20
9-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit operates.
Outdoor unit does not
operate.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Indoor unit operates.
Outdoor unit does not
operate normally.
Indoor unit does not
receive the signal from
remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
blinking ON and OFF.
Outdoor unit
operates only
in Test Run
operation. *
Outdoor unit
does not
operate even
in Test Run
operation. *
Unit does not
operate nor-
mally in COOL
or HEAT mode
operation.
Indoor unit
operates, when
the emergency
operation switch
is pressed.
Indoor unit does
not operate, when
the emergency
operation switch
is pressed.
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/com-
pressor".
Refer to
"Check of R.V.
coil".
Refer to 9-6.
"Check of remote
controller and
indoor elec-
tronic control P.C.
board".
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
Blink ON
and OFF at
0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of se-
rial signal.
Upper lamp
2-time blink
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor.
Upper lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor.
Upper lamp
4-time blink
Cause:
Indoor unit
• Trouble
of indoor
unit control
system.
Upper lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power sys-
tem abnor-
mality.
Upper lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit.
Upper lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor con-
trol system.
Upper lamp
14-time blink
or more
Cause:
Outdoor unit
• Other ab-
normality
Start
Refer to
9-6. "How
to check mis-
wiring and
serial signal
error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer
to 9-7."Test
point diagram
and voltage".
Refer to
9-6. "Check
of indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
Refer to
"How to
check
inverter/com-
pressor".
Refer to
"Check of
outdoor ther-
mistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."
* "Test Run operation" means the
operation within 30 minutes
after the emergency operation
switch is pressed.
Refer to outdoor unit service manual.
OBH746D
Содержание MSZ-HM09NA
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