Mitsubishi PUMY-71VM

72
5103 Gas pipe temperature thermistor (TH23)
abnormality
When the thermistor detects short/open
after 3minutes-continuous thermostat ON
during cooling or dry operation, the
operation stops and the operation
changes to protect mode of restarting in
3minutes. If the thermistor does not
recover in 3minutes, the the operation
stops abnormally. In this time, <5103> is
displayed. Then, if the thermistor recover
in 3minutes, it operates normally.
1) Connector (CN29) contact failure Check whether the connector (CN29)
in the indoor controller board is
connected or not.
2) Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
Short: Detected 90; or more
3) Thermistor failure Check the resistance of thermistor;
Open: Detected -40; or less
0;···15k'
10;···9.6k'
20;···6.3k'
30;···4.3k'
40;···3.0k'
4) Detecting circuit failure in the indoor
controller board
When there is no problem in above
mentioned 123,replace the indoor
controller board.
5105
Paipe temperature / judging defrost
thermistor (TH5) abnormality
When controller detects short/open in
thermistor during the operation, the outdoor
unit stops once and restarts operation in
3minutes. When the detected temperature
is normal just before restarting, the outdoor
unit restarts.
1) Connector (TH5) contact failure Check whether the connector (TH5)
in the multi controller board is
connected or not.
When controller detects short/open in
thermistor at just before of restarting, the
unit stops abnormally. In this time, <5105>
is displayed.
2) Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
While the compressor is protected not to
restart in 3minutes, the unit is delayed
abnormal stop. Then, the outdoor unit
address No. and check delay code <1205>
blinks alternately on the 4 digit digital
display.
3) Thermistor failure Check the resistance of thermistor;
When the resistance is not below
value, replace the thermistor.
SW1 setting
0;···15k'
For 10 minutes after starting compressor,
for defrosting or for 3minutes after recover
of defrosting, above-mentioned short/open
are not detected.
10;···9.6k'
20;···6.3k'
Short: 88; or more (0.4k')
30;···4.3k'
Open: -39; or less (115k')
40;···3.0k'
4) Multi controller board input circuit
failure
Set the SW1 to
When the temperature in multi
controller board is not an actual
temperature, replace the multi
controller board.
-99.9: Open
999.9: Short
1
2
3
4
1
2
3
4
1
2
3
4
Display
Meaning and detecting method
Causes
Check points
on
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on
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