What you can check yourself
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- Check the door seal (gasket) around the freezer door for gaps, tears, or a weak magnetic pull — a bad seal is the single most common cause of frost buildup, since it lets humid air in continuously.
- Make sure the freezer isn't overpacked against the back wall, which can block the vents the defrost system and fan both rely on.
- If the fan noise is new and sounds like grinding, clicking or a blade hitting something, that's consistent with ice buildup physically touching the fan — a manual defrost (unplugged, doors open, several hours) often resolves it.
- Check that the freezer door is closing fully and latching — even a slightly ajar door is enough to cause ongoing frost buildup over time.
Still not working? A technician can take it from here.
Book a visitWhen to call a technician
Call a technician if frost returns within a few weeks of a manual defrost with a confirmed good door seal — that points to the defrost heater, defrost thermostat, or defrost timer/control board needing replacement.
How the automatic defrost cycle is supposed to work
Modern refrigerators run the compressor for a while, then periodically pause and run a small heater (the defrost heater) to melt any frost that's accumulated on the evaporator coil, with a thermostat or timer controlling when that happens. When any part of that sequence fails — the heater doesn't turn on, the thermostat doesn't sense correctly, or the timer doesn't trigger the cycle — frost just keeps accumulating instead of being cleared every cycle.
Door seals matter more than people expect
A worn gasket doesn't just waste energy — the humid air it lets in is the actual source of most of the frost the defrost system then has to deal with. Replacing a $20 to $40 gasket is often a more effective long-term fix than repeatedly defrosting a freezer with a seal that's past its life, since you're addressing the cause rather than the symptom.
A note on this brand's codes: If you own a Samsung or LG unit and see a specific error code rather than just the physical symptoms described here, check our Samsung refrigerator or LG refrigerator code guides for the exact code meaning.
