Hello,
A mechanical defrost timer controls the defrost cycle
of the freezer. In older models, the timer runs continuously
and roughly every six hours, cuts power to the cooling system and
sends power to the defrost heater. In newer models the timer advances
only while the compressor or defrost cycle is running - an improvement
for efficiency. As the timer continues to advance, power to the
heating element is cut and power is restored to the cooling
system. If the timer does not advance, the appliance will be stuck
either in defrost or refrigerate mode, resulting in, respectively,
no cooling or frost build-up.
The defrost timer is usually found
behind the front grill "toe kick" of the refrigerator. It may also be
found behind a cover plate inside the refrigerator or freezer, in the
temperature control console, or behind the refrigerator near the
compressor.
To test whether the defrost timer is simply failing to
advance, locate the advance screw and turn it clockwise until you
hear it click. This advances it to the next mode. If it was cooling
before, it is now in defrost mode. Simply wait about 35 minutes
and check whether it has left defrost mode and has resumed cooling
(listen for the compressor). If it does not advance, the timer
motor is probably bad and the entire timer needs to be replaced. If
it advances as it should, then you can follow the steps below to test
the switch electrically.
The timer is usually held in place with one
or more screws. Remove the screws and gently pull the timer
out far enough to disconnect the wiring connector. The connector
can be removed by firmly pulling and rocking it left and right. It is
not necessary to note the position of the wires because the connector
plug is keyed so that it can be replaced in only one way.
Take care.
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