RB215LABP Samsung Heater drip tray not draining. Drain seems to be free of debris. In my opinion the tray is not heating up during defrost.

The water condensation in fridge or freezer is usually the result of bad door seals, or a clogged drain line. Unless ur having a defrost issue and its freezing over really bad and hindering air circulation. then check the defrost terminator and heating element.
Freezer /fridge water/ice in fridge and or freezer, or leaks on floor

Usually due to CONDENSATION due to bad door seals or a plugged evaporator drain line? Can use a soft flexable tubing and very hot water to clean it out. Bad door seals usually need replacement, but u can use a blow dryer and something to pry it closer to the door wall while blowing hot air on to it. To create a seal, to test for bad door seals place a dollar bill in between the door and wall of fridge where it closes. Then slide out the dollar bill with door closed. It should offer some resistance and not be easy to pull out.

Fix any gaps in the door seal.Pack out the seal underneath the areas where the door seal has the gaps. This can be done with a small strip of weather stripping, as shown here, or a bit of tightly rolled up paper under the door seal. Alternatively, you can heat the door seal up with a hair dryer to fix the gaps. This softens the door seal and allows you to stretch it.

Most all fridges have a drain. Look inside your fridge for a "V" shaped channel with a small hole. This hole leads to a tube and a small pan which sits on top of your refrigerator's compressor. The defrost cycle causes water to run into the channel, down the tube, and then it generally evaporates with the heat of the hot condenser/compressor.
However, if that tube is clogged with food crumbs, particles , debris etc, you will have to clear it to get back to a normal mode of operation. A toothpick, pipecleaner, straw or a cotton bud can often do the trick. Another trick one can use is to connect a copper tube wire with one end going into the drain hole then attach the other end to the heater wrap it around heater a few times. That will take care of the drain problem when it comes to ice build up but not food build up.
Even a frost free freezer will still ice up at times in the areas away from the heated defrost area and the drain line can freeze. This icing causes the pipe work to the compressor to ice over or sweat and cause a puddle. Or if the drainage has frozen over, it will need to be de-iced. ( usually the line is under the freezer bottom plate covering. Towards the back of the unit) And there is another inside the fridge area also.
Give the freezer a good overnight defrost until it's totally clear of ice in addition to making sure the drain is clear to the pan at the back and then restart the freezer.
God is so good: so this is why I give free advice so please thank him not me.