LG GA-B409U*QA Service Manual page 21

5 ) DEFROSTING
(1) If the accumulated time for the operation of the COMPRESSOR is meet with 7 hours, the DEFROSTING HEATER is started.
(2) The rst defrosting is performed at 4 hours(compressor ON) later since the power is on.
(3) If DEFROST SENSOR is over 7°C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING HEATER paused,
And after 7 minutes, the operation for the freezing is started. But, if DEFROST SENSOR is not reach to 7°C after 2 hours' operation of
the defrosting heater, it represents a defrosting trouble.(See the TROUBLE REPRESENTING FUNCTION)
(4) If DEFROST SENSOR is short or open, defrosting is not performed.
6 ) ORDERLY OPERATION OF ELECTRIC PARTS
To avoid NOISE and DAMAGE, the items containing an electric parts such as COMP, DEFROSTING HEATER and FAN MOTOR operate
in order as follows.
OPERATION STATE
WHEN DEFROST SENSOR
TEMPERATURE IS OVER
7°C. (WHEN PURCHASING
OR MOVING)
WHEN DEFROST SENSOR
TEMPERATURE IS BELOW
7°C. (WHEN POWER
FAILURE OR SERVICING)
WHEN RETURNING TO NORMAL
STATE FROM TEST MODE
7 ) SELF-TEST
(1) Function to make service easy in case of occuring a trouble in the product.
(2) When occurring a trouble, if the button is pushed, but the function could not operate.
(3) If a trouble release during the representation of trouble, a refrigerator performs the normal function(RESET).
(4) To represent a ERROR CODE, it use FREEZE TEMP LEDs
CODE LEDs are all o .
POWER
ON
POWER
ON
after 0.5 sec.
All Elec. Parts
OFF
LED (88)
OPERATION ORDER
COMP
after 0.5 sec.
ON
DEFROSTING
after 0.5 sec.
HEATER ON
COMP
ON
COMP
after 7 min .
in the door . If ERROR occurs, the other LEDs except ERROR
-21-
after 0.5 sec.
after 10 sec.
after 0.5 sec.
after 0.5 sec.
ON
LED (BAR)
FAN
ON
DEFROSTING
HEATER OFF
FAN
ON
FAN
ON