Fujitsu AU G18LVLB Series Service Instruction page 62
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Also See for AU G18LVLB Series:
- Design & technical manual (253 pages) ,
- Service instruction (70 pages) ,
- Service instruction (122 pages)
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Trouble shooting 18
INDOOR UNIT Error Method:
Indoor Room Thermistor Error
Detective Actuators:
Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor
Forecast of Cause : 1. Connector failure connection
Check Point 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics(Rough value)
Temperature
(°C )
Resistance value (k )
Temperature
(°C )
Resistance value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check Voltage of Controller PCB (DC 5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
BLACK
1
1
CN8
BLACK
2
2
BLACK
1
1
CN6
2
2
BLACK
3
3
If the voltage does not appear, replace Controller PCB and execute the check operation again.
Indicate or Display:
Indoor Unit : Operation lamp: 4 time Flash,
Timer lamp: 1 time Flash
Economy lamp : Continuous flash.
ERROR CODE : [E : 41]
Detective details:
Indoor unit thermistor is open or short is detected always.
2. Thermistor failure 3. Controller PCB failure
0
5
10
33.6
25.9
20.2
40
45
50
5.3
4.4
3.6
Room Temp. Thermistor
H/E Thermistor
15
20
25
15.8
12.5
10.0
02-23
Outdoor unit :
PUMP
LOW
POWER
DOWN
NOISE
ERROR
(L1)
(L2)
(L3)
(L4)
MODE
5
15
2
30
35
8.0
6.5
DC
PEAK
CUT
(L5)
(L6)
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Troubleshooting
