Does every fridge have a drain hole?

Yes, virtually every modern residential auto-defrost refrigerator and freezer features an internal defrost drain hole designed to channel away melted condensation water during automatic defrost cycles. During these cycles, a heating element melts frost off the evaporator coils, and the resulting water drips into a collection trough and flows down through the drain hole into a drip pan located above the warm compressor, where it evaporates safely into the room. However, older manual-defrost freezers frequently lack a drain hole because they do not feature automatic defrost mechanisms. You can troubleshoot drainage by checking for pooling water. You can verify that your fridge has a functional drain system when checking the lower back freezer interior reveals an open drain trough that routes water smoothly out of the food compartment.