LG AP-Z Series - No Heating Operation

Service Manual 39
Electronic Parts Troubleshooting Guide
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?