Why does my refrigerator get warm and then cold again?

Discovering that your residential refrigerator fluctuates erratically—getting warm for hours before suddenly cooling down again—is frequently caused by an intermittent thermal overload trip, an icing-over evaporator coil, or a failing defrost timer. When heavy dust insulates your condenser coils, the compressor overheats and shuts down on its internal thermal safety switch until it cools off, allowing the interior to warm up temporarily before restarting. Another cause is a sticky defrost cycle. You can troubleshoot by inspecting condenser coils and freezer frost. You can verify that the underlying issue is resolved when cleaning dust off the condenser coils, clearing airflow restrictions, or replacing a failing defrost thermostat stops the temperature fluctuations and keeps your storage environment consistently cold.