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AC 187V to AC 253V?
AC 187V to AC 253V?
AC 187V to AC 253V?
DC 12V to DC 16V?
DC 12V to DC 16V?
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
Check the voltage between S1
and S2 on the terminal block
(TB4) of the indoor unit.
Check the voltage among L1 and L2
on the terminal block (TB1) of the
outdoor power circuit board.
Check the voltage of indoor
controller board (CN2D).
Check the voltage of the unit after
removing the indoor power board
(CN2S).
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.
• Defective indoor
power board
• Replace the indoor
power board.
• Defective indoor
controller board
• Replace the indoor
controller board.
• Miswiring, breaking
or poor connection of
indoor/outdoor
connecting wire
•
Check if there is miswiring
or breaking of wire.
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 :
OCH429--2.qxp 07.11.20 9:18 AM Page 48