LG LFX28978 series Service Manual page 40

No Checking flow
5 Damper checking method.
Inputting TEST Mode,
Check the damper and PCB.
(3)
(2)
6 Check the Fan motor.
Rotate fan using your hand.
Stuck change the motor.
(Cause of ice or rust inside of motor)
7 Check the R Fan motor voltage.
(1) (2)(3)
(1)
(4)
<CON4>
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Result & SVC Action
Test Damper
Mode State
1 Mode Open
Damper is normal.
2 Mode Closed
1,2 Not
Change the damper
mode working
Point Result
270 ~330
(1) to (2)
Other
270 ~330
(3) to (4)
Other
Point Result
Sticky
Motor
Not Sticky
Point Result
(1) ~ (2) Below 12 V
(2) ~ (3) 0 or 5 V
SVC Action
(Go to 6)
SVC Action
It's normal
Change damper
It's normal
Change damper
SVC Action
Change the motor
Go to 7
SVC Action
Change the PCB
Change the motor