dont know what kind of refrigerator you have but this might help:
Frost free fridges in correct working order do not need to be defrosted, not even once a year. This problem is also completely fixable with at most a couple hours labour.
Water in the bottom of the fridge is caused by three things:
- plugged drain tube.
- plugged or frozen defrost pan.
- some other defect in the drain system.
Your drain pan is located in your freezing compartment of your fridge. It collects the condensate that is melted off the refrigeration coil by the defrost heaters. It directs the water to the drain tube system which takes it to the outside of the fridge where it is evaporated, often with an assist from the waste heat from the condenser.
If your fridge is equipped with a pan heating element and the element fails ice will form on the pan and eventually block the drain. This would account for the cyclic problem cured with a manual defrost that kat and nimsey lou report. The same symptoms can present themselves with a partially blocked drain (corn kernels are a common drain blocker). A secondary symptom of this condition is clear solid ice in the bottom of the freezer compartment. If a manual defrost doesn't clear a blocked pan the blockage is full and not ice and disassembly will be required to clear the blockage.
At the top centre back of your fresh compartment you'll usually have a small cup of rubber or plastic. If that cup has water or ice in it the problem is actually a blockage of your drain tube. Because it is a narrow spot the blockage is often at the exit of the cup or on the outside of your fridge where the tube takes a 90 degree bend down to the evaporator pan. If you can remove the cup do so and clean it out otherwise you might need to remove the tube/90 from the back; it's about 75/25. Sometimes a flexible piece of plastic, like a zip-tie, can be used like an drain auger to clear the blockage. Why does my fridge create pond inside