Fujitsu AB*30LBAG series, Service Instruction

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Trouble shooting 18
OUTDOOR UNIT Error Method:
Indicate or Display:
Indoor Unit : No LED
Outdoor Unit : LED 8 Times Blink
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
OK OK
OK OK
TH
E
R
M
IS
TO
R
(D
IS
C
H
A
R
G
E
)
TH
E
R
M
IS
TO
R
(P
IP
E
)
TH
E
R
M
IS
TO
R
(O
U
TD
O
O
R
)
TH
E
R
M
IS
TO
R
(C
O
M
P
R
E
S
S
O
R
)
TH
ER
M
IS
TO
R
(H
EA
T
SI
N
K
)
B
R
O
W
N
B
LA
C
K
B
LA
C
K
B
LU
E
B
R
O
W
N
CN21 CN22 CN23 CN26 CN25
1 2 1 2 1 2 1 2 1 2
30°C
6.10 9.73 12.4 16.1 Resistance Value (k )
20°C
7.67
15°C 10°C 5°C 0°C
Temperature
1.79
1.25 0.89 Resistance Value (k )
50°C
60°C 70°C
0.65
80°C
0.48
90°C
0.36
100°C
0.27
110°C
0.21
120°C
2.62 3.95
40°C
Temperature
Heat Sink Temperature Sensor Error
Outdoor Unit Main PCB Circuit
Heat Sink Temperature Thermistor
When Heat Sink Temperature Thermistor open or short-circuit is
detected at power ON or while running the compressor.
1. Connector connection failure 2.Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>>Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
07-19