The most common leak is a blocked defrost drain. Each defrost cycle melts frost off the evaporator, and that water runs through a trough and a tube to a pan near the compressor, where it evaporates. When bits of food, mold or ice block the drain opening, meltwater backs up. In top-freezer models it often freezes into a sheet on the freezer floor and then drips into the fresh-food section; in bottom-freezer and side-by-side models it tends to pool under the crisper drawers or seep out at the front. The fix is to clear the drain and correct why it froze, which can be a defrost part or a drain heater or heat-conducting clip that has failed or slipped out of place.
Second is the water supply line. Many refrigerators are still fed by quarter-inch plastic tubing, which hardens and cracks with age, or by copper that kinks when the refrigerator is pushed back. Compression fittings at the shutoff valve and at the back of the cabinet loosen with vibration or were never tightened fully. Leaks at the supply end usually show as water spreading from behind the refrigerator or dampness in the cabinet under the sink, and they are continuous rather than tied to defrost or ice cycles. Replacing brittle plastic with braided line and properly seated fittings ends most of these.
Third, the water inlet valve and the filter. The inlet valve at the lower back of the cabinet can crack its plastic body, especially if water inside it froze in a cold garage, or its outlet fittings can weep. The filter head or housing can crack, and a filter that is the wrong fit or not fully locked in can leak every time the dispenser runs. Filter leaks appear inside the fresh-food compartment or at the base grille, depending on where the filter sits. A valve leak shows up behind the refrigerator and gets worse each time the ice maker or dispenser calls for water.
Fourth, ice maker and dispenser leaks. An inlet valve that doesn’t fully close lets water trickle into the ice maker between cycles, building an ice sheet under the mold that melts out onto the floor when the door is open. A cracked fill cup, a split fill tube or a refrigerator tilted forward can let water miss the mold entirely. Dispenser leaks include a water line that splits inside the door, often where it passes through the hinge, and a nozzle that keeps dripping after every glass.
Finally, the leaks that aren’t really leaks. A drain pan that is cracked or knocked out of position lets defrost water run onto the floor; the water appears near the front base, a few times a day. Condensation can drip from a door gasket that no longer seals. And a refrigerator leveled with its front lower than its back can shed water from shelves and troughs that would otherwise hold it. Most refrigerators should sit slightly higher at the front so the doors swing closed on their own. All of these are simple to correct once identified.
