LG LF300CP(LP-C303R20) - Manual (Page 39)

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7) 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
ON/OFF S/W ON
Is the AC220V
(AC 240 V) between connector
(CN-outunit) Pin 1 and Pin 3 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 Micom terminal
Is the DC5V
at 18 pin of Micom terminal
Is the DC12V
at each terminal?
(RY-4way COIL)
Is the
AC220V (AC 240 V) between
connector(4WAY) and CN-outunit Pin 1 of
Main
P.C.B
Is the DC12V at
each terminal?
Replacement RY-4way
Replacement ICO2M
Replacement RY-Comp
Is the AC220V
(AC 240 V) between connector(CN-outunit)
Pin 1 and Pin 3 of Main
P.C.B
Replacement MICOM
Replacement ICO2M
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?