LG LF300CP(LP-C303R20) - Manual (Page 40)

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8) No heater operation works
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Is the heating operating?
Is the Compressor
operating?
Is the Heat S/W of Main
PCB "ON"?
Heat S/W "ON"
Replacement MICOM
Replacement ICO2M
Replacement RY-Heater
Is the DC 5V at 15 pin of
MICOM
Is the
DC 12V at eack terminal?
(RY-Heater COIL)
Is the
AC220V (AC 240 V) between
connector(HEATER) and CN-outunit Pin 1
of Main P.C.B
Check the heater wiring
Select the heating operation mode.
Compressor "ON"