LG LFXS30786 Series, Service Manual

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B4. LED blinks five times, then repeats (Locked Piston: A & E Inverters)
Protection Logic
Protection Logic
Blink Blink Blink Blink Blink OFF
Protection
logic
Check B
Blink 5 times
(Lock Piston Trip) Check B4
Compressor
Doesn't work
Repeat
Check Procedure
Reset
Power
Compressor
Doesn't work
N
Y
Replace
Compressor
Hi side
restriction
N
Y
Sealed
system
Repair
- 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.
B5. LED blinks six times, then repeats (Current Trip: A & E-Inverters)
Blink Blink Blink Blink Blink Blink OFF
Protection
logic
Check B
Blink 6 time
(Current Trip) Check B5
Compressor
Intermittently
works
N
IPM Check
Compressor
Damage
check
Replace
Compressor
N
Replace
Driver PCB
Reset
Power
Current trip
Occur?
N
N
Repeat
Check Procedure
Compressor
Doesn't works
Cycle blockage?
Replace
Compressor
Cycle
Check
Sealed system
Repair
Y
N
Y
Y
Y
Y
Y
N
- 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.