Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 264

Resolución de averías
2. Indoor unit failure mode table
Upper lamp of OPERATION
INDICATOR lamp
Not lighted
1-time flash
every 0.5-second
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
11-time flash
2.5-second OFF
12-time flash
2.5-second OFF
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (10-4.).
264
Abnormal point
(Failure mode)
Normal
The room temperature thermistor short
Room temperature
or open circuit is detected every 8
thermistor
seconds during operation.
The indoor coil thermistor short or open
circuit is detected every 8 seconds during
Indoor coil thermistor
operation.
The serial signal from outdoor unit is
Serial signal
not received for a maximum of 6 minutes.
The rotational frequency feedback
signal is not sent out for 12-seconds after
Indoor fan motor
indoor fan motor operated.
It cannot properly read data in the
nonvolatile memory of the indoor electronic
Indoor control system
control P.C. board.
Condition
—
Refer to the characteristics of the room
temperature thermistor (10-7.).
Refer to the characteristics of the indoor
coil thermistor (10-7.).
Refer to 10-6.D "How to check mis-wiring
and serial signal error".
Refer to 10-6.A "Check of indoor fan
motor".
Replace the indoor electronic control
P.C. board.
Correspondence
—