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5103 Gas pipe temperature thermistor (TH23)
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
due to detecting abnormality. In this time,
<5103> is displayed. Then, if the
thermistor recover in 3 minutes, 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
Pipe temperature / judging defrost
thermistor (TH3)
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.
1) Connector (TH3) contact failure Check whether the connector (TH3)
in the multi controller board is
connected or not.
When controller detects short/open in
thermistor at just before of restarting, the
unit stops due to detecting abnormality. In
this time, <5105> is displayed.
2) Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
3) Thermistor failure Check the resistance of thermistor.
When the resistance is not below
value, replace the thermistor.
0;····15k'
For 10 minutes after starting compressor,
for defrosting or for 3 minutes 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.
-42.5: Open
91.9: Short
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Display
Abnormal point and detecting method
Causes
Check points
on
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OC376B--2.qxp 08.1.17 1:15 PM Page 43