LG LRFD21855ST Service Manual page 26

8-1-16 TEST Mode
1. The Test mode allows checking the PCB and the function of the product as well as finding out the defective part in case of
an error.
2. The test mode is operated by pressing two buttons at Display panel.
3. While in the test mode, the function control button is not recognized, but the recognition tone (beep~) sounds.
4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance.
5. If an error, such as a sensor failure, is detected while in the test mode, the test mode is cleared and the error code is
displayed.
6. While an error code is displayed, the test mode will not be activated.
MODE MANIPULATION
TEST1 Push Express Freezing
Key and LOCK KEY at the
same time for 3 seconds
OR Push TEST S/W(on
the main Board) once.
TEST2 Push Express Freezing
Key and LOCK KEY at the
same time for 3 seconds
in TEST MODE 1 OR
Push TEST S/W once in
TEST MODE 1
TEST3 Push Express Freezing
Key and LOCK KEY at the
same time for 3 seconds
in TEST MODE 2 OR
Push TEST S/W once in
TEST MODE 2
Reset Push Express Freezing
Key and LOCK KEY at the
same time for 3 seconds
in TEST MODE 3 OR
Push TEST S/W once in
TEST MODE 3
* Freezer Fan RPM Variable Check:
In case the freezer fan is in operation when the express freezer button and freezing temp. button. Control are pressed for
more than one second at the same time freezer fan RPM changes. (for example if high speed, to normal speed or if
normal speed, to high speed for 30 seconds)
After 30 seconds, it turns to its original RPM.
* Demonstration MODE:
1. When the express freeze button and the refrigerator temperature control button are pushed at the same time and hold
for 5 seconds or longer, it converts to demonstration mode.
2. The Display shows the Demo graphic.
3. In this status, all Loads are off (Compressor / Fan / Damper / Heater)
(Even is Demonstration Mode, the refrigerator Lamp automatic off function warks normally and can be demonstrated)
4. Exit the Demo mode and reset the Display by pressing the Freezer Temp. Control button and the Refrigerator Temp.
Control button for 3 seconds or longer.
CONTENTS
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER OPEN
3) Defrosting HEATER OFF
4) DISPLAY LED all ON
1) Continuous operation of the
COMPRESSOR and the Freezer fan
2) Stepping DAMPER CLOSE
3) Defrosting HEATER OFF
4) DISPLAY LED shows no. 2
1) COMPRESSOR and the Freezer fan
OFF
2) Stepping DAMPER CLOSE
3) Defrosting HEATER ON
4) DISPLAY LED shows no. 3
Reset to the previously setting
Before TEST MODE.
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REMARKS
Reset if the
Temperature of the
Defrosting Sensor is
46°F(8°C) or more.
The compressor will
Start after a 7-minute
Delay.