Mitsubishi Electric M Series Manual page 160

WALL-MOUNTED Inverter Heat Pump
MSZ-FD25VA MSZ-GE22VA
MSZ-FD25VAS MSZ-GE25VA
MSZ-FD35VA MSZ-GE35VA
MSZ-FD35VAS MSZ-GE42VA
MSZ-FD50VA MSZ-GE50VA
MSZ-FD50VAS
Troubleshooting check table
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.
MSZ-FD
L AREA R POWER
Abnormal
No.
Operation indicator lamp
point
POWER/Upper/Left lamp flashes.
0.5-second ON
Miswiring
1
or serial
signal
0.5-second OFF
Indoor coil
POWER/Upper/Left lamp flashes.
thermistor
2-time flash
2
Room
temperature
thermistor
2.5-second OFF
POWER/Upper/Left lamp flashes.
3-time flash
Indoor fan
3
motor
2.5-second OFF
POWER/Upper/Left lamp flashes.
Indoor
4-time flash
4
control
system
2.5-second OFF
POWER/Upper/Left lamp flashes.
5-time flash
Outdoor
5
power
system
2.5-second OFF
POWER/Upper/Left lamp flashes.
6-time flash
Outdoor
6
thermistors
POWER/Upper/Left lamp flashes.
Outdoor
7-time flash
control
7
system
POWER/Upper/Left lamp flashes.
14-time flash
Other
8
abnormality
2.5-second OFF
MSZ-FD, MSZ-GE, MSZ-HC, MSZ-SF
Outdoor
POWER/Upper/Left lamp lights up.
9
control
system
C-158
MSZ-GE60VA
MSZ-GE71VA
MSZ-GE
MSZ-HC
CLEAN PLASMA OPERATION INDICATOR OPERATION INDICATOR
Symptom
Indoor unit
and outdoor
unit do not
operate.
2.5-second OFF
2.5-second OFF
Outdoor unit
does not
operate.
MSZ-HC25VA MSZ-SF15VA
MSZ-HC35VA MSZ-SF20VA
MSZ-HC35VAB
MSZ-SF
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
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.
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
outdoor electronic control P.C. board.
M series
Lighted
Blinking
Not lighted