Fujitsu ASYG07KMTA Service Manual page 79

Trouble shooting 15
OUTDOOR UNIT Error Method:
Discharge Thermistor 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
Resistance Value (k )
Temperature
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)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(OUTDOOR)
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 71 ]
Detective details:
When Discharge pipe temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
2.Thermistor failure
-30°C -20°C -10°C
1013.1 531.6 292.9
40°C 50°C 60°C
26.3 17.8 12.3
BLACK
1 1
BLACK
2 2
P1
BLACK
3 3
BLACK
4 4
BLACK
1 1
P5
2 2
BLACK
3 3
: Operation lamp: 7 time Flash, Timer lamp: 1 time Flash
Economy lamp: Continuous flash.
3. Main PCB failure
-5°C 0°C 5°C 10°C
221.1 168.6 129.8 100.9
70°C 80°C 90°C 100°C
8.7 6.3 4.6
02-18
20°C 30°C
40.0
62.5
110°C 120°C
3.4 2.6 2.0