LG LFX28968D Service Manual page 80

B3. LED blinks five times, then repeats (Locked Piston)
Blink Blink Blink Blink Blink OFF
- Purpose: To detect locked piston
- Cause: Lack of oil to the cylinder, cylinder or piston damaged and or restricted discharge.
A Locked Piston can also be caused by foreign materials inside the compressor.
- Logic: Compressor is forced off and tries to restart within 2.5 minutes.
Protection
logic
(Lock Piston Trip) Check B3
Check B
B4. LED blinks six times, then repeats (Current Trip)
Blink Blink Blink Blink Blink Blink
- Purpose: Prevent over-current (overload protect)
- Cause: Ambient temperature is high (over 43°C) and/or refrigerator's condenser air movement is restricted.
- Condenser Fan is stopped, restricted discharge line, compressor is damaged, or IPM device is defective.
- Logic: Compressor is forced off and tries to restart after 6 minutes.
Protection
logic
Check B
Fix Cycle
Cycle Check E
Repeat
Check Procedure
Blink 5 times
Compressor
Doesn't work
Repeat
Check Procedure
OFF
Blink 6 time
(Current Trip) Check B4
NG
Y
Replace
Driver PCB
Y
N
Current trip
Occur?
Reset Compressor
Doesn't work
Power
N
Y
Compressor
Intermittently
works
N
IPM
Check B5
Y
Reset
Power
- 35 -
Protection Logic
Replace
Compressor
N
Y
Hi side
restriction
Y
Sealed
system
Repair
Protection Logic
NG
Capacitor
Spec.
Capacitor
Check C2
Y
Compressor NG
Replace
Damage
Compressor
Check C3
Y
Replace