I do not like the easy way out of sending links, but this should clarify.
If a fridge without an ice making compartment has a build up of ice on the
back plate, the appliance has a problem.
This term relates to the fridge only. Condensation that forms on the back
wall of your fridge can turn to ice and affect both the preservation of your
foods and the running of the appliance. The auto defrost function works by
heating the cooling element for a short period of time, melting any frost
that has formed. This is then drained through a collecting duct located at
the back of the unit. This is an extremely common function and should be
found on all fridges.
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