LG AP-Z Series - No Heater Operation

40 Floor Standing Type Air Conditioner
Electronic Parts Troubleshooting Guide
3) No heater operation works
YES
NO
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"
Heater S/W "ON"
Replacement MICOM
Replacement IC02M
Replacement RY-HEATER
Is the heater S/W of Main
PCB"ON"?
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
of
Main P.C.B
Check the heater wiring
Select the heating operation mode.
Compressor "ON"