LG GR-J303TG, Service Manual

Page: 12 / 46

3-1-13. FAILURE DIAGNOSIS FUNCTION
(1) Failure Mode
1. Failure diagnosis function is intended in order that service is easily done when failure to affect performance of the product
during use occurs.
2. Function is neither done, nor buzzer sound rings even when pressing the button in occurrence of failure.
3. The product returns to normal operation if failure is released during display of failure code in occurrence of failure
(RESET).
4. LEDs other than failure code turn off in occurrence of failure.
Note 1) All LEDs except for failure display LED (F1, F2, F3, F4, F5) turn on if simultaneously pressing both upper “Store”
button and middle “Store” button for a second where poor ambient temperature sensor exists.
- 12 -
1
2
3
4
5
6
7
8
9
10
Failure Display
(Food LED)
F1 F2 F3 F4 F5
NO Item
Failures
Remarks
Failure of upper
compartment (K1)
sensor
Failure of middle
compartment (K2)
sensor
Failure of lower
compartment (K3)
sensor
Failure of upper
compartment
defrosting sensor
Failure of middle
compartment
defrosting sensor
sensor Failure of
ambient
temperature sensor
Failure of single
motor damper
Poor defrosting at
upper compartment
Poor defrosting at
middle compartment
Poor
communication
Upper compartment sensor is disconnected
or shorted
Middle compartment sensor is
disconnected or shorted
Lower compartment sensor is disconnected
or shorted
Upper compartment defrosting sensor is
disconnected or shorted
Middle compartment defrosting sensor is
disconnected or shorted
Ambient temperature sensor is
disconnected or shorted
When ON/OFF of the reed-S/W is not
dectected even when driving the single
motor damper for 2 minutes
When defrosting sensor at the upper compartment
does not reach to more than 7°C even when two
hours have passed after starting defrost
When defrost sensor at the middle compartment
does not reach to more than 16°C even when
two hours have passed after starting defrost
When no communication is consecutively
done for 30 seconds
* Check wiring of respective
relevant sensor.
Damper motor damaged,
frozen, coil damaged, driving
IC(photo coupler) failure
Short of temperature fuse,
short of heater, clogging of
drain, poor heater driving relay
Short of temperature fuse,
short of heater, clogging of
drain, poor heater driving relay
Taking out of connector, Poor
TR on communication part
FS
US
LS
d1
d2
Note 1)
dP
H1
H2
CO
BEST MODEL
(GR-J303TG)
BETTER MODEL
(GR-J303TS)