7) no heating operation works – LG LF300CP(LP-C303R20) User Manual
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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 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 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 Check the wiring connection Is the unit operating?
P.C.B
contactor of outdoor unit.