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Electronic Parts Troubleshooting Guide
1) No cooling operation performed.
NO
ON/OFF S/W ON
Is the AC220V
(AC 240 V) between Connector(CN-
outunit)
and
of Main
P.C.B
NO
Is the unit operating?
YES
Is it Cooling mode?
YES
Room temp, > Set temp?
YES
Is the DC5V at 14
pin of IC1(MICOM)
YES
Replacement ICO2M, RY-Comp
YES
Is the input power
AC220V (AC240V) at COMP
Magnetic coil?
Check the magnetic
contactor of outdoor unit.
NO
Select the cooling
operation mode.
NO
Room temp, >set temp
setting
NO
Replacement (MICOM)
Troubleshooting Guide
NO
YES
Check the wiring
diagram.
Service Manual 53
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