LG LMXC23746S - LED Blinks Once, then Repeats (FCT0 Fault); LED Blinks Two Times, then Repeats (Stroke Trip)

- 92 -
12-2 Check B
B1. LED blinks once, then repeats (FCT0 Fault)
-Purpose: Detecting motor current and voltage error
-Check voltage at point A( Motor Voltage), point B( Motor Current) andP oint C(Capacitor
Voltage) when compressor is off.
-Spec: Points A, B, &C 2.5V
0.3V
Protection Logic
Blink OFF Blink OFF
Y
N
Protection
logic
Check B
Blink 1 time
(FCT 0) Check B1
Out of spec?
(2.2 - 2.8V)
Reset Power
Replace Driver PCB
B2. LED blinks two times, then repeats (Stroke Trip)
Protection Logic
Blink Blink OFF Blink Blink OFF
Y
Y
Y
Y
Protection
logic
Check B
Blink 2 times
(Stroke Trip) Check B2
Compressor
Doesn’t work
Y
N
Compressor
Works Intermitte ntly
Capacitor
Spec.
Check C
Compressor
Damage
Check C
Replace
Capacitor
Replace
Compressor
N
N
Reset
Power
Stroke Trip
Occur?
Y
Repeat
Check Procedure
Harness
Connecting
Check C
Fix Harness
N
N
Cycle
Check E
Fix
Cycle
Replace
Driver PCB
OK
NG
-Purpose : Prevent abnormally long piston strokes.
-Case 1. If compresso r doesn’t work and LED blinks - Ca use: Possibly harness from compressor to PCB might be
defective.
-Case 2. If compressor works intermittently and LED blinks - Cause: Condenser Fan or Freezer Fan is not running. Sealed
system problem such as moisture restriction, restriction at capillary tube or refrigerant leak.
-Logic: Compressor is forced to off and then tries to restart after 1 minute.
B
GND
A
C
※ Devices should not be short-circuited when you check C