The first step is to find the source of the leak:
1. Inspect the door seals
Open the fridge door and check if there's any moisture on the rubber around the door. If there is, it could mean the door isn't shutting tightly enough and cold air is escaping from inside the refrigerator. Using a damp soft cloth, wipe the seals down to remove any crumbs or dirt that is caught in it. If the door seals are considerably worn, you might want to consider buying a new one. To find new parts, go to the Partsmaster website and type in the make/model of your fridge.
2. Check the door
Open the fridge door halfway - does the fridge door close on its own? If the seals are ok and it doesn't close on it's own it could mean the fridge is leaning too far forward. To fix this you'll need to adjust the refrigerator legs. Remove the guard at the bottom of the fridge and then have someone tilt the fridge back. Underneath there will be threaded or screwed legs that you can adjust accordingly.
3. Test the drip pan
The drip pan is at the bottom of the fridge and is there to catch any drips. With the front guard off and the fridge tilted, look for the drip pan; it will be made of plastic and metal and usually sits above the coils. Carefully remove the drip pan (as there may be water in it) and wash it with warm water. Next, pour water into the drip pan and check if it's leaking. If there's a hole you can buy a new drip pan from the Partsmaster website.
4. Inside the fridge
In the fridge there will be a defrost outlet, usually a round hole located near the compartments at the bottom. Look to see if anything has blocked the hole; some refrigerators come with a un-blocker utensil but if not you can also use something like a straw. Once done, pour a small amount of warm water into the hole and check the drip pan.
Another cause of a leaky fridge is having a build-up of ice at the back or bottom of the fridge. Make sure you defrost the fridge on a regular basis.
5. Check the hose fittings
Note: Before starting make sure you know how to turn off the water valve.
At the back of the fridge there should be several hose fittings. Look for any water leaks and tighten the fittings if they're loose. On some models, it could be that the hose has bee moved and is dripping onto the floor instead of the tray. Also, check there isn't any damage or cuts on the hoses.
Always refer to the manufacturer's manual for specific details.