46
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Nothing is displayed
on remote controller.
OPERATION lamp on the
remote controller flashing
on and off.
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Check room
temperature
thermistor.
Refer to
"Trouble
criterion of
main parts".
Refer to O
"Check of
inverter/
compressor"
on page 59.
1. Check indoor / remote
controller connecting
wire.
2. Refer to
"TROUBLESHOOTING".
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to Q
"Check of
R.V. coil"
on page 61.
6800 15035101 0405 4210 6831~68345102
• Check the
wiring out
between the
remote controller
and indoor unit.
• Exchange
the remote
controller and
indoor controller
board.
Cause:
Indoor unit
• Mis-
connecting of
the condenser
/evaporator
temperature
thermistor.
• Trouble of
the condenser
/evaporator
temperature
thermistor.
• Trouble of
the indoor
controller
board.
Cause:
Outdoor unit
• Short cycle
of air cycle
• Dirty air filter
• Damaged fan
• Abnormal
refrigerant
Cause:
Indoor unit
• Mis-
connecting of
the room
temperature
thermistor.
• Trouble of
the room
temperature
thermistor.
• Trouble of
the indoor
controller
board.
• Reinsert the
connector
(CN20)
• Check the
resistance value
of the thermistor
• Exchange
the indoor
controller board
Cause:
Indoor unit
• Mis-
connecting
of the pipe
temperature
thermistor/liquid.
• Trouble of
the pipe
temperature
thermistor/liquid.
• Trouble of
the indoor
controller
board.
• Reinsert the
connector
(CN21)
• Check the
resistance value
of the thermistor
• Exchange
the indoor
controller board
• Reinsert the
connector
(CN29)
• Check the
resistance value
of the thermistor
• Exchange
the indoor
controller board
Cause:
Outdoor unit
• Miss-
connecting of
the outdoor
thermistor.
• Trouble of
the outdoor
thermistor.
• Trouble of
the outdoor
electronic
control P.C.
board.
• Reinsert the
connector
• Check the
resistance value
of the thermistor
• Exchange
the outdoor
electronic
control P.C.
board.
Cause:
Indoor unit
remote
controller
• Signal error
between
remote
controller and
Indoor units
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
• Refer to O
"Check of
inverter/
compressor"
on page 59.
• Clear
obstructions
from air cycle.
• Clear the air
filter.
•
Check the fan
• Check the
refrigerant
temperature.
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
• Exchange
the outdoor
electonic
control P.C.
board and
others.
As for indoor unit SEZ type,
refer to service manual OC303.
Cause:
Indoor /
Outdoor unit
•
Indoor-Outdoor
signal error
Check the
outdoor
electronic
control P.C.
board.
Refer to "U
How to check
mis-wiring and
serial error
(when outdoor
unit does not
work)"
on page 65.
Cause:
Indoor /
Outdoor unit
• Mis-wiring
Check the
wiring out
between the
indoor and
outdoor.
Refer to "U
How to check
mis-wiring and
serial error
(when outdoor
unit does not
work)"
on page 65.
Exchange the
indoor
controller
board.
Refer to "U
How to check
mis-wiring and
serial error
(when outdoor
unit does not
work)"
on page 65.
12-2. Instruction of troubleshooting (4)
(SEZ-A18AR.TH / SUZ-A18VR.TH)
(SEZ-A24AR.TH / SUZ-A24VR.TH)
OC304A --2qxp 04.6.29 8:34 AM Page 46
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