Mitsubishi Electric MSZ-GC22VA Service Manual page 17

10-3. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
Outdoor unit
operates only
doesn't
in Test Run
operate
operation.
even in
w Test Run
operation.
Refer to
Check room
"How to check
temperature
inverter/
thermistor.
compressor".
Refer to 10-7.
"Test point
diagram and
voltage".
Upper 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 10-6. Refer to 10-6.
E "Check of D "How to
installation of check of
the horizontal mis-wiring
vane". and serial
signal error".
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.
w
Refer to
Refer to 10-6.B
"Check of
"Check of
R.V. coil".
remote controller
and indoor
electronic control
P.C. board".
Upper lamp
Upper 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 10-6.
Check room
A "Check of
temperature
indoor fan
thermistor
motor".
and indoor
coil thermis-
tor.
Refer to 10-7.
"Test point
diagram and
voltage".
Indoor unit
OPERATION INDICATOR
doesn't receive
lamp on the indoor unit is
the signal from
flashing on and off.
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 10-6.C
"Check of indoor
P.C. board and indoor
fan motor".
Upper lamp
Upper lamp
4-time flash
5-time flash
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble of
• Outdoor
indoor unit
power
control
system
system
abnormality
Refer to
Replace the
"How to check
indoor
inverter/
electronic
control compressor".
P.C. board.
17
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
w
"Test Run operation" means the
operation within 30 minutes after
EMERGENCY OPERATION switch
is pressed.
Refer to outdoor unit service manual.
Upper lamp
Upper 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.
Upper lamp
14-time flash
Cause:
Outdoor unit
• Other
abnormality
Check
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."