull the cabinet clear of the wall and listen — Quieter away from the wall means contact.
- Empty the cabinet and run it briefly — Left until here because it needs the rest ruled out.
What an owner can safely check
- Level the cabinet on its feet until it will not rock — Check all four corners, and watch for mat edges.
Tools: spirit level, adjustable spannerAbout 25 min
- Reseat every shelf, drawer and door bin — Each should sit down into its supports without play.
About 20 min
- Pull the unit forward to leave a clear gap behind — Nothing should touch the back panel or the coil.
About 15 min
- Unload the cabinet and run it briefly — A quiet empty cabinet means the load was the noise.
About 20 min
- STOP HERE if the noise survives an empty levelled cabinet — Fan and compressor work is a service call.
Before you open anything
Safety
Unplug the cabinet before cleaning behind it or removing any panel; a capacitor can hold a charge after the power is off, and an office socket is often behind a counter where nobody can see what is switched. Get help moving a loaded cabinet on a hard floor. Never open a sealed refrigerant line, and never wedge a rattling shelf with packaging that can fall into the fan.
When to call a technician
Call when the cabinet is level, empty, clear of the wall, every fitting is seated, and a mechanical noise remains — the fan motor or the compressor mounts are then the answer. In a workplace, weigh the repair against replacement first. Unplug the cabinet immediately if a noise arrives with a burning smell or a breaker that will not hold.
Nearest pages of this class
What this page does not cover
This page is written for the brand and the appliance class, not for one family or model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer and you should start there. Deliberately absent: cabinet and shelf dimensions, clearance figures, fan and compressor part identifiers and fault-code meanings, all of which differ between the compact, mid-size and glass-door families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
