Why does the fridge make strange noises (humming, clicking, or vibrating)?
A guide to the most common causes of odd fridge noises: poor leveling, compressor hum on startup, defrost timer clicking, and the fan blade scraping against built-up frost.
Recommended steps:
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1. Vibration from uneven leveling against the wall or cabinets
If the front feet aren't properly leveled, the whole cabinet rocks slightly with every compressor cycle, and that motion transfers into the wall or nearby cabinetry, amplifying the sound like a resonance box.
💡 Place a bubble level on top and adjust the front feet until it tilts slightly backward (1-2 mm), keeping it at least 5 cm from the wall.
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2. Normal compressor hum on startup and shutdown
It's normal to hear a low hum for a second or two right as the compressor starts, followed by a metallic click when it shuts off — that's refrigerant pressure equalizing in the circuit. It becomes a problem when that hum turns constant, high-pitched, or much louder than before, which usually points to worn compressor bearings.
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3. Clicking from the automatic defrost timer or relay
Every 6-12 hours the fridge triggers an automatic defrost cycle through an electromechanical timer or relay; the click you hear at the start or end of this phase is completely normal and lasts only an instant.
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4. Evaporator fan blade scraping against built-up frost
A sharp, intermittent buzz that gets louder when you open the door is usually the fan blade catching on a layer of frost built up on the evaporator, often caused by a door seal that isn't closing properly and letting moisture in.
💡 Unplug the fridge for 24 hours to fully defrost the rear evaporator, then test the door gasket with a sheet of paper: if it slides out with no resistance, the seal needs replacing.
Frequently Asked Questions
Is it normal for the fridge to click when starting and stopping?
Yes, that's the compressor's starting relay and it's completely normal. It's only a concern if it's paired with prolonged humming, strong vibration, or the fridge losing its cooling.
What should I do if the hum is new and much louder than before?
First check the leveling and the cleanliness of the rear condenser; if the noise persists and stays constant throughout the whole cycle, the compressor bearings are likely worn and it's worth having a technician check it.