Mitsubishi Electric MCFH-GA35VB Service Manual page 13

9-3. Troubleshooting check table
OPERATION
INDICATOR
lamp
Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
Abnormal
NO. Indication
point
0.5-second ON
Mis-wiring
or Serial
1
signal
0.5-second OFF
Indoor coil
2-time flash
thermistor
2
Room
tempera-
2.5-second OFF
ture ther-
mistor
4-time flash
Indoor
control
3
P.C.
board
2.5-second OFF
6-time flash
Outdoor
4
thermistor
MCFH-
7-time flash
GA60VB
MXZ type
5
Outdoor
control
P.C.
board
5-time flash
MXZ type
Outdoor
6
power
system
2.5-second OFF
Operation Indicator
MXZ type
Operation
7
mode
2.5-second OFF
Lighted
setting
Flashing
The indication is shown only when the indoor unit connects with the outdoor unit MXZ type.
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Symptom
Outdoor unit
does not run.
Outdoor unit
does not run.
Indoor unit
does not run
Outdoor unit
does not run
2.5-second OFF
Outdoor unit
does not run
2.5-second OFF
Outdoor unit
does not run
Outdoor unit
operates but
indoor unit does
not operate.
13
Detect method
Check wiring (visual check and conductiv-
ity check).
When serial signal stops for 4
Check indoor electronic control
to 5 seconds.
P.C.board.
Check outdoor deicer P.C. board.
Check electrical parts.
Detect Indoor coil/room tem-
Check resistance of thermistor.
perature thermistor short or
Reconnect connector.
open circuit every 8 seconds
Check indoor electronic control P.C.
during operation.
board.
When it cannot properly read
Check indoor electronic control P.C.
data in the nonvolatile memory
of the indoor electronic control board.
P.C. board.
Check outdoor deicer P.C. board.
Check resistance of thermistor.
When the outdoor thermistors
Reconnect connector.
short or open after the
Refer to service manual OB381 or
compressor start-up.
OB319 REVISED EDITION-A.
When it cannot properly read
Check the outdoor deicer P.C. board or
data in the nonvolatile
outdoor electronic control P.C. board.
memory of the outdoor deicer
Refer to service manual OB381 or
P.C. board or outdoor
OB319 REVISED EDITION-A.
electronic control P.C. board.
When the compressor
Check the inverter output.
operation is continuously
three times interrupted by Check the compressor.
over current protection within Refer to service manual OB319
1 minute after start-up , it REVISED EDITION-A.
stops operation.
When the operation mode of
each indoor unit is differently
Unify the operation mode.
set to COOL(includes DRY)
and HEAT at same time, the Refer to service manual OB319
operation mode of indoor unit REVISED EDITION-A.
that has operated at first has
the priority.
Check point