42
5102
Liquid pipe temperature thermistor
(TH22)
When the thermistor detects short/open
during the 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, <5102> is
displayed. Then, if the thermistor recover
in 3 minutes, it operates normally.
1) Connector (CN21) contact failure
Check whether the connector
(CN21) 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°C or more
3) Thermistor failure
Open: Detected -40°C or less
Check the resistance of thermistor.
4) Detecting circuit failure in the
indoor controller board
When there is no problem in above
mentioned
, replace the indoor
controller board.
Low pressure saturation temperature
thermistor (TH6)
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 (TH6) contact failure
Check whether the connector (TH6)
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, <5102> 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.
For 10 minutes after starting compressor in
heating mode, above-mentioned short/open
are not detected.
Short: 90°C or more
Open: -40°C or less
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
0°C····15k
10°C···9.6k
20°C···6.3k
30°C···4.3k
40°C···3.0k
0°C····15k
10°C···9.6k
20°C···6.3k
30°C···4.3k
40°C···3.0k
Display
Abnormal point and detecting method
Causes
Check points
on
2
1 3 4 5 6 7 8
