In many instances, the source of the water in your Amana TZ19QL refrigerator is the evaporator coil – or the melted frost from it. With normal use, the cooling coil in the freezer compartment will begin to frost over. If left to frost, the cooling of the unit would be compromised. Fortunately, this model has an automatic defrost system that turns on from time to time and uses a small heater to melt away the frost. The water produced by the melting drips into a drain and flows down a tube to a catch pan beneath the refrigerator. This dripping water becomes a leak if it fails to go down the defrost drain.
Two possibilities can make the water divert from the defrost drain normally and make it leak into the compartment below. If ice has formed over the drain or there is a bit of debris blocking the drain or tube, the water will overflow and drip down through the cooling dampers between the compartments where the chilled air flows. These openings lead directly to the fresh food area, and the water will continue downward until it settles at the bottom of the refrigerator.
Clearing the defrost drain and tube is the only way to stop the leak. If the problem is ice over the drain, pour hot water into the drain for a few moments until the ice melts and the drain opens up. If debris is blocking the drain, it will need to be removed. You may be able to do this manually, but if the clog is very far down in the tube, a turkey baster filled with hot water and a bit of baking soda should work to blast out the material.
In some cases the defrost system has nothing to do with this type of leak. The leak may be the result of a problem with the water supply line to the ice maker. Check the connections from the main water supply to the inlet valve and the device itself. If there is a drip from these connections or a ruptured line, repair the line or tighten the connections to stop the leak.