Mitsubishi MCFH-13NV Service Manual page 44

11-2-1. troubleshooting check table
OPERATION
INDICATOR
lamp
Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
Self check table
Abnormal
NO.
point
0.5-second ON
Mis-wiring
0.5-second OFF
1
1-time flash
Serial sig-
nal
2.5-second OFF
Indoor coil
2-time flash
thermistor
2
Room
tempera-
ture ther- 2.5-second OFF
mistor
6-time flash
Defrost
3
thermistor
5-time flash
Outdoor
4
power
system
7-time flash
Outdoor
control
5
P.C. board
MCFH-
24NV only
10-time flash
Outdoor
refrigerant
6
system
error
The indication is shown only when the indoor unit connects with the outdoor unit MXZ-32SV-
Indication
Outdoor unit
does not run.
Outdoor 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
2.5-second OFF
Outdoor unit
does not run
2.5-second OFF
Symptom Detect method
When serial signal stops for 4
to 5 seconds after 1st on of
52C contactor 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 the defrost thermistor
shorts or opens after the com-
pressor start-up.
When the compressor opera-
tion is continuously three times
interrupted by over current
protection within 1 minute after
start-up , it stops operation.
When it cannot properly read
data in the nonvolatile memory
of the outdoor control
P.C.board.
When the compressor opera-
tion has been interrupted by
LEV protection continuously 5
minutes, the compressor stops
operation.
.
E1
44
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.
Check outdoor DEICER P.C. board.
Check resistance of thermistor.
Re-connect connector.
Check the inverter output.
Check the compressor.
Check the outdoor control P.C.board.
Amount of gas.
Check the outdoor control P.C. board.
Contact of LEV board connectors.