LG LFX28968D Service Manual page 35

Defrost Heater Error (F dH)
1
Check the Door gasket .
Is door gasket damaged?
No
2
Check the Defrost control part.
(1) Is Fuse-M resistance 34~42Ω?
Yes
3
Check the Defrost control part.
Is Defrost Sensor resistance
22kΩ↑ or OFF?
22kΩ↑
Replace the
Yes
Door gasket
Change
Defrost
No
Heater
Replace
OFF
product
4
Input Test 3 Mode
(Push the button 3 times)
Check the Heater Voltage.
Is voltage 112~116V?
TEST MODE 3
CON3
nd th
2 pin ~ 9 pin
Yes
5
Input Test 1 Mode
(Push the button 1 times)
Check the Heater Voltage.
Is voltage 0V?
TEST MODE 1
CON3
nd th
2 pin ~ 9 pin
Yes
6
Explain to customer
Replace
NO
Main PCB
Voltage [V]
112V ~ 116V
Replace
No
Main PCB
Voltage [V]
0V