The short answer
On a Brigade counter the first suspects are the condenser fan behind the front grille and the evaporator fan inside, both of which get loud when dirty or iced. Loose panels, worn castors and an unlevel unit come next. A compressor knock with a warming cabinet is the one that needs acting on immediately.
What you observe
- A whirr or warble at the front grille — The condenser fan, greased or out of balance.
- A scrape inside that stops when a door opens — The evaporator fan touching ice; the fan stops on the door switch.
- A rattle from a panel or the grille — Fixings shaken loose in a working line.
- A knock through the floor when the compressor runs — A worn castor or a unit not carrying load evenly.
- NEAR MISS - a hum that runs most of service — Long running in a hot kitchen is a capacity question.
Causes, most likely first on this brand
- A greased or obstructed condenser fan — First on front-breathing catering equipment. The grille is at floor level in a kitchen, so grease and dust reach the blade quickly, and an unbalanced fan is noisy long before it stops turning.
- Ice touching the evaporator fan — Second. Doors opened continuously during prep put humid air into the cabinet, and frost that grows into the fan scrapes intermittently and stops when a door is opened.
- Loose panels, grilles and fixings — Third. Counters are leaned on and knocked all day, and a panel that has lost a screw buzzes in sympathy with the compressor.
- Worn castors or an unlevel unit — Fourth. These are rolled out for cleaning and pushed back, and a flat-spotted castor or a leg not in contact lets the whole counter rock.
- A worn fan motor or a failing compressor — Last. A fan still noisy after cleaning is a part; a loud clunk at start with a warming cabinet is the compressor and is urgent.
Check in this order, and why
- Open a door while the noise is happening — The evaporator fan stops on the door switch, which identifies it.
- Remove the front grille and inspect the fan — Grease on the blade is obvious and free to fix.
- Push on each panel while the compressor runs — A buzz that changes is a fixing, not a mechanism.
- Rock the unit and check the castors — A flat-spotted castor or a high leg explains a knock.
What an owner can safely check
- Remove and degrease the front grille — Wash it rather than wiping it, then clean the fan blade gently.
Tools: degreaser, clothAbout 30 min
- Clean the condenser fins — Vacuum along the fins without bending them; this is the unit's only air path.
Tools: vacuum, soft brushAbout 30 min
- Defrost the cabinet if ice is touching the fan — Empty it, switch it off and let the ice melt rather than chipping it away.
Tools: towelsAbout 180 min
- Tighten fixings and check the castors — Panels, grille and handle fixings all loosen on a working line.
Tools: screwdriver, spirit levelAbout 25 min
- STOP HERE if a clean fan is still noisy — That is a fan motor.
Before you open anything
Safety
Switch the unit off at its breaker before removing the grille or reaching into the condenser area, because the fan can start at any time while it has power. Condenser fins are sharp - wear gloves, and use degreaser rather than a scraper. Get help to move a loaded counter. Never block the front grille to muffle a noise: a unit in a hot line that cannot breathe overheats and puts the stock inside it at risk.
When to call a technician
Call when the condenser and grille are clean, the cabinet has been defrosted, fixings are tight and a whirr or scrape persists. Call immediately if the compressor clunks at start and the cabinet is warming, or if it starts and stops every few seconds, because on a counter holding prepared food the value at risk is the stock rather than the repair.
Nearest pages of this class
What this page does not cover
This page covers the Brigade undercounter refrigerated counters built into a kitchen line and breathing through a front grille. Tall reach-in cabinets and walk-in rooms have different airflow and fail differently. Not covered by design: fan and compressor part identifiers, sound ratings, cabinet capacities and refrigerant data.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
