LG LFXS32726 Series - Page 89

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B4. LED blinks 7 times with IPM fault trip (IPM fault).
Measures depending on the trip and the number of LED blinks
BlinkOFFBlinkBlink BlinkBlink BlinkBlink
Purpose: To prevent over-current
due to IPM short-circuit or failure
 Cause: IPM short-circuit or failure
 Logic: Restart every 20 seconds after the compressor is turn ed off.
Check the
protection
logic
Check for IPM
fault trip or if
LED blinks
7 times (IPM fault)
Comp. does not
operate
Y
N
Recheck the inspection
procedure
Replace
the PCB
short
open
Check the
damage of IPM
with naked eyes
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Point A
Short
Check
Reset the
power
Rec
ord
୔ Replace PCBA if a short-circuit has
occurred either in ྙ
or ྚ.
Turn off
the
power
Remove
the
harness
Multi
Tester
ྙ
ྚ
Protection Logic
B5. LED blinks 8 times with Comp Txerror trip (communication error)
Measures depending on the trip and the number of LED blinks
BlinkBlink BlinkBlink BlinkBlink Blink
 Purpose: To detect failure in communication with the micomthat controls th e refrigerator set
 Cause: Communication error
 Logic: Blink the LED without tu rn ing off th e compressor
(operate th e compressor with th e command issued right before th e communication error).
Check the
protection
logic
LED blinks 8 times with
Comp Tx error trip
(communication error)
Check if the comp.
operates when the
C-fan does not operate
Y
N
Recheck the
inspection
procedure
Replace the
PCB
Reset the
power
OFF
Blink
Rec
ord
1. Check th e temperature & noise
of th e compressor and outlet.
2. Check if th e C-fan
operates normally.
Protection Logic