LG GB7143**AV Series Service Manual page 20

4) LED blinks five times, then repeats (Locked Piston)
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 Blink 5 times
logic (Lock Piston Trip)
Check B
Compressor
Doesn't work
Check B3
Reset
Power
Repeat
Check Procedure
Compressor
Doesn't work
N
- 20 -
Replace
Compressor
N
Y
Hi side
restriction
Y
Sealed
system
Repair