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