LG GB7143**AV Series Service Manual page 50

5. Defrost Heater Error (dH F)
No
1 Check the Door gasket.
2 Check the Defrost control part.
3 Input Test 2 Mode.
(Push the button 2 times)
4 Check the Brown to Blue.
<CON3>
5 Release the test mode.
Push the button 1 times. (Normal)
6 Check the Brown to Blue.
<CON3>
Checking flow
Def Heater
Fuse M
Def Sensor
Result & SVC Action
Part
Fuse-M
34~42
Def
Heater
Def
Sensor
Result
220 ~ 240 V
0 V
Result
0 V
220 ~ 240 V
- 50 -
Result SVC Action
Go to the 3
0
Change Fuse-M
Go to the 3
Change Fuse-M
Go to the 3
0
Replace product
SVC Action
Go to the 5
Replace Main PCB
SVC Action
Explain to customer
Replace Main PCB