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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 [194°F] or more
Thermistor failure
Check the resistance of thermistor;
Open: Detected –40 [-40°F] or less
0 [32°F]····· 15k
10 [50°F]····· 9.6k
20 [68°F]····· 6.3k
30 [86°F]····· 4.3k
40 [104°F]··· 3.0k
Detecting circuit failure in the
indoor controller board
When there is no problem in above
mentioned , replace the indoor
controller board.
Discharge/Compressor 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 [32°F]····· about 700k
10 [50°F]····· about 410k
20 [68°F]····· about 250k
30 [86°F]····· about 160k
40 [104°F]··· 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 [421°F] or more (1k)
Open: 0 [32°F] or less (700k)
Note) When outer temperature thermistor
(TH7) is 5 [41°F] 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
(2) Compressor overcurrent interruption
Abnormal if overcurrent DC bus or
compressor is detected after compressor
starts operating for 30 seconds.
Over current : 27.5A
Outdoor fan motor
Abnormal if rotational frequency of the fan
motor is not detected during DC fan motor
operation.
Fan motor rotational frequency is abnormal if;
• 100 rpm or below detected continuously
for 15 seconds at 20 [68°F]: or more
outside air temperature
• 50 rpm or below or 1500 rpm or more
detected continuously for 1 minute.
Stop valve of outdoor unit is closed.
Decrease of power supply voltage
Looseness, disconnection or converse
of compressor wiring connection
Defective fan of indoor/outdoor units
Short cycle of indoor/outdoor units
Defective input circuit of outdoor
controller board
Defective compressor
Failure in the operation of the DC fan motor
Failure in the outdoor circuit controller board
Open stop valve.
Check facility of power supply.
Correct the wiring (U·V·W phase) to
compressor.
(Outdoor power circuit board)
Check indoor/outdoor fan.
Solve short cycle.
Replace outdoor controller circuit board.
Check compressor
Before the replacement of the outdoor
controller circuit board, disconnect the
wiring to compressor from the outdoor
power circuit board and check the output
voltage among phases, U, V, W, during
test run (SW7-1 ON). No defect on board
if voltage among phases (U-V, V-W and
W-U) is same. Make sure to perform the
voltage check with same performing
frequency.
Check or replace the DC fan motor.
Check the voltage of the outdoor circuit
controller board during operation.
Replace the outdoor circuit contrlooer
board. (when the failure is still indicated
even after performing the remedy 1
above.)
4250
4400
on
21345678
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