LG MLP-F8081CL Service Manual page 56

Troubleshooting Guide
5) No heating operation performed.
NO
ON/OFF S/W ON
56 Floor Standing Type Air Conditioner
Is the AC220V
(AC 240 V) between connector
(CN-outunit) and of Main
P.C.B
NO
Is the unit operating?
YES
Is it heating mode?
YES
Room temp <Set temp?
YES
Is the DC5V
at 14 pin of MICOM
YES
Is the DC5V at 18 pin of
MICOM
YES
Is the DC12V
at each terminal?
(RY-4way COIL)
YES
Is the
AC220V (AC 240 V) between connec-
tor(4WAY) and CN-outunit of Main
P.C.B
YES
Is the DC12V at
each terminal? (RY-Comp)
YES
Is the AC220V
(AC 240 V) between connector(CN-outunit)
and of Main
P.C.B
YES
Check the wiring diagram.
YES
Is the input power AC220V
(AC240V) at COMP magnetic coil
contactor?
Check the COMP magnetic
contactor of outdoor unit.
NO
Select the heating operation mode.
NO
Room temp. < Set temp. Setting
NO
Replacement MICOM
NO
Replacement MICOM
NO
Replacement IC02M
NO
Replacement RY-4way
NO
Replacement IC02M
NO
Replacement RY3
NO
YES
Check the wiring
connection