Match the Sound to the Source
Appliances make mechanical sounds by design, so the goal is telling normal from abnormal. A steady hum from a running compressor is expected; a loud, resonant buzz is not. Occasional relay clicks are routine; rapid clicking with a warm cabinet is not. A new grinding or squealing almost always means a bearing in a fan or pump is failing. Where the sound is loudest, and what the appliance is doing when it happens, narrows the cause quickly.
Noises by Type
| Sound | Likely Source | What It Needs |
|---|---|---|
| Loud buzz or hum | Fan bearing or hard-working compressor | Fan replacement or condenser cleaning |
| Rapid clicking, warm cabinet | Compressor start relay | Test and replace relay/overload |
| Grinding or squealing | Evaporator fan or pump bearing | Replace failing motor or pump |
| Rattle or vibration | Loose panel or unlevel unit | Level and secure, isolate contact |
| Continuous cooktop clicking | Ignition module fault | Clean caps, replace spark module |
Notes by Brand
Sounds read a little differently across the roster. Sub-Zero built-ins that develop a loud hum usually have a condenser or evaporator fan bearing going, and a dirty condenser makes the compressor louder as it works harder. Wolf and Thermador cooktops that click continuously point to ignition modules rather than a mechanical fault. Miele and Bosch dishwashers that grind during drain are usually a failing drain pump or debris in the impeller. Viking and Liebherr refrigeration most often makes noise from fans. We listen with the unit running, isolate the source, and replace only the part responsible.
Hearing Something New?
Book a diagnosis. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.