Three Probable Causes of a Leaky Refrigerator
If your filter is not installed properly, or the filter is old or doesn't fit correctly with your refrigerator model, chances are there is a poor connection between the filter and the water supply. To prevent your refrigerator from leaking, check to see if water is escaping due to holes in the filter. Also, check the size and model of both the fridge and filter to ensure it's the correct part for your refrigerator.
Examine the drain pan for any cracks, which is located at the bottom of the refrigerator. If you notice a significant amount of pooling underneath, chances are the pan has a crack and that's what is causing the leak. Replace the pan immediately if you notice any damage.
One of the most common causes of a leaky refrigerator is a faulty defrost drain. When the defrost drain is blocked by food particles or ice, it prevents the water accumulated during the defrost cycle to properly drain into the pan. Eventually, water will start to build up. Without anywhere to drain, water will begin to flow right onto your floor. Remove any blockage caused by food particles or ice by flushing the drain with hot water and removing debris carefully.
Source: Roto-Rooter Online