41
5101
Display
Abnormal point and detecting method
Causes
Check points
Room temperature thermistor (TH21)
When controller detects short (high
temp.)/open (low temp.) in thermistor
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, <5101> is
displayed. Then, if the thermistor recover
in 3 minutes, it operates normally.
Connector (CN20) contact failure
Check whether the connector
(CN20) in the indoor controller board
is connected or not.
Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
Short: Detected 90°C or more
Thermistor failure
Check the resistance of thermistor.
Open: Detected –40°C or less
0°C···15k
10°C···9.6k
20°C···6.3k
30°C···4.3k
40°C···3.0k
Detecting circuit failure in the
indoor controller board
When there is no problem in above
mentioned
, replace the indoor
controller board.
Discharge temperature thermistor (TH4)
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.
Connector (TH4) contact failure
Check whether the connector (TH4)
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, <5101> is displayed.
Thermistor wiring disconnection or
half disconnection
Check whether the thermistor wiring
is disconnected or not.
Thermistor failure
Check the resistance of thermistor.
When the resistance is not below
value, replace the thermistor.
0°C··· about 700k
10°C··· about 410k
20°C··· about 250k
30°C··· about 160k
40°C··· about 104k
For 10 minutes after starting compressor,
for defrosting or for 3 minutes after recover
of defrosting, above-mentioned short/open
are not detected.
Short: 216°Cor more (1k
)
Open: 0°C or less (700k
)
Note) When outdoor temperature
thermistor (TH7) is 5°C or less on cooling,
open detecting is not determined as
abnormality.
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.
1.3: Open
219.4: Short
on
2
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