Defrost Cycle; Dispenser Lock; Liner Protection Mode - GE Profile PDCF1NBW Technical Service Manual

Defrost Cycle

The refrigerator utilizes an adaptive defrost cycle
that operates a glass enclosed heater to remove
frost from the evaporator. Defrost time has changed
from 60 hours adaptive defrost to 96 hours adaptive
defrost.
The control board determines the length of time the
heater is energized. It does this by monitoring the
freezer evaporator thermistor. Once the temperature
of the thermistor reaches 75°F, the control cycles
the defrost heater off. A bi-metal safety thermostat
provides a backup in the event the evaporator
thermistor fails. The safety thermostat prevents the
temperature from exceeding 140°F.
Note: Refer to Pub# 31-9062 for information about
basic adaptive defrost.

Liner Protection Mode

The refrigerator incorporates a liner protection
mode for the freezer section. The freezer evaporator
fan will start and run on high speed if the door
has been open for 3 minutes. Air will circulate into
the fresh food section if the damper is in the open
position.
This mode is controlled by 2 timers. Timer #1
monitors door-open time. A 3-minute door-open
count begins when the door is opened. If 3 minutes
elapse before the door is closed, the liner protection
mode will become active. Once the door is closed,
timer #1 resets and liner protection mode goes into
standby. In standby, normal fan operation resumes
and timer #2 begins a 3-minute door-closed count.
If 3 minutes elapse without a door opening, liner
protection mode will completely deactivate. If a door
is opened within the timer #2 door-closed count,
the remaining time in the door-closed count will be
deducted from the timer #1 door-open count.

Dispenser Lock

When the dispenser system is locked, actual and
set temperatures can be viewed but no dispenser
command will be accepted. This includes the
dispenser cradle and will prevent accidental
dispensing that may be caused by children or pets.
If a pad or the cradle is depressed with the system
locked, it will be acknowledged with three pulses of
the LOCK LED accompanied by an audible tone.
Lock LED
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