Mitsubishi MSZ-FA25VA Service Manual page 19

NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
Self check table
Abnormal
No. Operation indicator lamp
point
Left lamp of AREA lamp flashes.
Indoor
4-time flash
control
1
system
2.5-second OFF
Abnormal
No.
Operation indicator lamp
point
All lamps flash at the same time.
Attachment
of the 0.5-second ON
1
horizontal
vane
0.5-second OFF
Abnormal
No.
Operation indicator lamp
point
Both lamps flash
MXZ type
Operation
1
mode
2.5-second OFF
setting
Abnormal
No. Operation indicator lamp
point
PLASMA
PLASMA/WASH lamp flashes.
DEODORIZING/
2-time flash
PLASMA
1
AIR
PURIFYING
power control
2.5-second OFF
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.
· Flashing of AREA lamp(left-hand side lamp) indicates abnormality.
Lighted
Blinking
Not lighted
Symptom
Indoor unit
and outdoor
unit do not
operate.
· Flashing of All lamps indicate abnormality.
Lighted
Blinking
Not lighted
Symptom
Indoor unit
and outdoor
unit do not
operate.
· Flashing of AREA lamp(both lamps) indicates abnormality.
Lighted
· POWER lamp is lighted.
Blinking
Not lighted
Symptom
Outdoor unit
operates but
indoor unit
does not
operate.
· Flashing of PLASMA/WASH lamp indicates abnormality.
Lighted
Blinking
Not lighted
Symptom
Indoor unit
and outdoor
unit do not
operate.
Detection method
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Detection method
When the electricity is not conducted to the
interlock switch (Fan) of the horizontal vane.
Detection method
When the operation mode of the each indoor
unit is differently set to COOL(includes DRY)
and HEAT at the same time, the operation
mode of the indoor unit that has operated at
first has the priority.
Detection method
When PLASMA DEODORIZING power or
PLASMA AIR PURIFYING power can not be
turned OFF.
19
Check point
• Replace the indoor electronic
control P.C. board.
Check point
• Refer to 9-6.E "Check of
installation of the horizontal
vane".
Check point
• Unify the operation mode.
Refer to service manual
OB377.
Check point
• Replace the indoor electronic
control P.C. board.