LG Electronics LF300CP(LP-C303R20), LF480CE(LP-C483TA0) service manual No heating operation works

7) No heating operation works

NO

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

NO

Is the unit operating?

YES

Is it heating mode?

YES

Is the input power AC220V (AC240V) at COMP magnetic coil contactor?

YES

Check the COMP magnetic contactor of outdoor unit.

NO

NO

Check the wiring

connection

YES

Room temp <Set temp?

YES

Is the DC5V

at 14 pin of Micom terminal

YES

Is the DC5V

at 18 pin of Micom terminal

YES

Is the DC12V

at each terminal? (RY-4way COIL)

YES

Is the

AC220V (AC 240 V) between connector(4WAY) and CN-outunit Pin 1 of Main

P.C.B

YES

Is the DC12V at each terminal?

YES

Is the AC220V

(AC 240 V) between connector(CN-outunit)

Pin 1 and Pin 3 of Main

P.C.B

Select the heating operation mode.

NO

Room temp. < Set temp. Setting

NO

Replacement MICOM

NO

Replacement MICOM

NO Replacement ICO2M

NO

Replacement RY-4way

NO Replacement ICO2M

NO

Replacement RY-Comp

YES

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