MFZ-KJ Service Manual

26
9-4. TROUBLESHOOTING CHECK TABLE
OPERATION INDICATOR
Not lighted
Blinking
Lighted
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.
Left lamp flashes.
7-time flash
2.5-second OFF
Left lamp flashes.
14-time flash or more
2.5-second OFF
No.
1
2
5
6
SymptomOperation indicator lamp Condition
Remedy
Left lamp flashes.
0.5-second ON
0.5-second OFF
Miswiring
or serial
signal
Outdoor
power
system
Outdoor
thermistors
Outdoor
control
system
Indoor coil
thermistor
The serial signal from the outdoor unit is not
received for a maximum of 6 minutes.
It consecutively occurs 3 times that the
compressor 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
outdoor electronic control P.C. board.
5HIHUWR&KHFNRIRXWGRRU
 WKHUPLVWRU
Refer to the outdoor unit
service manual.
5HIHUWR&KHFNRILQYHUWHU
 FRPSUHVVRU
Refer to the outdoor unit
service manual.
 &KHFNWKHVWRSYDOYH
5HSODFHWKHLQYHUWHU3&
board or the outdoor electronic
control P.C. board.
Refer to the outdoor unit
service manual.
3
Indoor fan
motor
7
Abnormal
point
Room
tempera-
ture
thermistor
Left lamp flashes.
2-time flash
2.5-second OFF
The indoor coil or the room temperature
thermistor is short or open circuit.
5HIHUWRWKHFKDUDFWHULVWLFVRI
indoor coil thermistor, and the
room temperature thermistor
on 9-7.
Left lamp flashes.
3-time flash
2.5-second OFF
7KHURWDWLRQDOIUHTXHQF\IHHGEDFNVLJQDOLV
not emitted during the indoor fan operation.
5HIHUWR+RZWRFKHFN
miswiring and serial signal
 HUURU
5HIHUWR&KHFNRI
LQGRRUIDQPRWRU
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Left lamp flashes.
5-time flash
2.5-second OFF
Left lamp flashes.
6-time flash
2.5-second OFF
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Other
abnormality
An abnormality other than above mentioned is
detected.
&KHFNWKHVWRSYDOYH
&KHFNWKHZD\YDOYH
&KHFNWKHDEQRUPDOLW\LQ
detail using the failure mode
recall function.
Refer to the outdoor unit
service manual.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
8
4
Left lamp flashes.
4-time flash
2.5-second OFF
Indoor
control
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Indoor unit
and outdoor
unit do not
operate.
5HSODFHWKHLQGRRUHOHFWURQLF
control P.C. board.
Outdoor
control
system
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the
outdoor electronic control P.C. board.
&KHFNWKHEOLQNLQJSDWWHUQRI
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
9
Outdoor unit
does not
operate.
Left lamp lights up
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