The short answer
Noises on the Costway BC refrigerator family are best diagnosed by location and timing rather than by description. A noise from the back that comes and goes with the compressor is one family of causes; a noise from inside the freezer that changes when you open the door is another; a rattle that stops when you press on the cabinet is neither.
What you see on the BC family
- A rhythmic ticking or scraping from inside the freezer — That is the evaporator fan blade touching frost, and the sound usually changes or stops when the door is opened.
- A click every few minutes from the lower back, then silence — The start relay trying and failing to start the compressor. This is the one noise on the list that needs attention quickly.
- A buzz or hum that has become noticeably louder — Often the condenser fan running against dust, or the whole cabinet resonating because it has shifted on its feet.
- A rattle that changes when you lean on the cabinet — Vibration transmitted into a cupboard, a wall or a drip tray. It is noise rather than fault.
Causes, most likely first on the BC family
- Cabinet resonance, levelling and the drip tray — Ranked first on the BC family — where the noise started after the unit was moved or cleaned behind, this is the change and nothing inside the machine has altered at all. A cabinet that has shifted on its feet rests against a cupboard or a wall and transmits ordinary compressor vibration into the joinery. A drip tray that has slipped its seat buzzes in sympathy.
- Condenser fan and a dust-loaded coil — Second — and it pairs with the cooling page: the same dust that makes this noise also makes the cabinet warm. The fan at the lower back runs whenever the compressor does, and dust on the blade or debris in its path makes it whine, buzz or tick.
- Evaporator fan blade catching frost — Third — the door test identifies it immediately and it points straight at a defrost problem underneath. Ice builds where it should not and the fan blade clips it once per revolution. The noise is rhythmic, it comes from inside the freezer, and it usually changes the moment the door is opened because the fan stops.
- Start relay or compressor — Fourth — a clicking relay with a warming cabinet should not be left running for days. A relay that cannot start the compressor clicks every few minutes as the overload cycles. A compressor with worn mounts or internal wear knocks or drones instead.
- Body: With only 2 codes in the BC family the ranking below is taken over a short roster rather than over everything the brand sells, which is why the top of this list is not where the brand-generic article puts it.
Check in this order, and why
- 1. Stand still and locate the noise before anything else — Front, inside the freezer, or lower back. Location alone removes most of the list and it costs nothing.
- 2. Open the freezer door while the noise is happening — The evaporator fan stops with the door open on most cabinets, so a noise that vanishes is that fan and a noise that continues is not.
- 3. Lean gently on the cabinet and on the adjacent joinery — If the noise changes or stops, it is resonance rather than a failing part, and levelling the feet is the repair.
- Body: The 2 codes in the BC family are close enough in layout that the order below holds across all of them; check the plate on your own unit against the table before you order anything.
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. Pull the cabinet out with the doors closed and the shelves loaded low, because a full door turns a heavy cabinet into an unstable one. Do not reach into the freezer to feel a running fan blade, and do not chip ice off the evaporator.
Models in the BC family
Reference| Model number | Family key |
|---|---|
| BC-46B | costway:refrigerator:bc |
| BC-90U-E | costway:refrigerator:bc |
When to call a technician
Call when the noise is a click-pause-click from the lower back, especially with a cabinet that is losing temperature, because that is a start relay or a compressor and both are service parts. Call too when a fan noise persists after the frost has thawed, since a fan that has been running against ice often has a worn bearing by then.
Other BC refrigerator pages
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