LG LFX28978 series Service Manual page 29

8-5 Defrost Heater Error (Er dH)
No
1 Check the Door gasket.
2 Check the Defrost control part.
3 Input Test 3 Mode.
(Push the button 3 times)
4 Check the Blue to Orange.
<CON3>
5 Release the test mode.
Push the button 1 times. (Normal)
6 Check the Blue to Orange.
<CON3>
Checking flow
Fuse
M
Def Heater
Result & SVC Action
Part
Fuse-M
Def
34~42
Def
Sensor
Heater
Def
Sensor
Result
112 ~ 116 V
0 V
Result
0 V
112 ~ 116 V
- 29 -
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
OFF
SVC Action
Go to the 5
Replace Main PCB
SVC Action
Explain to customer
Replace Main PCB