Mitsubishi Mr.Slim MFZ-KA09NA - Troubleshooting Check Table

20
9-4. TROUBLESHOOTING CHECK TABLE
NOTE: When the indoor unit has started operation and the above failures are detected (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.
Left lamp flashes.
7-time flash
2.5-second OFF
Left lamp flashes.
14-time flash
Left lamp flashes.
15-time flash
2.5-second OFF
2.5-second OFF
No.
1
3
6
7
SymptomOperation indicator lamp Check point
Countermeasure
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
When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.
The compressor stops 3 times consecutively
for over current protection or start-up failure
protection within 1 minute after start-up.
When the outdoor thermistors short or open
circuit during the compressor operation.
When it cannot properly read data in the
nonvolatile memory of the outdoor electronic
control P.C. board.
5HIHUWR&KHFNRIRXWGRRU
 WKHUPLVWRU
5HIHUWRRXWGRRUXQLWVHUYLFH
manual.
5HIHUWR&KHFNRILQYHUWHU
 FRPSUHVVRU
5HIHUWRRXWGRRUXQLWVHUYLFH
manual.
Check the stop valve.
5HSODFHWKHRXWGRRU
electronic control P.C. board.
 5HIHUWRRXWGRRUXQLWVHUYLFH
manual.
4
Indoor fan
motor
8
Abnormal
point
5RRP
tempera-
ture
thermistor
Left lamp flashes.
2-time flash
2.5-second OFF
When the indoor coil or the room temperature
thermistor is shorts or opens 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
When the rotational frequency feedback
signal is not emitted during the indoor fan
operation.
5HIHUWR+RZWRFKHFN
mis-wiring 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DEQRUPDOLW\LQ
detail using the failure mode
recall function.
5HIHUWRRXWGRRUXQLWVHUYLFH
manual.
5HIHUWR&KHFNRI
GDPSHU
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
9
Indoor
damper
When the damper is not located
at the designated position.
Indoor unit
and outdoor
unit do not
operate.
10
5
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.
Indoor unit
and outdoor
unit do not
operate.
5HSODFHWKHLQGRRUHOHFWURQLF
control P.C. board.
Outdoor
control
system
When it cannot properly read data in the
nonvolatile memory of the outdoor electronic
control P.C. board.
&KHFNWKHEOLQNLQJSDWWHUQRI
the LED on the outdoor
electronic control P.C. board.
2
Outdoor unit
does not
operate.
Left lamp lights up
NOTE: Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
OPERATION INDICATOR
Not lighted
Blinking
Lighted
· Flashing of OPERATION INDICATOR lamp (left-hand side lamp)
indicates abnormalities.
Self check table
OBH568A