Refrigerator Guide
Ice Building Up in Your Refrigerator or Freezer
A thin layer of frost is normal. Thick ice on the back wall, around the vents, or on the freezer floor is not — it usually means the automatic defrost system isn't keeping up, or warm air is sneaking in.
Common causes
- A failed defrost heater, thermostat, or control board — frost builds on the evaporator and blocks airflow.
- A door left ajar or a worn gasket letting humid room air condense and freeze.
- A blocked or frozen defrost drain pushing water back up where it re-freezes.
- Frequent door openings in a humid kitchen (more common in summer).
Why it matters
Ice on the evaporator coils restricts the airflow that cools the fridge, so a defrost fault often shows up first as a fridge that won't cool properly. Catching it early avoids spoiled food and a bigger repair.
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Frequently Asked Questions
Will manually defrosting fix it?+
It clears the symptom temporarily, but if the defrost heater or thermostat has failed, the ice returns within days. The faulty part needs replacing.