LG LFX25973 Series Service Manual page 38

No Checking flow
5 Damper checking method.
Inputting TEST Mode,
Check the damper and PCB.
(3)
(2)
6 Check the F-Fan Motor.
Rotate fan using your hand.
It feel sticky, change the motor.
(cause of ice or rust inside of motor)
7 Check the F Fan motor voltage.
(1)
(4)
(1)Pin8, (2)Pin10, (3)Pin12
<CON7>
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Result & SVC Action
Test
Damper state
Mode
Closed
1 Mode
2 Mode
Open
1, 2 mode
Not working
Test
Result
Point
270 ~ 330 Ω
(1) To (2)
Other
270 ~ 330 Ω
(3) To (4)
Other
Point Result
Motor Sticky
Point Result
(2) ~ (3) Below 7 V
(1) ~ (3) 0 or 5 V
SVC Action
Damper is
normal.
(Go to the 7)
Change the
damper
SVC Action
It's normal
Change damper
It's normal
Change damper
SVC Action
Change the motor
SVC Action
Change the Main PCB
Change the F Fan