Mitsubishi MSZ-FA25VA Service Manual page 17

9-3. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
Outdoor unit
doesn't
operates in
operate
only Test Run
operation. w
even in
Test Run
operation. w
Check room Refer to
temperature "How to check
thermistor. inverter/
compressor".
Refer to 9-7.
"Test point
diagram and
voltage".
POWER lamp
All lamps
Flash on and off
Flash on and off
at 0.5-second
at 0.5-second
intervals
intervals
Cause: Cause:
Indoor unit
Indoor/
• The horizontal
Outdoor unit
vane is not
• Mis-wiring
installed
or trouble
correctly.
of serial signal
Refer to 9-6. Refer to 9-6.
E "Check of D "How to
installation of check of
the horizontal mis-wiring
vane". and serial
signal error
(when
outdoor unit
doesn't work)".
Indoor unit operates.
Outdoor unit doesn't
operate normally.
Indoor unit
Unit doesn't
operates, when
operate
EMERGENCY
normal
OPERATION
operation in
switch is pressed.
COOL or
HEAT mode.
Refer to
Refer to 9-6.B
"Check of
"Check of
R.V. coil".
remote controller
and receiver
P.C. board".
POWER lamp
POWER lamp
2-time flash
3-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room temp-
indoor fan
erature/
motor
indoor coil
thermistor
Refer to 9-6.
Check room
A "Check of
temperature
indoor fan
thermistor
motor".
and indoor
coil thermis-
tor.
Refer to 9-7.
"Test point
diagram and
voltage".
w"Test Run operation"
means the operation
within 30 minutes after
EMERGNCY OPERATION
switch is pressed.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
doesn't operate,
when
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to 9-6.C
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Left lamp
POWER lamp
of AREA lamp
5-time flash
4-time flash
Cause:
Cause:
Outdoor unit
Indoor unit
• Outdoor
• Trouble of
power
indoor unit
system
control abnormality
system
Refer to
Replace the
"How to check
indoor
electronic inverter/
compressor".
control
P.C. board.
17
If blinking of OPERATION
INDICATOR lamp cannot
be checked, it can be checked
with failure mode recall function.
OPERATION
OPERATION
INDICATOR
INDICATOR
lamp on the
lamp on the
indoor unit is
indoor unit
flashing on
stays off.
and off.
PLASMA/WASH lamp
2-time flash
cause:
Indoor unit
• Trouble of PLASMA
DEODORIZNG power
control or PLASMA AIR
PURIFYING power
control
Replace the indoor
electronic control P.C.
board.
As for outdoor unit MUZ type,
refer to service manual OB372.
As for outdoor unit MXZ type,
refer to service manual OB377.
POWER lamp
POWER lamp
7-time flash
6-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor
thermistor
control
in outdoor
system
unit
Refer to Replace the
"Check of inverter P.C.
outdoor board or
thermistors". the outdoor
electronic
control P.C.
board.
POWER lamp
14-time flash
Cause:
Outdoor unit
• Other
abnormality
Check
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."