Fujitsu ASU18RLF Service Instructions Manual page 68

Split type room air conditioner compact wall mounted / wall mounted / floor compact cassette / slim duct inverter multi
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Trouble shooting 23
OUTDOOR UNIT Error Method:
Outdoor Thermister Error
Detective Actuators:
Outdoor unit main PCB circuit
Outdoor temperature thermistor
Forecast of Cause:
1. Connector connection failure 2.Thermistor failure 3. Main PCB failure
Test 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 miss-wiring, reset the power.
OK
Test 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Approx. value)
Temperature (°C)
Temperature (°F)
Resistance Value (k )
Temperature (°C)
Temperature (°F)
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
Test 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)
BLACK
1
1
CN61
2
2
BLACK
3 3
1
1
BLACK
CN62
2
2
BLACK
3 3
BLACK
1
1
BLACK
2
2
CN63
BLACK
3 3
BLACK
4 4
If the voltage does not appear, replace Main PCB.
Indicate of Display:
Indoor Unit
Operation lamp : 7 time Flash
Timer lamp
ERROR CODE : [E : 74]
Detective details:
When Outdoor temperarture thermistor open or short-circuit is detected
at power ON or while running the compressor.
-30
-20
-10
0
-22
-4
32
14
224.33
115.24
62.28
35.21
60
70
80
140
158
176
2.36
1.65
1.18
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( HEX OUT TEMP. )
THERMISTOR
( DISCHARGE TEMP. )
THERMISTOR
( COMP TEMP. )
02-28
Outdoor Unit
A
: 4 time Flash
7
: Light ON
10
20
30
50
68
86
20.72
12.64
7.97
Monitor
B
C
D
E
F
4
: Light OFF
n : n time blinking
40
50
104
122
5.18
3.45

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