The Short Answer
Match the sound to a moving part. A whine or grind is almost always a fan or motor bearing. A rattle is something loose, or a fan blade brushing frost. A hum that is louder than usual is a compressor under strain. A repeated click on a range is the ignition module. A knock or thump in a dishwasher is the spray arm hitting a dish or a worn pump. The rhythm and location tell you as much as the pitch.
Start with the Quick Checks
Confirm the unit is level, since an out-of-level range or refrigerator vibrates against cabinetry. Check that nothing has fallen against an interior fan, and that dishes are not blocking a dishwasher spray arm. Listen for whether the noise tracks a cycle: rising when the compressor starts, stopping when a defrost begins. If the sound is constant and mechanical, a bearing or motor is the likely source.
Notes by Brand
- Sub-Zero and column refrigeration: a buzz or rattle that rises with cooling usually points at the evaporator fan striking frost or a condenser fan bearing. It often shows up before any warming does.
- Wolf ranges and cooktops: a persistent click after lighting is the ignition module or a wet electrode. Our guide on the clicking igniter walks through it.
- Miele, Bosch and Cove dishwashers: a grinding or humming pump often means debris in the sump or a failing circulation motor, not the wash arm itself.
- Viking and Thermador ventilation: a rattling blower is usually a loose wheel or a bearing, easy to mistake for a motor on its way out.
Symptom to Cause
| What You Hear | Likely Cause | What We Check |
|---|---|---|
| Whine or grind from a fridge | Evaporator or condenser fan bearing | Fan motors, blades, and frost contact |
| Loud hum, poor cooling | Compressor under strain or dirty condenser | Compressor draw and condenser condition |
| Rattle that comes and goes | Loose part or fan blade brushing frost | Mounts, blades, and defrost function |
| Clicking on a gas range | Ignition module or wet electrode | Spark module, electrode, and burner cap |
| Knock or grind in a dishwasher | Debris in sump or a failing pump | Sump, chopper, and circulation motor |
When a Noise Means Stop
A repeated hard clunk from a compressor, a burning smell alongside a hum, or continuous sparking near a gas burner are reasons to switch the appliance off and book rather than keep running it. Those sounds tend to precede a larger failure.
What We Do on Site
We isolate the noise to a component while the appliance runs, since a sound that only appears mid-cycle cannot be found with the unit idle. Once we identify the fan, motor, module or pump responsible, we replace the worn part with a OEM equivalent and confirm quiet operation. You get a written estimate before any parts go in.
Hearing Something New?
Book a diagnostic visit. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.
Frequently Asked Questions
Which Appliance Noises Are Normal?
A low hum from the compressor, occasional gurgling of refrigerant, a soft click as a defrost cycle starts, and water movement in a dishwasher are all normal. Noise becomes a symptom when it is new, loud, or tied to a change in performance like poor cooling.
My Refrigerator Is Buzzing Loudly. Is That Serious?
A loud buzz or rattle often traces to an evaporator or condenser fan hitting frost or a worn bearing, or to a compressor working harder than it should. It is worth diagnosing early, since a failing fan can lead to warming, and a straining compressor is costly to ignore.
Why Does My Gas Burner Keep Clicking After It Lights?
Continuous clicking after the flame catches usually means a spark module or igniter is stuck, or moisture and food debris are bridging the electrode. It is a common, fixable fault, but it should be addressed because the module keeps sparking near live gas.
Related
Not Cooling
When a noisy fan is also the reason the box is warming.
Failing Compressor?
The sounds that separate a worn fan from a dying compressor.
Refrigerator Repair
Fan, motor and compressor diagnosis on built-ins.