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MS-CP30VA
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Indoor unit operates.
Outdoor unit does
not operate.
Outdoor unit
Outdoor unit
operates only
does not
in Test Run
operate even
operation. *1
in "Test run
operation". *1
Check room
Check the
temperature
outdoor unit.
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Left lamp
Left lamp
Blink ON
2-time blink
and OFF at
Cause:
0.5-second
Indoor unit
intervals
• Trouble
Cause: In-
of room
door/ Out-
temperature
door unit
/ indoor coil
• Miswiring
thermistor
or trouble of
serial signal
Refer to 9-6.
Check room
"How to
temperature
check mis-
thermistor
wiring and
and indoor
serial signal
coil thermis-
error (when
tor. Refer to
outdoor unit
9-7. "Test
does not
point diagram
work)".
and voltage".
*1 "Test Run operation" means the operation within 30 minutes after the emergency operation switch is pressed.
If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function.
*2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit.
First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the air to flow into the
refrigerant circuit, or no blockage points (e.g. clogged or closed valves) in the refrigerant circuit that cause an increase
in pressure.
If there is no abnormal point like above and the system operates cooling mode normally, the indoor thermistor might
have a problem, resulting in false detection.
Check both the indoor coil thermistor and the room temperature thermistor, and replace faulty thermistor(s), if any.
(Do not start the operation again without repair to prevent hazards.)
OBH782A
Indoor unit does not
receive the signal from
remote controller.
Indoor unit
Indoor unit does
operates, when
not operate, when
the emergency
the emergency
operation switch
operation switch
is pressed.
is pressed.
1. Check indoor/out-
Refer to 9-6.
door connecting wire.
"Check of remote
(Check if the power is
controller and
supplied to the indoor
indoor electronic
unit.)
control P.C. board.
2. Refer to 9-6.
of indoor P.C. board
and indoor fan motor".
Left lamp
Left lamp
3-time blink
4-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble
indoor fan
of indoor
motor
unit control
system
Refer to
Replace the
9-6. "Check
indoor elec-
of indoor fan
tronic control
motor".
P.C. board.
24
Refer to outdoor unit service manual.
OPERATION INDICATOR
lamp on the indoor unit is
blinking ON and OFF.
"Check
Left lamp
Left lamp
6-time blink
7-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble
thermistor
of outdoor
in outdoor
control
unit
system
Refer to
Replace the
"Check of
deicer P.C.
outdoor ther-
board.
mistors".
Left lamp 14-
time or more
blink
Cause:
Outdoor unit
• Other ab-
normality
Indoor/out-
door unit
• Trouble of
thermistors
*2
• Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."
• Check
thermistors.
Refer to
"Test point
diagram and
voltage" in
the service
manual of
indoor and
outdoor unit.
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