Fujitsu AUG12LVLB - Discharge temp. sensor error (Outdoor Unit)

Trouble shooting 14
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
OKOK
OKOK
Discharge temp. sensor error
Outdoor unit Main PCB
Discharge pipe temperature thermistor
When the discharge pipe 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
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.
02-16
THERMISTOR (DISCHARGE)
THERMISTOR (PIPE MID) THERMISTOR (PIPE) THERMISTOR (COMP) THERMISTOR (OUTDOOR)
BLACK BLACK BLACK
CN70 CN72 CN73 CN71
1 2 3 4
1 2 3 4
1 2 3
1 2 3
Refer to error code table.
BROWN BROWN
Thermistor Characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Resistance Value (k )
Temperature(°C)
Resistance Value (k )
Temperature(°C)
-30 -20 -10 0 10 20 30 40 50
60 70 80 90 100 110 120
1013.1 531.6 292.9 168.6 100.9 62.5 40.0 26.3 17.8
12.3 8.7 6.3 4.6 3.4 2.6 2.0
1 2
1 2
1 2
1 2
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