LG GBB530***F Series Service Manual page 23

COMPRESSOR
3) LED blinks one time, then repeats (FCTO Trip)
• FCT0 : When same trip occurs after power reset, change PCB.
Because it is occurred by overvoltage (more than 2.5V) at voltage and
current sensing parts, PCB has to be changed.
Blink OFF Blink OFF
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