Diagnose noise by location
A Commercial Cool refrigerator makes several noises by design: gurgling as refrigerant moves, ticking as controls switch, and a hum whenever the compressor runs. What is worth investigating is a new noise, a noise that changes when you open the door, and a noise accompanied by anything else — poor cooling, frost, or a warm cabinet. The BCD designation spans five model numbers in the table below. Which one you have decides the part number, not the repair — the fault below is the same across the line.
What you actually observe
- Humming that rises and falls through the day — A compressor loading and unloading against a warm room, not a fault by itself.
- A rattle that appeared after a big shop — Bottles and containers touching, or a shelf no longer seated. Empty it and run it to check.
- Buzzing through the floor rather than through the air — Structural transmission. A suspended floor amplifies a perfectly healthy compressor.
- Fan noise that continues with the door open — The door switch should stop the internal fan. If it does not, the switch has failed.
- NEAR MISS — a click a few seconds after the door closes — That is the fan restarting and a control switching. Normal on every cabinet of this type.
Ranked causes on these models
- The evaporator fan — Ranked first when the noise comes from inside the cabinet and changes as the door opens. The door switch stops that fan, so the door test identifies it without any tools.
- Installation and levelling — Second. Feet that were never wound out, a floor that slopes, or a cabinet pushed against a wall. Free to fix and instantly obvious once found.
- Loose parts in the compressor compartment — Third. Drip trays, cable clips and the occasional dropped object. Visible with a torch, with the unit unplugged and pulled out.
- Compressor, mounts and relay — Last. These are behind a panel on a live appliance, and the relay in particular should be diagnosed rather than swapped on a guess.
Check in this order, and why that order
- Ask what else changed — A noise that arrived with poor cooling, frost or a warm cabinet is a symptom of that fault and should be diagnosed as that fault.
- Empty the cabinet and run it briefly — Bottles touching, shelves half-seated and loose accessories imitate mechanical noise convincingly.
- Test the door switch — Press it by hand and listen. Fan noise that continues with the door open means the switch has failed and the fan is running when it should not.
- Then call, with the location — Where the sound is and when it happens decides what the technician brings. It is the most useful sentence you can give them.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. A fan that ticks against ice should not be freed with a screwdriver or a heat gun: unplug the cabinet, empty it and let the ice thaw naturally. Never run a refrigerator with a rear panel removed to listen to it, and never wedge a door switch to keep a fan running while you investigate.
Models this page covers
Reference| Model number | Family key |
|---|---|
| BCD-127-E | commercial-cool:refrigerator:bcd |
| BCD-213 | commercial-cool:refrigerator:bcd |
| BCD-518WEV-62H | commercial-cool:refrigerator:bcd |
| BCD-570WEVI-62H | commercial-cool:refrigerator:bcd |
| BCD-90-E | commercial-cool:refrigerator:bcd |
Where the owner line is on these models
On these models the owner line falls between the cabinet and the panels. Levelling, clearance, the drip tray, the load and the door test are yours and they resolve most noise complaints outright. Call when the noise is inside the cabinet and survives a defrost, when a relay clicks repeatedly without the compressor starting, when a hum has deepened while cooling has got worse, or when anything metallic has appeared recently. Those point at fan motors, mounts, the relay or the compressor, all of which live behind panels on a live appliance. A technician will ask which of the five BCD models you have before they set off, and the rating plate inside the cabinet is where that number lives.
Other BCD problems we cover
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
