LG LRDN22734SB Service Manual page 26

8-1-8 Buzzer Sound
When the button on the front Display is pushed, a Ding~ Dong~ sound is produced.
(Refer to the Buzzer Circuit 8-2-4 No. 3)
8-1-9 Defrosting (removing frost)
1. Defrosting starts each time the COMPRESSOR running time reaches 7 hours.
2. For initial power on or for restoring power, defrosting starts when the compressor running time reaches 4 hours.
3. Defrosting stops if the sensor temperature reaches 46.4°F(8°C) or more. If the sensor doesn't reach 46.4°F(8°C) in
2 hours, the defrost mode is malfunctioning. (Refer to the defect diagnosis function, 8-1-13.)
4. Defrosting won't function if its sensor is defective (wires are cut or short circuited)
8-1-10 Filter Replacement Indication
1. In 6 months after the UNIT (refrigerator) is power on, or after 28,000 seconds of dispenser use, the water filter Indicator
LED (red color) will be ON.
2. When the water filter indicator LED is illuminated, you should change the water filter. After this, you must press the water
filter button for three seconds and you will hear a ding-dong sound.
The LED will be OFF. This operation will indicate that the UNIT is reset to its initial conditions, so this process is restarted.
8-1-11 Power Failure Compensation Function
1. When the UNIT is power off, the Fresh Food and Freezer Temperature notches, the filter elapsed time for replacement,
the temperature mode (°C or °F) and the dispenser lock mode are saved in the EEPROM.
2. When the UNIT is power on, the MICOM will read the specified EEPROM addresses to restore the values indicated in the
previous paragraph.
8-1-12 Electrical Parts Are Turned On Sequentially
Electrical parts such as COMP, defrosting heater, freezer FAN, etc. are turned on in the following order to prevent noise and
parts damage. Several parts are started at the same time at initial power on and are turned off together when TEST is
completed.
OPERATING
Temperature of Defrosting
Sensor is 113°F(45°C) or
more (when unit is newly
purchased or when moved)
Temperature of defrosting
sensor is lower than
113°F(45°C)
(when power cuts, SERVICE)
Reset to normal operation
from TEST MODE
POWER COMP
in 1/2 second
ON
POWER
in 1/2 second
ON
COMP
in 1/2 second
ON
Total load
in 7 minute
OFF
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ORDERS
Freezer FAN
in 1/2 second
ON
Defrosting
in 10 second
heater ON
Freezer FAN
in 1/2 second
ON
COMP
in 1/2 second
ON
ON
Defrosting
heater OFF
Freezer FAN
ON