lighted 2.5-second OFF
flashing
Operation Indicator
55
1. Troubleshooting check table
MSH-18RV
• The following indication does not depend on the shape of lamp.
Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
NO.
1
2
3
4
Abnormal
point
Mis-wiring
Serial sig-
nal
Indoor coil
thermistor
Room
tempera-
ture ther-
mistor
Indoor fan
motor
Defrost
thermistor
Indication
0.5-second ON
0.5-second OFF
1-time flash
2.5-second OFF
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
6-time flash
2.5-second OFF
Symptom
Outdoor unit
does not run.
Outdoor unit
does not run.
Indoor fan motor
repeats 12 sec-
onds ON and 3
minutes OFF.
When the indoor
fan breaks, the
fan motor keeps
stopping.
Outdoor unit
does not run
Detect method
When serial signal stops for 4
to 5 seconds after 1st on of
52C relay by POWER turning
on.
When serial signal from out-
door unit stops for 4 to 5 sec-
onds.
Detect Indoor coil/room tem-
perature thermistor short or
open circuit every 8 seconds
during operation.
When rotational frequency
feedback signal is not emit
during 12-second indoor fan
operation.
When the defrost thermistor
shorts or opens after the com-
pressor 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.
●
Re-connect connector.
●
Check indoor electronic control P.C.board.
●
Disconnect connector CN211 and then
check connector CN121 - to make
sure rotational frequency feedback signal
of 1.5V or over exists.
●
Check indoor electronic control P.C.
board.
●
Check indoor fan motor.
●
Re-connect connector.
●
Check outdoor DEICER P.C. board.
●
Check resistance of thermistor.
●
Re-connect connector.
2
3
5
Outdoor
power
system
5-time flash
2.5-second OFF
Outdoor unit
does not run
When the compressor opera-
tion 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.
6
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 control
P.C.board.
●
Check the outdoor control P.C.board.
7
Outdoor
refrigerant
system
error
MXZ-32NV
MXZ-32RV
10-time flash
2.5-second OFF
Outdoor unit
does not run
When the compressor opera-
tion has been interrupted by
LEV protection continuously 5
minutes, the compressor stops
operation.
●
Amount of gas.
●
Check the outdoor control P.C. board.
●
Contact of LEV board connectors.
8
Outdoor
control
P.C. board
Outdoor unit
runs but the
indoor unit does
not run.
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.
❈
❈
❈
❈
❈
The indication is shown only when the indoor unit connects with the outdoor unit MXZ-32NV-
, ,
MXZ-32RV-
and MXZ-32SV-
E1
E1
E2
E1
Operation Indicator
· Flashing of the OPERATION INDICATOR lamp (on the left-hand side)
indicates possible abnormalities.
· The OPERATION INDICATOR lamp (on the left-hand side) is lighting during
normal operation.
flashing
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