The short answer
A noisy ABL commercial cabinet is usually telling you about its condenser: a grease-bound coil makes the fan work harder and louder while cooling less. Worn fan bearings come second, because they accumulate hours far faster here than in a home. Cleaning the condenser and levelling the cabinet are owner-side work; a bearing or a compressor mount is a service call.
What you observe
- A rising whirr from the machine compartment — The condenser fan labouring against a dirty coil.
- A constant-pitch squeal that survives cleaning — A dry fan bearing. It will not improve on its own.
- A buzz that changes when you lean on the cabinet — Panels or castors resonating on an uneven floor.
- The unit runs almost continuously as well as noisily — Cooling and noise are the same fault: restricted airflow.
- NEAR MISS — a rhythmic tick from inside the cabinet — That is the evaporator fan, not the machine compartment.
Causes, most likely first on this class
- Condenser coil bound with grease and dust — First in a commercial kitchen because airborne grease turns ordinary dust into a mat that will not blow off. The fan works harder, gets louder, and the cabinet runs longer — one fault, two symptoms.
- Condenser or evaporator fan bearing worn — Second: these fans run close to continuously here, so they reach the end of their bearing life in a fraction of the time a domestic fan would.
- Cabinet rocking on castors or an uneven floor — Third, and free to correct. Every door slam sets the cabinet moving, and a panel touching neighbouring equipment buzzes loudly.
- Perished compressor mounting grommets — Last. Real on a high-hours cabinet, but it produces a low rumble rather than the whirr or squeal that brings most of these calls.
Check in this order, and why
- Look at the condenser coil for a grease mat — Top cause, visible without tools, and it also costs you cooling.
- Decide whether the noise is inside or in the machine compartment — Two different fans, two different jobs.
- Rock the cabinet and check the castor brakes — Free, and it explains most buzzing in a busy kitchen.
- Note whether a squeal survives a clean coil — Left until here because it is what separates dirt from bearing.
What an owner can safely check
- Isolate the cabinet and inspect the condenser — Look for a grey mat of grease-bound dust across the fins.
Tools: torchAbout 10 min
- Degrease and vacuum the condenser coil — Work with the fins, not across them. Let it dry before restarting.
Tools: degreaser, vacuum, soft brushAbout 40 min
- Level the cabinet and set the castor brakes — It should not rock under a firm push at the top corner.
Tools: spirit levelAbout 20 min
- Check clearance to neighbouring equipment — A panel touching a bench buzzes loudly for no reason.
About 10 min
- STOP HERE if a squeal survives a clean coil — A bearing means the fan assembly comes out. Service call.
Before you open anything
Safety
Isolate the cabinet at its switch or breaker before touching the condenser or any panel; a capacitor can hold a charge after the power is off. Commercial condenser fins are sharp and the fan can start without warning while the unit is live. Never cut or lever a refrigerant line for access. Do not move a stocked cabinet on castors alone — empty it or get help, because a loaded commercial cabinet is far heavier than it looks.
When to call a technician
Call once the condenser is genuinely clean, the cabinet is level and braked, and a squeal or rumble remains — that is a bearing or a mount and the fan assembly has to come out. Call urgently rather than waiting if the cabinet is also failing to hold temperature, because stock is at risk. Call immediately if you smell burning or see oil at the compressor.
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: fan and compressor part identifiers, clearance dimensions, refrigerant charge figures and duty ratings, all of which differ between the upright, under-counter and walk-in families.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
