Start with the door and gasket
A door that does not close completely can allow humid room air into the compartment. Check for packages, shelves or drawers interfering with closure and inspect the gasket for obvious damage.
Document the frost pattern
Before removing heavy frost, take a photo showing where it formed. Frost concentrated around a door opening suggests a different problem than ice concentrated on an evaporator cover or drain area.
Avoid damaging the appliance
Do not chip ice with sharp tools or apply uncontrolled heat to plastic liners or refrigeration components. If defrosting is required, follow model-appropriate procedures.
Frequently asked questions
Why does frost keep coming back?
Recurring frost can involve air leakage, door sealing, drainage, airflow or defrost-system problems.
Can a bad door gasket cause ice buildup?
Yes. Air leakage can introduce moisture that freezes, although the complete pattern should be evaluated before replacing a gasket.