LG LFXC24726S Service Manual page 40

Defrost Heater Error (r dH)
1
Check the Door gasket .
Is door gasket damaged?
No
2
Check the Defrost control part.
Is heater resistance 105~117 ?
TEST MODE 3 RESISTANCE [ ]
CON3
6 th pin ~ 9 th pin
Yes
3
Check the Def rost control part.
Is Def rost Sensor resistance
22kΩ↑ or OFF?
CON7
Resistance [Ω]
13 th pin ~ 14 th pin
23ºF / -5ºC
32ºF / 0ºC
41ºF / 5ºC
50ºF / 10ºC
59ºF / 15ºC
22kΩ↑
Replace the
Yes
Door gasket
Change
Fuse-M
No
105~117
Change
OFF
Defrost
Sensor
38k
30k
24k
19.5k
16k
- 40 -
4
Input Test 3 Mode
(Push the button 3 times)
Check the Heater Voltage.
Is voltage 112~116V?
TEST MODE 3
CON3
6 th pin ~ 9 th pin
Yes
5
Input Test 1 Mode
(Push the button 1 times)
Check the Heater Voltage.
Is voltage 0V?
TEST MODE 1
CON3
6 th pin ~ 9 th pin
Yes
1. Check the
No
input Voltage
2. Replace
Main PCB
Voltage [V]
112V ~ 116V
Replace
No
Main PCB
Voltage [V]
0V