16
11-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates.
But indoor
unit doesn't
blow out
cool air.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION
INDICATOR
lamp on the
indoor unit is
flashing on
and off.
Outdoor unit
operates in
only Test Run
operation.
Outdoor unit
doesn't
operate
even in
Test Run
operation.
Indoor unit
operates,
when the
EMERGENCY
OPERATION
switch is
pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is
pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage".
Refer to
A
"Check of
outdoor unit"
on page 18.
Refer to
"Check of
remote
controller
and receiver
P.C. board".
Flash on and
off at 0.5-second
intervals
Cause:
Wrong setting
of switch (SW2-
2
)
on the electronic
control P.C. board.
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage".
Refer to
"Check of
indoor fan
motor".
Refer to
C
"Check of
MU & MUX TYPE /
MUH & MXZ TYPE
SWITCH OVER "
(When
outdoor unit
doesn't work.)
on page 19.
1. Check indoor /
outdoor
connecting wire.
2. Refer to
"Check of indoor
electronic control
P.C. board".
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Refer to
B
"Check of
outdoor unit"
on page 19.
Refer to
D
"Check of
indoor / outdoor
units' connection
and outdoor unit"
on page 19.
As for indoor unit, refer to service manual
OB307 REVISED EDITION-A.
MUX-A22WV -
E1
OB318--1.qxp 03.10.30 0:55 PM Page 16
