LG LSC27990TT Service Manual page 15

MICOM FUNCTION
2-7. Control of variable type freezing fan
1. To increase cooling speed and response to load, the MICOM will vary the speed of the freezer fan between low and high.
2. The MICOM runs the fan at high speed only at power-up and for ICE PLUS cycles, and runs at low speed for all other
settings.
3. If you open the freezer door, the refrigerator door, or the home bar door, and the freezer fan was running at high speed, it
will reduce to low speed. If it was running at low speed when a door was opened, it will turn off.
4. If the MICOM determines the BLDC fan motor is locked up, (no signal for 115 seconds) it will show a failure code on the
display and cut power to the fan. To power the fan again, unplug the refrigerator for a few seconds and plug it in again.
2-8. Control of cooling fan motor
1. The cooling fan motor performs ON/OFF control by linking with the COMPRESSOR.
2. It controls at the single RPM without varying RPM.
3. Failure sensing method is same as in fan motor of freezing fan motor (refer to failure diagnosis function table for failure
display).
2-9. Door opening alarm
1. The buzzer sounds when any door is held open for more than one minute.
2. After any door has been open for one minute, the buzzer sounds three times for
times for second each every thirty seconds until the door is closed.
3. When all open doors have been closed, the buzzer stops.
Doors of freezer,
refrigerator, or
Closing Opening
home bar.
BUZZER
2-10. Ringing of button selection buzzer
1. If pressing the front display button, Ding ~ sound rings.
Closing Opening
Less than One minute
one minute
- 15 -
second each, then it sounds three
3 Times 3 Times 3 Times 3 Times
30 30 30
seconds seconds seconds
Closing