Service manual

53
7. TROUBLE SHOOTING
Outdoor unit does
not run?(note. 1)
Does
the compressor run
normally?
Indoor unit does
not run(note 1)
Check the failure
code according to
the self diagnostic
(note 2)
Is the unit
display
mormal?
check the failure
code according to
the self-diagonostic
(note 2)
Normal
check the
connecting
point of
magnetic
contactor
YES YES YES YES
NO
NO
YES
Trouble
Is the power
applied to the
unit
Is the
power normal?
check the voltage between
L & N of terminal
block
press the power ON/OFF
button on remote controller
Does the
beeper beep two
times?
Is the display
all off?
¥ Check the connector on display
PCB connected to control PCB
¥ Check the display PCB itself
Check power supply mains
or interconnection wires
Check the wiring of indoor
Is the
switch position
on switch pannel at
"Remote"
Does
control PCB
status LED repeat one
second "on and
off"?
¥ control PCB fault
¥ Micom or reset
IC fault
¥ Check the remote signal receiver
¥ Check the connection between signal
receiver and control PCB
Place the switch
position to the
"Remote" and then
Check it once
more
YES
NO
YES
NO
NO
NO NO
YES YES YES YES YES
NO
NO
NO
Is the
unit display
normal?