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5106
Outdoor temperature thermistor (TH7)
Display
Abnormal point and detecting method
Causes
Check points
1) Connector (TH7) contact failure Check whether the connector (TH7)
in the multi controller board is
connected or not.
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) Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
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.
3) Thermistor failure Check the resistance of thermistor.
When the resistance is not below
value, replace the thermistor.
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
0;····15k'
10;···9.6k'
20;···6.3k'
30;···4.3k'
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.
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:102; or more
Open: -27; or less
1
2
3
1
2
3
1
2
3
4
-42.5: Open
91.9: Short
on
21345678
1) Connector (TH8) contact failure
2) Thermistor wiring disconnection or
half disconnection
3) Thermistor failure
4) Power board input circuit failure
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
4
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
2
3
on
21345678
OC376B--2.qxp 08.1.17 1:15 PM Page 44