Determining whether your refrigerator defrost drain hole is blocked requires checking for specific interior water accumulation and freezing patterns. If you open your refrigerator and discover standing water pooled at the very bottom of the fresh food compartment right underneath the vegetable crisper drawers, or if you find a thick block of solid ice freezing across the floor of your freezer compartment, your drain hole is definitely blocked. You can troubleshoot drainage easily by inspecting the back wall trough. You can verify that the drain hole is blocked when pouring a small spoonful of warm water into the drain trough causes the water to pool and overflow rather than draining smoothly down into the lower evaporation pan.
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