LG AP-Z Series - No Heating Operation

Electronic Parts Troubleshooting Guide
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2) No heating operation works
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
Reset the power
ON/OFF S/W ON
Is the AC220V
(AC 240 V) between connector
(CN-outunit)  and  of Main
P. C . B
Is the input power AC220V
(AC240V) at COMP magnetic coil
contactor?
Is it heating mode?
Room temp <Set temp?
Is the DC5V
at 14 pin of terminal MICOM
Is the DC5V
at 18 pin of terminal MICOM
Is the DC12V
at each terminal?
(RY-4WAY COIL)
Is the
AC220V (AC 240 V) between connec-
tor(4WAY) and CN-outunit  of Main
P. C . B
Is the DC12V at
each terminal? (RY-COMP
COIL)
Replacement RY-4WAY
Replacement IC02M
Replacement RY-COMP
Is the AC220V
(AC 240 V) between connector(CN-outunit)
 and  of Main
P. C . B
Check the wiring diagram.
Replacement MICOM
Replacement IC02M
Room temp. < Set temp. Setting
Replacement MICOM
Select the heating operation mode.
Check the COMP magnetic
contactor of outdoor unit.
Check the wiring
connection
Is the unit operating?