Fujitsu ASU18RLF Service Manual

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.
Test 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
OK
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)
If the voltage does not appear, replace Main PCB.
CN61
CN62
1
2
1
2
33
1
2
1
2
33
BLACK
BLACK
CN63
1
2
1
2
33
44
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
THERMISTOR
( HEX OUT TEMP. )
THERMISTOR
( DISCHARGE TEMP. )
THERMISTOR
( COMP TEMP. )
THERMISTOR
( OUTDOOR TEMP. )
Trouble shooting 21
OUTDOOR UNIT Error Method:
Compressor Thermister Error
Outdoor unit main PCB circuit
Compressor temperature thermistor
When Compressor temperarture thermistor open or short-circuit is detected
at power ON or while running the compressor.
Detective Actuators:
Detective details:
Indicate of Display:
Forecast of Cause:
02-26
6.27
176
8.70
158
12.30
26.3440.0162.55100.91168.60
Resistance Value
(k )
140
1048668
50
807060
40
17.79
122
503020
10
32
0
292.91531.561013.11
14
-4
-10
-20
-22
-30
Temperature (°F)
Temperature (°C)
3.434.60
Resistance Value
(k )
212 230
2.60
194
100 110
248
2.00
12090
Temperature (°F)
Temperature (°C)
Indoor Unit
Outdoor Unit
Operation lamp : 7 time Flash
ERROR CODE : [E : 72]
Timer lamp: 2 time Flash
Monitor
ABCDEF
7
: Light ON : Light OFF n : n time blinking
2

Fujitsu ASU18RLF Specifications

General

Brand	Fujitsu
Model	ASU18RLF
Category	Air Conditioner
Language	English