Fujitsu AUG12LVLB Service Instruction page 49

Floor ceiling/slim duct/cassette type, inverter
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Trouble shooting 14
OUTDOOR UNIT Error Method:
Discharge temp. sensor error
Detective Actuators:
Outdoor unit Main PCB
Discharge pipe temperature thermistor
Forecast of Cause :
1. Connector connection 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.
OK
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Check Point 2 :
Thermistor Characteristics (Approx. 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
OK
Check Point 3 :
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)
1 2 3
1 2 3
CN70
If the voltage does not appear, replace Main PCB.
AMP Air Conditioning
Indicate or Display:
Refer to error code table.
Detective details:
When the discharge pipe temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
2.Thermistor failure
-30
-20
-10
1013.1 531.6 292.9 168.6
60
70
80
12.3
8.7
6.3
1 2
1 2
1 2 3 4
1 2
1 2
1 2 3 4
CN72
CN73
CN71
3. Main PCB failure
0
10
20
30
100.9
62.5
40.0
90
100
110
120
4.6
3.4
2.6
2.0
www.ampair.co.uk | sales@ampair.co.uk
02-16
40
50
26.3
17.8

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