This is the number one culprit. Over time, dust, food particles, and a sticky bacterial secretion called biofilm slide down the drain. It acts like liquid glue, slowly narrowing the passage until it creates a solid plug of black, slimy gunk.
We’ve all been there. You wake up, walk into the kitchen for your morning coffee, and squish . Your sock is soaking wet. There is a small, mysterious puddle of water spreading across the floor in front of your refrigerator. fridge drain blocked
If the defrost heater fails or the defrost timer gets stuck, ice builds up around the drain. If the drain line passes too close to a cold surface, the water inside the tube freezes before it can reach the evaporation pan. Ice expands, creating a solid plug. This is the number one culprit