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Abnormal point and detecting method
5106
Outdoor temperature thermistor (TH7)
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.
When controller detects short/open in
thermistor at just before of restarting, the
unit stops due to detecting abnormality. In
this time, <5106> is displayed.
For 10 minutes after starting compressor,
for defrosting or for 3 minutes after recover
of defrosting, above-mentioned short/open
are not detected.
Short: 90
or more
Open: -40
or less
5110
Heatsink temperature thermistor (TH8)
(internal thermistor of power module)
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.
When controller detects short/open in
thermistor at just before of restarting, the
unit stops due to detecting abnormality. In
this time, <5110> is displayed.
For 10 minutes after starting compressor,
for defrosting or for 3 minutes after recover
of defrosting, above-mentioned short/open
are not detected.
Short:170
or more
Open: -35
or less
Causes
1) Connector (TH7) contact failure
2) Thermistor wiring disconnection or
half disconnection
3) Thermistor failure
4) Multi controller board input circuit
failure
1) Connector (TH8) contact failure.
2) Thermistor wiring disconnection or
half disconnection.
3) Thermistor failure
4) Power board input circuit failure
44
Check points
Check whether the connector (TH7)
in the multi controller board is
connected or not.
Check whether the thermistor wiring
is disconnected or not.
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
Set the SW1 to
on
When the temperature in multi
controller board is not an actual
temperature, replace the multi
controller board.
-42.5: Open
91.9: Short
Check whether the connector (TH8) in
the power circuit board.
Check whether the thermistor wiring
is disconnected or not.
Check the resistance of thermistor;
When the resistance is not below
value, replace the thermistor.
0
·····180k
10
·····105k
20
·······63k
30
·······39k
40
·······25k
1 3 4 5 6 7 8
2
on
Set the SW1 to
When the temperature in multi
controller board is not an actual
temperature, replace the power
board.
-81.0: Open
999.9: Short
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