Drain heaters prevent the water in the drain pan from re freezing and clogging the defrost drain.
Whirlpool refrigerator drain tube freezing.
The permanent cure for repeatedly freezing condensate drains in whirlpool roper kitchenaid top mount refrigerators 6 replies the condensate drains in certain models of this refrigerator repeatedly freeze over causing water to run inside the refrigerator during defrost.
I had water dripping from the freezer into the refrigerator compartment.
Tube fitting parts ice maker parts insulation parts knob dial.
My frost free whirlpool freezer keeps freezing up where the excess water is supposed to go down the tube and collect in the tray below.
I consistently every month have to take everything out of the freezer to thaw out that area and tube only to have it freeze up again.
If your drain heater is defective or is not in the proper position the defrost drain might freeze over.