Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 41

Display
Meaning and detecting method
5103 Gas pipe temperature thermistor (TH23)
abnormality
When the thermistor detects short/open
after 3 minutes-continuous thermo ON
during cooling or dry operation, the
operation stops and the operation
changes to protect mode of restarting in
3 minutes. If the thermistor does not
recover in 3 minutes, the operation stops
abnormally. In this time, <5103> is
displayed. Then, if the thermistor recover
in 3 minutes, it operates normally.
Short: Detected 90; or more
Open: Detected -40; or less
5105
Pipe temperature / judging defrost thermistor
(TH3) abnormality
1
When controller detects short/open in
thermistor during the operation, the outdoor
unit stops once and restarts operation in
3 minutes. When the detected temperature
is normal at just before of restarting, the
outdoor unit restarts.
2
When controller detects short/open in
thermistor at just before of restarting, the
unit stops abnormally. In this time, <5105>
is displayed.
3
For 10 minutes after starting compressor,
for defrosting or for 3 minutes after recover
of defrosting, above-mentioned short/open
are not detected.
Short: 88; or more (0.4k')
Open: -39; or less (115k')
Causes
1) Connector (CN29) contact failure
2) Thermistor wiring disconnection or
half disconnection
3) Thermistor failure
4) Detecting circuit failure in the indoor
controller board
1) Connector (TH3) contact failure
2) Thermistor wiring disconnection or
half disconnection
3) Thermistor failure
4) Multi controller board input circuit
failure
41
Check points
1
Check whether the connector (CN29)
in the indoor controller board is
connected or not.
2
Check whether the thermistor wiring
is disconnected or not.
3 Check the resistance of thermistor;
0;····15k'
10;···9.6k'
20;···6.3k'
30;···4.3k'
40;···3.0k'
4
When there is no problem in above
mentioned 123,replace the indoor
controller board.
1
Check whether the connector (TH3)
in the multi controller board is
connected or not.
2
Check whether the thermistor wiring
is disconnected or not.
3 Check the resistance of thermistor;
When the resistance is not below
value, replace the thermistor.
0;····15k'
10;···9.6k'
20;···6.3k'
30;···4.3k'
40;···3.0k'
1 3 4 5 6 7 8 2
on
4
Set the SW1 to
When the temperature in multi
controller board is not an actual
temperature, replace the multi
controller board.
-42.5: Open
91.9: Short