16
No.
1
2
4
5
6
Symptom
Operation indicator lamp
Detection method
Check point
Left lamp flashes.
0.5-second ON
0.5-second OFF
Mis-Wiring
or serial
signal
Outdoor
power
system
Outdoor
thermistors
Outdoor
control
system
Indoor coil
thermistor
3 minutes after power supply turns ON, when
the serial signal is not received.
When it consecutively occurs 3 times that
compressor stops for overcurrent protection
within 1 minute after start-up.
<Thermistor short>
Thermistors are abnormal when they short
after compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open
after compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more
than 10 minutes after compressor start-up.
When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or the outdoor electronic control P.C. board.
• Shortage of refrigerant
• Refer to "Check of outdoor
thermistor".
Refer to service manual
OB391 or OB319.
• Refer to "Check of inverter/
compressor".
Refer to service manual
OB391 or OB319.
• Replace the inverter P.C.
board or the outdoor
electronic control P.C. board.
Refer to service manual
OB391 or OB319.
• Refer to 9-6.
D
"How to check
mis-wiring and serial signal
error".
3
Indoor fan
motor
7
Abnormal
point
Outdoor unit
does not
operate.
Room
tempera-
ture
thermistor
Left lamp flashes.
2-time flash
2.5-second OFF
When the indoor coil themistor or the room
temperature thermistor is short or open circuit
every 8 seconds during operation.
• Refer to the characteristics of
the indoor coil thermistor, and
the room temperature
thermistor
(9-7.).
Left lamp flashes.
3-time flash
2.5-second OFF
Indoor fan
repeats 12
seconds ON
and 3
minutes
OFF.
When the
indoor fan
breaks, the
fan keeps
stopping.
When the rotational frequency feedback
signal is not emit during 12-second indoor fan
operation.
• Refer to 9-6.
A
"Check of
indoor fan motor".
Left lamp flashes.
4-time flash
2.5-second OFF
Indoor
control
system
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
• Replace the indoor electronic
control P.C. board.
Left lamp flashes.
5-time flash
2.5-second OFF
Left lamp flashes.
6-time flash
2.5-second OFF
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
Outdoor unit
does not
operate.
0.5-second ON
0.5-second OFF
When the electricity is not conducted to the
safety device (FAN) of the horizontal vane.
• Refer to 9-6.
E
"Check of
installation of the horizontal
vanes".
Indoor unit
and outdoor
unit do not
operate.
Attachment
of the
horizontal
vane
Both lamps flash at the same time.
8
Operation Indicator
MXZ type
Operation
mode
setting
Lighted
Blinking
Outdoor unit
operates but
indoor unit
does not
operate.
When the operation mode of each indoor unit
is differently set to COOL(includes DRY) and
HEAT at the same time, the operation mode of
indoor unit that has operated at first has the
priority.
• Unify the operation mode.
Refer to service manual
OB319.
2.5-second OFF
Right lamp flashes
Left lamp flashes.
7-time flash
2.5-second OFF
9-4. Troubleshooting check table
NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
Self check table
Operation Indicator
· Flashing of the OPERATION INDICATOR lamp (left-hand side or both lamp)
indicates possible abnormalities.
· The OPERATION INDICATOR lamp (left-hand side lamp) is
lighting during normal operation.
Lighted
Not lighted
• The following indication applies regardless of shape of the indicator.
Blinking
OB390--1qxp 05.2.9 11:27 Page 16
Summary of Contents for MSZ-CA25VB
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