MITSUBISHI ELECTRIC MSZ-FA35VA - Manual (Page 18)

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NOTE : When the indoor unit has started operation and the above 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.
No.
1
3
5
6
Symptom Operation indicator lamp Detection method Check point
POWER 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
When the serial signal form the outdoor unit is
not received for a maximum of 6 minutes.
When it consecutively occurs 3 times that the
compressor stops for overcurrent protection or
start-up failure protection witth in 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 inverter P.C. board
or the outdoor electronic control P.C. board.
• Refer to "Check of outdoor
thermistor".
Refer to service manual
OB372 or OB377.
• Refer to "Check of inverter/
compressor".
Refer to service manual
OB372 or OB377.
Check the stop valve.
• Replace the inverter P.C.
board or the outdoor
electronic control P.C. board.
Refer to service manual
OB372 or OB377.
• Refer to 9-6. D "How to check
mis-wiring and serial signal
error".
4
Indoor fan
motor
7
Abnormal
point
Outdoor unit
does not
operate.
Room
tempera-
ture
thermistor
POWER lamp flashes.
2-time flash
2.5-second OFF
When the indoor coil or the room temperature
thermistor is short or open circuit. • Refer to 9-7.the
characteristics of indoor coil
thermistor, and the room
temperature thermistor.
POWER lamp flashes.
3-time flash
2.5-second OFF
When the rotational frequency feedback
signal is not emit during the indoor fan
operation.
• Refer to 9-7. A "Check of
indoor fan motor".
Indoor unit
and outdoor
unit do not
operate.
POWER lamp flashes.
5-time flash
2.5-second OFF
POWER 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
abnonmality An abnormality other than above mentioned is
deteced.
• Confirm the abnormarity in
detail using the failure mode
recall function. Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
8
Outdoor
control
system When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or the outdoor electronic control P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor lectronic
control P.C. board.
2
Outdoor unit
does not
operate.
POWER lamp flashes.
7-time flash
2.5-second OFF
POWER lamp flashes.
14-time flash
2.5-second OFF
POWER lamp lights up
9-4. Troubleshooting check table
NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
Self check table
Lighted
Blinking
Not lighted
· Flashing of POWER lamp indicates abnormalities.
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