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9-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection
after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR
lamp flashing.
OPERATION INDICATOR
MSZ-FE09NA MSZ-FE12NA
L AREA R
POWER
Abnormal
No.
Operation indicator lamp
point
POWER lamp/Upper lamp ashes.
0.5-second ON
Miswiring
1
or serial
signal
0.5-second OFF
POWER lamp/Upper lamp ashes.
Indoor coil
2-time ash
thermistor
2
Room tem-
perature
2.5-second OFF
thermistor
POWER lamp/Upper lamp ashes.
3-time ash
Indoor fan
3
motor
2.5-second OFF
POWER lamp/Upper lamp ashes.
4-time ash
Indoor con-
4
trol system
2.5-second OFF
POWER lamp/Upper lamp ashes.
5-time ash
Outdoor
5
power sys-
tem
POWER lamp/Upper lamp ashes.
6-time ash
Outdoor
6
thermistors
POWER lamp/Upper lamp ashes.
7-time ash
Outdoor
7
control sys-
tem
POWER lamp/Upper lamp ashes.
14-time ash
Other ab-
8
normality
2.5-second OFF
Outdoor
9
control sys-
POWER lamp/Upper lamp lights up
tem
POWER lamp: MSZ-FE09/12NA
Upper lamp: MSZ-FE18NA
MSZ-FE18NA
Symptom
Indoor unit and
outdoor unit do
not operate.
2.5-second OFF
2.5-second OFF
2.5-second OFF
Outdoor unit
does not oper-
ate
Lighted
Blinking
Not lighted
Condition
The serial signal from the outdoor unit is not
received for 6 minutes.
The indoor coil or the room temperature
thermistor is short or open circuit.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
It consecutively occurs 3 times that the com-
pressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
The outdoor thermistors short or open circuit
during the compressor operation.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the out-
door electronic control P.C. board.
An abnormality other than above mentioned
is detected.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the out-
door electronic control P.C. board.
26
Remedy
•
Refer to 9-6.
"How to check
miswiring and serial signal er-
ror".
•
Refer to the characteristics of
indoor coil thermistor, and the
room temperature thermistor
(9-7).
•
Refer to 9-6.
"Check of in-
door fan motor".
•
Replace the indoor electronic
control P.C. board.
•
Refer to "How to check of in-
verter/compressor".
Refer to outdoor unit service
manual
•
Check the stop valve.
•
Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
•
Replace the inverter P.C. board
or the outdoor electronic con-
trol P.C. board.
Refer to outdoor unit service
manual.
•
Check the stop valve.
•
Con rm the abnormality in
detail using the failure mode
recall function for outdoor unit.
•
Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
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