198 to 264 V AC?
198 to 264 V AC?
198 to 264 V AC?
NO
YES
NO
YES
NO
YES
Check the voltage between S1
and S2 on the terminal block
of the indoor unit which is used
to connect the indoor unit and
the outdoor unit.
Check the voltage among L(L
3
) and
N on the terminal block (TB1) of the
outdoor power circuit board.
Check the voltage between S1
and S2 on the terminal block
(TB1) of the outdoor unit which
is used to connect the indoor
unit and the outdoor unit.
•
Troubles concerning
power supply
• Check the power wiring
to the outdoor unit.
• Check the breaker.
• Bad wiring of the
outdoor controller
board
• The fuses on the
outdoor controller
circuit board are
blown.
• Check the wiring of the
outdoor unit.
• Check if the wiring is bad.
Check if the fuses are blown.
The fuses on the outdoor
controller circuit board will
be blown when the indoor
/outdoor connecting wire
short-circuits.
• Bad wiring of the
outdoor controller
board
• The fuses on the
outdoor controller
circuit board are
blown.
• Check if miswiring,
breaking
or poor contact is
causing this
problem.
Indoor/outdoor connecting
wire is polarized 3-core
type. Connect the indoor
unit and the outdoor unit
by wiring each pair of
S1, S2 and S3 on the both
side of indoor/outdoor
terminal blocks.
• The fuses on the
indoor controller
circuit board are
blown.
• Defective indoor
controller board
• Check if the fuses are
blown.
• Replace the indoor
controller board.
Symptoms: Nothing is displayed on the remote controller. 1
Diagnosis flow Cause
Inspection method and
troubleshooting
LED display of the indoor
controller board
LED1 :
LED2 :
LED3 :
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