Mitsubishi Electric MSH-XV07UV Service Manual page 41

10-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
doesn't
Outdoor unit
operate
operates in
even in
only Test Run
Test Run
operation.
operation.
Check room
temperature
Refer to D
thermistor.
"Check of
Refer to
outdoor unit"
"Test point
on page 46.
diagram and
voltage" on
page 49.
1-time flash
Flash on and
Cause:
off at 0.5-
Indoor/
second interval
Outdoor unit
Cause:
• Trouble of
Indoor/
serial signal
Outdoor unit
• Mis-wiring
Refer to F "How to
check mis-wiring and
sirial singal error
(When outdoor unit
doesn't operate)"
on page 47.
1
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Outdoor
Unit doesn't
unit doesn't
operate
stop even
normal
if indoor unit
operation in
stops.
COOL or
HEAT mode.
Refer to H
Refer to E
"Check of
"Check of
R.V. coil"
outdoor unit"
on page 48.
on page 46.
2-time flash
3-time flash
Cause:
Cause:
Indoor unit
• Trouble of
Indoor unit
room temp-
• Trouble of
erature/
indoor fan
indoor coil
motor
thermistor
Refer to A
Check room
"Check of
temperature
indoor fan
thermistor
motor"
and indoor
on page 44.
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage"
on page 49.
1<The case of the trouble of the serial signal>
When the power is turned off and then turned on
again, the indication shows "the trouble of mis-
wiring."
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 44.
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Refer to G
"Check of
outdoor
thermistor"
on page 48.
41
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 45.