LG LFXS30726S Service Manual page 38

Defrost Heater Error (r dH)
1
Check the Door gasket .
Is door gasket damaged?
No
2
Is the Connector Properly
connected?
Yes
Is the resistance value of
3
Fuse-M less than 0.2Ω?
Fuse - M Heater
Yes
4
Is the resistance value of
Heater as follow?
Heater
Measurement Point
(1)
Yes
Replace the
Yes
Door gasket
Reconnect
No
Change
Fuse-M
No
Replace
No
Heater
Resistance [Ω]
76~89
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5
Is the resistance value of defrost
sensor as follow?
Resistance is influenced by
temperature.
CON7
19 th pin ~ 20 th pin
23ºF / -5ºC
32ºF / 0ºC
41ºF / 5ºC
50ºF / 10ºC
59ºF / 15ºC
Yes
6
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
7
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
8
Explain to customer
Replace
No
Defrost
Sensor
Sensor
Resistance [Ω]
38k
30k
24k
19.5k
16k
1. Check the
No
input Voltage
2. Replace
Main PCB
Voltage [V]
112V ~ 116V
Replace
No
Main PCB
Voltage [V]
0V