What Is Usually Behind It
Appliances make noise because parts move, and a new or louder noise means a moving part has changed. In a refrigerator the usual sources are the evaporator fan behind the freezer panel, the condenser fan below, and the compressor. A fan bearing that is drying out hums or rattles; a fan blade hitting frost buzzes or scrapes; a compressor working harder than it should knocks or clicks as a relay cycles it. In a dishwasher the circulation and drain pumps are the noisemakers, often because a shard of glass or a fruit pit has found its way into the impeller. In a range or cooktop, a persistent click is almost always the spark igniter.
The reason we take noise seriously is that it is an early warning. A fan that hums today can seize next month and take the cooling with it. A compressor that knocks is telling you the sealed system is under strain. Booking while it is still just a noise usually means a fan or a bearing rather than a compressor or a full sealed-system repair.
Notes by Brand
Sub-Zero: a rattle or buzz that changes when the door opens often points to an evaporator fan icing up or a worn condenser-fan bushing.
Wolf: a range or cooktop that clicks continuously is the spark igniter, not a bearing; a convection oven that hums is usually the convection fan.
Bosch and Miele: a grinding dishwasher usually has debris in the pump; both brands isolate pump faults cleanly during a test cycle.
Thermador and Viking: compressor and fan noise in refrigeration, and convection-fan noise in ovens, are the common calls.
Monogram, Dacor, and Liebherr: the same moving parts apply, and we locate the noise by running the unit and listening at each component.
Help Us Pinpoint It
Note when the noise happens: all the time, only when cooling, only when the door is closed, or during a wash cycle. A short phone video with sound can help our technician arrive with the likely fan, pump, or igniter after diagnosis.
Symptom and Cause Table
| Noise | Likely Cause | What We Check |
|---|---|---|
| Buzz or rattle in fridge | Evaporator or condenser fan | Fan blade, bushing, frost contact |
| Knock or hum, warming | Compressor under strain | Compressor, relay, sealed system |
| Grinding dishwasher | Debris in the pump | Pump impeller, filter, sump |
| Continuous click at burner | Spark igniter fouled | Igniter, spark module, cap |
| Hum from oven during bake | Convection fan motor | Fan bearing, motor, mount |
Hearing a New Noise?
Book a diagnosis with a brand-focused technician. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.