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
.
OPERA
TION lamp on the
remote controller flashing
on and of
f.
Outdoor unit
operates in
only T
est
Run
operation.
Outdoor unit
doesn't
operate
even in
T
est Run
operation.
Check room
temperature
thermistor
.
Refer to
"T
rouble
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
HEA
T
mode.
Refer to
Q
"Check of
R.V
. coil"
on page 61.
6800
1503
5101
0405
4210
6831~6834
5102
• 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
.
• T
rouble
of
the condenser
/evaporator
temperature
thermistor
.
• T
rouble
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
.
• T
rouble
of
the room
temperature
thermistor
.
• T
rouble
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.
• T
rouble
of
the pipe
temperature
thermistor/liquid.
• T
rouble
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
.
• T
rouble
of
the outdoor
thermistor
.
• T
rouble
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
• T
rouble
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
